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Journal articles on the topic 'Low-temperature catalytical oxidation'

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Author: Grafiati

Published: 30 May 2022

Last updated: 31 May 2022

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1

Mohapatra, P., T. Mishra, and K. M. Parida. "Pillared Clay as an Effective Catalyst for Low Temperature VOCs Decomposition." Key Engineering Materials 571 (July 2013): 71–91. http://dx.doi.org/10.4028/www.scientific.net/kem.571.71.

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Volatile organic compounds (VOCs) are organic chemicals mostly emitted from different sources like industrial or domestic having high vapor pressure at room-temperature conditions. Some of these are also anthropogenic in nature and also these are the major contributor for the photochemical ozone. The different methods available for the abatement of VOCs are thermal oxidation, catalytic oxidation, photocatalytic oxidation, adsorption etc. Due to the stringent regulation of VOCs emission in different countries there is a need of efficient abatement technology to preserve the environment. In this context catalytic combustion of organic pollutants offers considerable advantages over the industrially operated thermal combustion process. Generally, oxidative destruction is possible at low temperature in presence of a catalyst. In addition catalytic process is more energy efficient and can operate with very dilute pollutants. A number of catalysts have been used for the complete oxidation of VOCs, among these Pillared clays type porous materials are also useful for the purpose. Pillared clays have high surface area, pore volume, thermal stability and can be tailor made for particular catalytic application compared with the parent clays. In the present review we will summarize the latest developments on the clay based materials including the effect of different controlling parameters for the synthesis of pillared clay based porous materials and its specific application for the low temperature VOCs decomposition. In particular the effect of transition metals like iron and manganese oxide pillared clay on the VOC decomposition is discussed.

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2

Uzair, Bushra, Ayesha Liaqat, Haroon Iqbal, Bouzid Menaa, Anam Razzaq, Gobika Thiripuranathar, Nosheen Fatima Rana, and Farid Menaa. "Green and Cost-Effective Synthesis of Metallic Nanoparticles by Algae: Safe Methods for Translational Medicine." Bioengineering 7, no. 4 (October 16, 2020): 129. http://dx.doi.org/10.3390/bioengineering7040129.

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Metal nanoparticles (NPs) have received much attention for potential applications in medicine (mainly in oncology, radiology and infectiology), due to their intriguing chemical, electronical, catalytical, and optical properties such as surface plasmon resonance (SPR) effect. They also offer ease in controlled synthesis and surface modification (e.g., tailored properties conferred by capping/protecting agents including N-, P-, COOH-, SH-containing molecules and polymers such as thiol, disulfide, ammonium, amine, and multidentate carboxylate), which allows (i) tuning their size and shape (e.g., star-shaped and/or branched) (ii) improving their stability, monodispersity, chemical miscibility, and activity, (iii) avoiding their aggregation and oxidation over time, (iv) increasing their yield and purity. The bottom-up approach, where the metal ions are reduced in the NPs grown in the presence of capping ligands, has been widely used compared to the top-down approach. Besides the physical and chemical synthesis methods, the biological method is gaining much consideration. Indeed, several drawbacks have been reported for the synthesis of NPs via physical (e.g., irradiation, ultrasonication) and chemical (e.g., electrochemisty, reduction by chemicals such as trisodium citrate or ascorbic acid) methods (e.g., cost, and/ortoxicity due to use of hazardous solvents, low production rate, use of huge amount of energy). However, (organic or inorganic) eco-friendly NPs synthesis exhibits a sustainable, safe, and economical solution. Thereby, a relatively new trend for fast and valuable NPs synthesis from (live or dead) algae (i.e., microalgae, macroalgae and cyanobacteria) has been observed, especially because of its massive presence on the Earth’s crust and their unique properties (e.g., capacity to accumulate and reduce metallic ions, fast propagation). This article discusses the algal-mediated synthesis methods (either intracellularly or extracellularly) of inorganic NPs with special emphasis on the noblest metals, i.e., silver (Ag)- and gold (Au)-derived NPs. The key factors (e.g., pH, temperature, reaction time) that affect their biosynthesis process, stability, size, and shape are highlighted. Eventually, underlying molecular mechanisms, nanotoxicity and examples of major biomedical applications of these algal-derived NPs are presented.

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3

Pak, Daewon, and Wonseok Chang. "Decolorizing Dye Wastewater with Low Temperature Catalytic Oxidation." Water Science and Technology 40, no. 4-5 (August 1, 1999): 115–21. http://dx.doi.org/10.2166/wst.1999.0582.

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Novel oxidation technology to decolorize dye wastewater was discussed and the feasibility of color removal with Fe/MgO catalyst fluidizing in a reactor under continuous flow was demonstrated at room temperature. In batch tests, the oxidation reaction of reactive and disperse dye with an oxidizing agent, hydrogen peroxide, in the presence of Fe/MgO catalyst was performed. Through the catalytic oxidation, dyes were oxidized to molecules with lower molecular weight and then mineralized based on TOC analysis. The influence of hydrogen peroxide and catalyst dosage on the catalytic oxidation rate was verified. The catalytic oxidation rate increased with increasing hydrogen peroxide and catalyst dosage. Fe/MgO catalyst fluidizing in the reactor operated at room temperature was tested to decolorize the wastewater from a dye manufacturing industry. In the fluidized bed reactor, the wastewater was completely decolorized and about 30% of COD removal was obtained during 30 days of operation. Organic matters were degraded and part of them mineralized by the catalytic oxidation. BOD/COD ratio of the effluent from the fluidized bed reactor was increased compared to that of the influent. After 30 days of operation, the effluent from the fluidized bed reactor started becoming yellowish. COD and residual hydrogen peroxide concentration in the effluent started to increase due to the catalyst losing its activity.

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4

Jin, Lei, and Martin A. Abraham. "Low-temperature catalytic oxidation of 1,4-dichlorobenzene." Industrial & Engineering Chemistry Research 30, no. 1 (January 1991): 89–95. http://dx.doi.org/10.1021/ie00049a013.

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5

Wang, Jian, Hainan Zhao, Jianfei Song, Tingyu Zhu, and Wenqing Xu. "Structure-Activity Relationship of Manganese Oxide Catalysts for the Catalytic Oxidation of (chloro)-VOCs." Catalysts 9, no. 9 (August 28, 2019): 726. http://dx.doi.org/10.3390/catal9090726.

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Manganese oxide catalysts, including γ-MnO2, Mn2O3 and Mn3O4, were synthesized by a precipitation method using different precipitants and calcination temperatures. The catalytic oxidations of benzene and 1,2-dichloroethane (1,2-DCE) were then carried out. The effects of the calcination temperature on the catalyst morphology and activity were investigated. It was found that the specific surface area and reducibility of the catalysts decreased with the increase in the calcination temperature, and both the γ-MnO2 and Mn3O4 were converted to Mn2O3. These catalysts showed good activity and selectivity for the benzene and 1,2-DCE oxidation. The γ-MnO2 exhibited the highest activity, followed by the Mn2O3 and Mn3O4. The high activity could be associated with the large specific surface area, abundant surface oxygen species and excellent low-temperature reducibility. Additionally, the catalysts were inevitably chlorinated during the 1,2-DCE oxidation, and a decrease in the catalytic activity was observed. It suggested that a higher reaction temperature could facilitate the removal of the chlorine species. However, the reduction of the catalytic reaction interface was irreversible.

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6

Święs, Aneta, Andrzej Kowalczyk, Małgorzata Rutkowska, Urbano Díaz, Antonio E. Palomares, and Lucjan Chmielarz. "Ferrierite and Its Delaminated and Silica-Intercalated Forms Modified with Copper as Effective Catalysts for NH3-SCR Process." Catalysts 10, no. 7 (July 2, 2020): 734. http://dx.doi.org/10.3390/catal10070734.

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The main goal of the study was the development of effective catalysts for the low-temperature selective catalytic reduction of NO with ammonia (NH3-SCR), based on ferrierite (FER) and its delaminated (ITQ-6) and silica-intercalated (ITQ-36) forms modified with copper. The copper exchange zeolitic samples, with the intended framework Si/Al ratio of 30 and 50, were synthetized and characterized with respect to their chemical composition (ICP-OES), structure (XRD), texture (low-temperature N2 adsorption), form and aggregation of deposited copper species (UV-vis-DRS), surface acidity (NH3-TPD) and reducibility (H2-TPR). The samples of the Cu-ITQ-6 and Cu-ITQ-36 series were found to be significantly more active NH3-SCR catalysts compared to Cu-FER. The activity of these catalysts in low-temperature NH3-SCR was assigned to the significant contribution of highly dispersed copper species (monomeric cations and small oligomeric species) catalytically active in the oxidation of NO to NO2, which is necessary for fast-SCR. The zeolitic catalysts, with the higher framework alumina content, were more effective in high-temperature NH3-SCR due to their limited catalytic activity in the side reaction of ammonia oxidation.

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7

Mo Thi Nguyen, Mo Thi Nguyen, Cam Minh Le Cam Minh Le, Tuan Minh Nguyen Tuan Minh Nguyen, Hao Hoang Nguyen Hao Hoang Nguyen, and Anwar ul Haq Ali Shah Hung Van Hoang Anwar ul Haq Ali Shah Hung Van Hoang. "Synthesis and Characterization of CuMnOx-Bentonite as Efficient Catalyst for Oxidation of m-xylene." Journal of the chemical society of pakistan 42, no. 4 (2020): 504. http://dx.doi.org/10.52568/000666.

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Catalytic oxidation of organic volatile compounds (VOCs) is considered superior to conventional methods because very low concentration of VOCs can also be oxidized and removed at low temperatures without consumption of addditional fuel and introduction of NOx compounds into the environment. Herein, the synthesis of MnO2 nanoparticles on bentonite (Bent) support in the presence of CuO for catalytic oxidation of m-xylene is reported. The synthesized materials were analyzed with FT-IR, XRD, and TEM analysis for structural and morphological characterization. XRD and TEM analysis indicated the formation of δ-MnO2 with sheet structure on Bent surface. Temperature-programmed reduction (H2-TPR) of hydrogen was used to investigate catalytic performance of δ-MnO2 towards oxidation of m-xylene at different temperatures. The catalytic activity was strongly dependent on the δ-MnO2 content in the synthesized material. 100 % oxidation of m-xylene with observed with 10% Mn content at temperature below than 325 oC. Intersetingly introduction of CuO greatly improved the catalytic activity of Mn-Bent materials. The presence of Cu in Mn-Bent has greatly reduced the temperature for complete oxidation of m-xylene. In this case100% conversion of m-xylene was observed at 250 oC.

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8

Mo Thi Nguyen, Mo Thi Nguyen, Cam Minh Le Cam Minh Le, Tuan Minh Nguyen Tuan Minh Nguyen, Hao Hoang Nguyen Hao Hoang Nguyen, and Anwar ul Haq Ali Shah Hung Van Hoang Anwar ul Haq Ali Shah Hung Van Hoang. "Synthesis and Characterization of CuMnOx-Bentonite as Efficient Catalyst for Oxidation of m-xylene." Journal of the chemical society of pakistan 42, no. 4 (2020): 504. http://dx.doi.org/10.52568/000666/jcsp/42.04.2020.

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Catalytic oxidation of organic volatile compounds (VOCs) is considered superior to conventional methods because very low concentration of VOCs can also be oxidized and removed at low temperatures without consumption of addditional fuel and introduction of NOx compounds into the environment. Herein, the synthesis of MnO2 nanoparticles on bentonite (Bent) support in the presence of CuO for catalytic oxidation of m-xylene is reported. The synthesized materials were analyzed with FT-IR, XRD, and TEM analysis for structural and morphological characterization. XRD and TEM analysis indicated the formation of δ-MnO2 with sheet structure on Bent surface. Temperature-programmed reduction (H2-TPR) of hydrogen was used to investigate catalytic performance of δ-MnO2 towards oxidation of m-xylene at different temperatures. The catalytic activity was strongly dependent on the δ-MnO2 content in the synthesized material. 100 % oxidation of m-xylene with observed with 10% Mn content at temperature below than 325 oC. Intersetingly introduction of CuO greatly improved the catalytic activity of Mn-Bent materials. The presence of Cu in Mn-Bent has greatly reduced the temperature for complete oxidation of m-xylene. In this case100% conversion of m-xylene was observed at 250 oC.

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9

Loiland, Jason A., and Raul F. Lobo. "Low temperature catalytic NO oxidation over microporous materials." Journal of Catalysis 311 (March 2014): 412–23. http://dx.doi.org/10.1016/j.jcat.2013.12.013.

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10

Mitani, M. M., A. A. Keller, S. J. Golden, R. Hatfield, and A. K. Cheetham. "Low temperature catalytic decomposition and oxidation of MTBE." Applied Catalysis B: Environmental 34, no. 2 (November 2001): 87–95. http://dx.doi.org/10.1016/s0926-3373(01)00205-3.

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11

Atwater, James E., James R. Akse, Jeffrey A. McKinnis, and John O. Thompson. "Low temperature aqueous phase catalytic oxidation of phenol." Chemosphere 34, no. 1 (January 1997): 203–12. http://dx.doi.org/10.1016/s0045-6535(96)00362-1.

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12

Lv, Changpeng, Dan Du, Chao Wang, Yingyue Qin, Jinlong Ge, Yansong Han, Junjie Zhu, and Muxin Liu. "The Flower-like Co3O4 Hierarchical Microspheres for Methane Catalytic Oxidation." Inorganics 10, no. 4 (April 2, 2022): 49. http://dx.doi.org/10.3390/inorganics10040049.

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The development of non-noble Co3O4 catalysts exposing highly active crystal planes to low-temperature methane oxidation is still a challenge. Hence, a facile solvothermal method was adapted to construe flower-like Co3O4 hierarchical microspheres (Co3O4-FL), which are composed of nanosheets with dominantly exposed {112} crystal planes. The flower-like hierarchical structure not only promotes the desorption of high levels of active surface oxygen and enhances reducibility, but also facilitates an increase in lattice oxygen as the active species. As a result, Co3O4-FL catalysts offer improved methane oxidation, with a half methane conversion temperature (T50) of 380 °C (21,000 mL g−1 h−1), which is much lower than that of commercial Co3O4 catalysts (Co3O4-C). This study will provide guidance for non-noble metal catalyst design and preparation for methane oxidation and other oxidative reactions.

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13

Duan, Dong, Chunxi Hao, Wenyu Shi, Haiyang Wang, and Zhanbo Sun. "Sm2O3/Co3O4 catalysts prepared by dealloying for low-temperature CO oxidation." RSC Advances 8, no. 21 (2018): 11289–95. http://dx.doi.org/10.1039/c8ra01219a.

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A series of Co₃O₄ catalysts modified by Sm were prepared by a combined dealloying and calcination approach, and the catalytic activities were evaluated using CO catalytic oxidation.

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14

Jin, Jun Eon, Jae-Hyun Lee, Jun Hee Choi, Ho-Kyun Jang, Junhong Na, Dongmok Whang, Do-Hyun Kim, and Gyu Tae Kim. "Catalytic etching of monolayer graphene at low temperature via carbon oxidation." Physical Chemistry Chemical Physics 18, no. 1 (2016): 101–9. http://dx.doi.org/10.1039/c5cp03139g.

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15

Święs, Aneta, Małgorzata Rutkowska, Andrzej Kowalczyk, Urbano Díaz, Antonio E. Palomares, and Lucjan Chmielarz. "Ferrierite and Its Delaminated Forms Modified with Copper as Effective Catalysts for NH3-SCO Process." Materials 13, no. 21 (October 30, 2020): 4885. http://dx.doi.org/10.3390/ma13214885.

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Ferrierites and their delaminated forms (ITQ-6), containing aluminum or titanium in the zeolite framework, were synthetized and modified with copper by an ion-exchange method. The obtained samples were characterized with respect to their chemical composition (ICP-OES), structure (XRD, UV-Vis DRS), textural parameters (N2-sorption), surface acidity (NH3-TPD), form and reducibility of deposited copper species (UV-Vis DRS and H2-TPR). Ferrierites and delaminated ITQ-6 zeolites modified with copper were studied as catalysts for the selective catalytic oxidation of ammonia to dinitrogen (NH3-SCO). It was shown that aggregated copper oxide species, which were preferentially formed on Ti-zeolites, were catalytically active in direct low-temperature ammonia oxidation to NO, while copper introduced into Al-zeolites was present mainly in the form of monomeric copper cations catalytically active in selective reduction of NO by ammonia to dinitrogen. It was postulated that ammonia oxidation in the presence of the studied catalysts proceeds according to the internal-selective catalytic reduction mechanism (i-SCR) and therefore the suitable ratio between aggregated copper oxide species and monomeric copper cations is necessary to obtain active and selective catalysts for the NH3-SCO process. Cu/Al-ITQ-6 presented the best catalytic properties possibly due to the most optimal ratio of these copper species.

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16

Yacob, Sara, Michael J. Caulfield, and Timothy A. Barckholtz. "Partial oxidation of alkanes by dioxiranes formed in situ at low temperature." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 376, no. 2110 (November 27, 2017): 20170055. http://dx.doi.org/10.1098/rsta.2017.0055.

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Partial oxidation catalysts capable of efficiently operating at low temperatures may limit the over-oxidation of alkane substrates and thereby improve selectivity. This work focuses on examining alkane oxidation using completely metal-free organocatalysts, dioxiranes. The dioxiranes employed here are synthesized by oxidation of a ketone using a terminal oxidant, such as hydrogen peroxide. Our work generates the dioxirane in situ , so that the process can be catalytic with respect to the ketone. To date, we have demonstrated selective partial oxidation of adamantane using ketone catalysts resulting in yields upwards of 60% towards 1-adamantanol with greater than 99% selectivity. Furthermore, we have demonstrated that changing the electrophilic character of the ketone R groups to contain more electron-donating ligands facilitates the dioxirane ring formation and improves overall oxidation yields. Isotopic labelling studies using H 2 18 O 2 show the preferential incorporation of an 18 O label into the parent ketone, providing evidence for a dioxirane intermediate formed in situ . The isotopic labelling studies, along with solvent effect studies, suggest the formation of peracetic acid as a reactive intermediate. This article is part of a discussion meeting issue ‘Providing sustainable catalytic solutions for a rapidly changing world’.

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17

Gopalakrishna, R., and W. B. Anderson. "Ca2+- and phospholipid-independent activation of protein kinase C by selective oxidative modification of the regulatory domain." Proceedings of the National Academy of Sciences 86, no. 17 (September 1989): 6758–62. http://dx.doi.org/10.1073/pnas.86.17.6758.

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The susceptibility of purified protein kinase C to oxidative inactivation by H2O2 was found to be increased by Ca2+ either alone at a high (5 mM) concentration or at a low (approximately 50 microM) concentration along with phosphatidylserine and diacylglycerol and by tumor-promoting phorbol esters even in the absence of Ca2+. This suggested that the membrane-bound and/or catalytically active form of protein kinase C is relatively more susceptible to oxidative inactivation. Although both the regulatory and catalytic domains of protein kinase C were susceptible to oxidative inactivation, a selective modification of the regulatory domain was obtained under mild oxidative conditions by protecting the catalytic site with ATP/Mg2+. Under these conditions there was a loss of both phorbol ester binding and Ca2+/phospholipid-stimulated kinase activity. However, this modified form of enzyme exhibited an increase in Ca2+/phospholipid-independent kinase activity. This suggests that selective oxidative modification of the regulatory domain may negate the requirement for Ca2+ and lipids for activation. Treatment of intact C6 glioma or B16 melanoma cells with H2O2 resulted in a time- and temperature-dependent decrease in Ca2+/phospholipid-dependent protein kinase C activity along with a concomitant transient increase in an oxidatively modified isoform of protein kinase C that exhibited activity in the absence of Ca2+ and phospholipids. Since protein kinase C can initially be activated by mild oxidative modification and subsequently inactivated by further oxidation, this dual activation-inactivation of protein kinase C in response to H2O2 suggests an effective on/off signal mechanism to influence cellular events.

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18

Wang, Xi, Wei Zhong, and Yingwei Li. "Nanoscale Co-based catalysts for low-temperature CO oxidation." Catalysis Science & Technology 5, no. 2 (2015): 1014–20. http://dx.doi.org/10.1039/c4cy01147c.

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A novel MOF-derived metallic cobalt-based catalyst for low-temperature CO oxidation was developed. This catalyst exhibited high catalytic activity even at a temperature as low as −30 °C and improved tolerance of moisture as compared to other Co-based materials.

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19

Leino, Anne-Riikka, Melinda Mohl, Jarmo Kukkola, Päivi Mäki-Arvela, Tommi Kokkonen, Andrey Shchukarev, and Krisztian Kordas. "Low-temperature catalytic oxidation of multi-walled carbon nanotubes." Carbon 57 (June 2013): 99–107. http://dx.doi.org/10.1016/j.carbon.2013.01.040.

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20

Bustamante, H., and T. Nunez-McNally. "Low Temperature Catalytic Oxidation of Voc's: Pilot Plant Studies." Environmental Technology 17, no. 11 (November 1996): 1253–60. http://dx.doi.org/10.1080/09593330.1996.9618454.

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21

Wang, Qi, Jian Liu, Yongheng Li, Zhen Zhao, Weiyu Song, and Yuechang Wei. "Mesoporous Co3O4 supported Pt catalysts for low-temperature oxidation of acetylene." RSC Advances 7, no. 30 (2017): 18592–600. http://dx.doi.org/10.1039/c7ra02266b.

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22

Jin, Dongdong, Zhiyuan Ren, Zhaoxia Ma, Fu liu, and Hangsheng Yang. "Low temperature chlorobenzene catalytic oxidation over MnOx/CNTs with the assistance of ozone." RSC Advances 5, no. 20 (2015): 15103–9. http://dx.doi.org/10.1039/c4ra16687f.

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O₃ promotes chlorobenzene catalytic oxidation over p-type MnO_x/CNTs between 80–240 °C. A CB complete oxidation of 95% is achieved below 120 °C. The reaction follows the L–H mechanism with apparent activation energy of 15.0 kJ mol⁻¹.

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23

Zhang, Yifei, Changhai Cao, and Gao Li. "Recent Progress in Green Conversion of Biomass Alcohol to Chemicals via Aerobic Oxidation." Biomass 2, no. 2 (May 16, 2022): 103–15. http://dx.doi.org/10.3390/biomass2020007.

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The aerobic oxidation of biomass transformations into valuable chemical products via a green catalytic process is one of the most important protocols because of its low reaction temperature and high productivity rate. Recently, the introduction of small-sized Cu and Au nanoparticles (e.g., 1–3 nm) upon the surface of oxides can provide more catalytic active sites and then enhance the catalytic activity of aerobic oxidations significantly. The introduction of these metal nanoparticles is a kind of perfect catalyst for enhancing the efficiency of the activation of oxygen molecules and the separation of photo-generated holes and electrons during the photo-oxidation reactions. In this account, we summarize recent progress of the aerobic oxidation of biomass alcohol toward the production of highly valuable chemicals over supported catalysts of metal nanoparticles (NPs), including methanol conversion into methyl formate via photo-oxidation over CuOx/TiO2 nanocomposites, biomass ethanol transformation with biomass furfural to produce hydrocarbons biofuels over Au/NiO catalysts, and glucose oxidation to gluconic acid using Au/activated carbon (Au/AC) as catalysts. Furthermore, at the atomic level, to understand the structure-property correlations, insights into molecular activations of oxygen and biomass, and the investigation of active catalytic sites on photo/catalysts will be detailed and discussed. Finally, future studies are needed to achieve more exciting progress in the fundamental revealing of the catalytic reaction mechanisms and conversion pathway and the future perspective in industrial applications.

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24

Yang, Li, Chao Fan, Li Luo, Yanyan Chen, Zhiwei Wu, Zhangfeng Qin, Mei Dong, Weibin Fan, and Jianguo Wang. "Preparation of Pd/SiO2 Catalysts by a Simple Dry Ball-Milling Method for Lean Methane Oxidation and Probe of the State of Active Pd Species." Catalysts 11, no. 6 (June 11, 2021): 725. http://dx.doi.org/10.3390/catal11060725.

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A series of Pd/SiO2 catalysts were prepared with different Pd precursors by a dry ball-milling method and used in the catalytic oxidation of lean methane at low temperature. The effect of Pd precursors on the catalytic performance was investigated and the state of the most active Pd species was probed. The results indicate that dry ball-milling is a simple but rather effective method to prepare the Pd/SiO2 catalysts for lean methane oxidation, and palladium acetylacetonate is an ideal precursor to obtain a highly active Pd/SiO2-Acac catalyst with well- and stably dispersed Pd species, owing to the tight contact between acetylacetonate and Si–OH on the SiO2 support. Besides the size and dispersion of Pd particles, the oxidation state of Pd species also plays a crucial role in determining the catalytic activity of Pd/SiO2 in lean methane oxidation at low temperature. A non-monotonic dependence of the catalytic activity on the Pd oxidation state is observed. The activity of various Pd species follows the order of PdOx >> Pd > PdO; the PdOx/SiO2-Acac catalysts (in particular for PdO0.82/SiO2-Acac when x = 0.82) exhibit much higher activity in lean methane oxidation at low temperature than Pd/SiO2-Acac and PdO/SiO2-Acac. The catalytic activity of PdOx/SiO2 may degrade during the methane oxidation due to the gradual transformation of PdOx to PdO in the oxygen-rich ambiance; however, such degradation is reversible and the activity of a degraded Pd/SiO2 catalyst can be recovered through a redox treatment to regain the PdOx species. This work helps to foster a better understanding of the relationship between the structure and performance of supported Pd catalysts by clarifying the state of active Pd species, which should be beneficial to the design of an active catalyst in lean methane oxidation at low temperature.

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Yang, Hongling, Chunyan Ma, Gang Wang, Yonggang Sun, Jie Cheng, Zhongshen Zhang, Xin Zhang, and Zhengping Hao. "Fluorine-enhanced Pt/ZSM-5 catalysts for low-temperature oxidation of ethylene." Catalysis Science & Technology 8, no. 7 (2018): 1988–96. http://dx.doi.org/10.1039/c8cy00130h.

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Huang, Yongchao, Haibo Li, Muhammad-Sadeeq Balogun, Hao Yang, Yexiang Tong, Xihong Lu, and Hongbing Ji. "Three-dimensional TiO2/CeO2 nanowire composite for efficient formaldehyde oxidation at low temperature." RSC Advances 5, no. 10 (2015): 7729–33. http://dx.doi.org/10.1039/c4ra13906b.

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TiO₂/CeO₂ nanowires exhibited superior catalytic activity that could convert 60.2% of HCHO to CO₂ and H₂O at a low temperature of 60 °C, and also showed a good catalytic activity toward toluene oxidation.

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Han, Qiuwan, Dongyang Zhang, Jiuli Guo, Baolin Zhu, Weiping Huang, and Shoumin Zhang. "Improved Catalytic Performance of Au/α-Fe2O3-Like-Worm Catalyst for Low Temperature CO Oxidation." Nanomaterials 9, no. 8 (August 3, 2019): 1118. http://dx.doi.org/10.3390/nano9081118.

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The gold catalysts supported on various morphologies of α-Fe2O3 in carbon monoxide (CO) oxidation reaction have been studied for many researchers. However, how to improve the catalytic activity and thermal stability for CO oxidation is still important. In this work, an unusual morphology of α-Fe2O3 was prepared by hydrothermal method and gold nanoparticles were supported using a deposition-precipitation method. Au/α-Fe2O3 catalyst exhibited great activity for CO oxidation. The crystal structure and microstructure images of α-Fe2O3 were carried out by X-ray diffraction (XRD) and scanning electron microscopy (SEM) and the size of gold nanoparticles was determined by transmission electron microscopy (TEM). X-ray photoelectron spectra (XPS) and Fourier transform infrared spectra (FTIR) results confirmed that the state of gold was metallic. The 1.86% Au/α-Fe2O3 catalyst calcined at 300 °C had the best catalytic performance for CO oxidation reaction and the mechanism for CO oxidation reaction was also discussed. It is highly likely that the small size of gold nanoparticle, oxygen vacancies and active sites played the decisive roles in CO oxidation reaction.

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Wang, Chao, Chuanhui Zhang, Wenchao Hua, Yanglong Guo, Guanzhong Lu, Sonia Gil, and Anne Giroir-Fendler. "Low-temperature catalytic oxidation of vinyl chloride over Ru modified Co3O4 catalysts." RSC Advances 6, no. 101 (2016): 99577–85. http://dx.doi.org/10.1039/c6ra18503g.

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29

Zhu, Yuning, Chun Du, Zijian Feng, Yongjie Chen, Hang Li, Rong Chen, Meiqing Shen, and Bin Shan. "Highly dispersed Pd on macroporous SmMn2O5 mullite for low temperature oxidation of CO and C3H8." RSC Advances 8, no. 10 (2018): 5459–67. http://dx.doi.org/10.1039/c7ra11551b.

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Pd-modified SMO mullite catalysts were synthesized and found to have excellent catalytic activity for CO and C₃H₈ oxidation. The remarkable oxidation activity was attributed to the high Pd dispersion.

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30

Zhang, Xinhua, Zhiying Pei, Xingjie Ning, Hanfeng Lu, and Haifeng Huang. "Catalytic low-temperature combustion of dichloromethane over V–Ni/TiO2 catalyst." RSC Advances 5, no. 96 (2015): 79192–99. http://dx.doi.org/10.1039/c5ra13174j.

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Saud, Shirjana, Duc Ba Nguyen, Seung-Geon Kim, Ho Won Lee, Seong Bong Kim, and Young Sun Mok. "Improvement of Ethylene Removal Performance by Adsorption/Oxidation in a Pin-Type Corona Discharge Coupled with Pd/ZSM-5 Catalyst." Catalysts 10, no. 1 (January 17, 2020): 133. http://dx.doi.org/10.3390/catal10010133.

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The adsorption and plasma-catalytic oxidation of dilute ethylene were performed in a pin-type corona discharge-coupled Pd/ZSM-5 catalyst. The catalyst has an adsorption capacity of 320.6 μ mol g cat − 1 . The catalyst was found to have two different active sites activated at around 340 and 470 °C for ethylene oxidation. The removal of ethylene in the plasma catalyst was carried out by cyclic operation consisting of repetitive steps: (1) adsorption (60 min) followed by (2) plasma-catalytic oxidation (30 min). For the purpose of comparison, the removal of ethylene in the continuous plasma-catalytic oxidation mode was also examined. The ethylene adsorption performance of the catalyst was improved by the cyclic plasma-catalytic oxidation. With at least 80% of C2H4 in the feed being adsorbed, the cyclic plasma-catalytic oxidation was carried out for the total adsorption time of 8 h, whereas it occurred within 2 h of early adsorption in the case of catalyst alone. There was a slight decrease in catalyst adsorption capability with an increased number of adsorption cycles due to the incomplete release of CO2 during the plasma-catalytic oxidation step. However, the decreased rate of adsorption capacity was negligible, which is less than one percent per cycle. Since the activation temperature of all active sites of Pd/ZSM-5 for ethylene oxidation is 470 °C, the specific input energy requirement by heating the feed gas in order to activate the catalyst is estimated to be 544 J/L. This value is higher than that of the continuous plasma-catalytic oxidation (450 J/L) for at least 86% ethylene conversion. Interestingly, the cyclic adsorption and plasma-catalytic oxidation of ethylene is not only a low-temperature oxidation process but also reduces energy consumption. Specifically, the input energy requirement was 225 J/L, which is half that of the continuous plasma-catalytic oxidation; however, the adsorption efficiency and conversion rate were maintained. To summarize, cyclic plasma treatment is an effective ethylene removal technique in terms of low-temperature oxidation and energy consumption.

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Peng, Liwen, Haiwang Wang, and Mengge Lv. "A Novel Preparation of Mn/NiCo2O4 Catalyst with High Catalytic Activity on Methane." Journal of Nanoelectronics and Optoelectronics 16, no. 6 (June 1, 2021): 926–32. http://dx.doi.org/10.1166/jno.2021.3029.

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In this paper, a Mn/NiCo2O4 catalyst was prepared for the complete oxidation of low-concentration methane. When the ratio of Mn: Co is 1:4, the catalyst has the best catalytic activity, and the best methane conversion temperature Feis 400 °C. In addition, the catalytic activity remains stable during the long-term reaction, showing adequate thermal stability. The catalyst is grown on FeCrAl alloy by hydrothermal method to complete the catalytic oxidation of methane. In the catalysis process, the Mn/NiCo2O4-FeCrAl catalyst is energized and the current is directly passed through the alloy substrate to generate Joule heat, reaching the optimal catalytic temperature for complete oxidation of methane.

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33

Zhao, Yanlei, Hua Tian, Junhui He, and Qiaowen Yang. "Catalytic Oxidation of Formaldehyde Over Mesoporous MnOx-CeO2 Catalysts." International Journal of Nanoscience 14, no. 01n02 (February 2015): 1460028. http://dx.doi.org/10.1142/s0219581x1460028x.

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Formaldehyde is regarded as the major indoor air pollutant. Because of harmful effect on human health, its emission abatement is of significant practical interest. We report here excellent low-temperature catalytic performances of mesoporous MnO x - CeO 2 catalysts in the process of formaldehyde oxidation. These MnO x - CeO 2 catalysts were synthesized by a "nanocasting" method using SBA-15 as hard template. TEM images showed that the as-fabricated MnO x - CeO 2 composites possess well-ordered mesoporous architectures. Results of catalytic tests revealed that mesoporous MnO x - CeO 2 nanocomposites have excellent low-temperature catalytic activity for formaldehyde oxidation, the temperature for 100% formaldehyde conversion can be as low as 65°C over these noble-metal-free mesoporous catalysts. The excellent catalytic performance is attributed to their ordered mesoporous structures that expose abundant active sites to formaldehyde molecules.

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Lu, Suhong, Xue Wang, Qinyu Zhu, Canchang Chen, Xuefeng Zhou, Fenglin Huang, Kelun Li, Lulu He, Yanxiong Liu, and Fanjue Pang. "Ag–K/MnO2 nanorods as highly efficient catalysts for formaldehyde oxidation at low temperature." RSC Advances 8, no. 26 (2018): 14221–28. http://dx.doi.org/10.1039/c8ra01611a.

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35

Cui, Yan, Leilei Xu, Mindong Chen, Chufei Lv, Xinbo Lian, Cai-e. Wu, Bo Yang, Zhichao Miao, Fagen Wang, and Xun Hu. "CO Oxidation over Metal Oxide (La2O3, Fe2O3, PrO2, Sm2O3, and MnO2) Doped CuO-Based Catalysts Supported on Mesoporous Ce0.8Zr0.2O2 with Intensified Low-Temperature Activity." Catalysts 9, no. 9 (August 28, 2019): 724. http://dx.doi.org/10.3390/catal9090724.

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CuO-based catalysts are usually used for CO oxidation owing to their low cost and excellent catalytic activities. In this study, a series of metal oxide (La2O3, Fe2O3, PrO2, Sm2O3, and MnO2)-doped CuO-based catalysts with mesoporous Ce0.8Zr0.2O2 support were simply prepared by the incipient impregnation method and used directly as catalysts for CO catalytic oxidation. These mesoporous catalysts were systematically characterized by X-ray powder diffraction (XRD), N2 physisorption, transmission electron microscopy (TEM), energy-dispersed spectroscopy (EDS) mapping, X-ray photoelectron spectroscopy (XPS), and H2 temperature programmed reduction (H2-TPR). It was found that the CuO and the dopants were highly dispersed among the mesoporous framework via the incipient impregnation method, and the strong metal framework interaction had been formed. The effects of the types of the dopants and the loading amounts of the dopants on the low-temperature catalytic performances were carefully studied. It was concluded that doped transition metal oxides could regulate the oxygen mobility and reduction ability of catalysts, further improving the catalytic activity. It was also found that the high dispersion of rare earth metal oxides (PrO2, Sm2O3) was able to prevent the thermal sintering and aggregation of CuO-based catalysts during the process of calcination. In addition, their presence also evidently improved the reducibility and significantly reduced the particle size of the CuO active sites for CO oxidation. The results demonstrated that the 15CuO-3Fe2O3/M-Ce80Zr20 catalyst with 3 wt. % of Fe2O3 showed the best low-temperature catalytic activity toward CO oxidation. Overall, the present Fe2O3-doped CuO-based catalysts with mesoporous nanocrystalline Ce0.8Zr0.2O2 solid solution as support were considered a promising series of catalysts for low-temperature CO oxidation.

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Indrawirawan, Stacey, Hongqi Sun, Xiaoguang Duan, and Shaobin Wang. "Low temperature combustion synthesis of nitrogen-doped graphene for metal-free catalytic oxidation." Journal of Materials Chemistry A 3, no. 7 (2015): 3432–40. http://dx.doi.org/10.1039/c4ta05940a.

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Jan, Asif, Jisu Shin, Junsung Ahn, Sungeun Yang, Kyung Joong Yoon, Ji-Won Son, Hyoungchul Kim, Jong-Ho Lee, and Ho-Il Ji. "Promotion of Pt/CeO2 catalyst by hydrogen treatment for low-temperature CO oxidation." RSC Advances 9, no. 46 (2019): 27002–12. http://dx.doi.org/10.1039/c9ra05965b.

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Wang, Wenhuan, Ruitang Guo, Weiguo Pan, and Guoxin Hu. "Low temperature catalytic oxidation of NO over different-shaped CeO2." Journal of Rare Earths 36, no. 6 (June 2018): 588–93. http://dx.doi.org/10.1016/j.jre.2017.10.002.

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Huang, Haibao, Ying Xu, Qiuyu Feng, and Dennis Y. C. Leung. "Low temperature catalytic oxidation of volatile organic compounds: a review." Catalysis Science & Technology 5, no. 5 (2015): 2649–69. http://dx.doi.org/10.1039/c4cy01733a.

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40

Bonny, R., C. Lenfant, and F. C. Thyrion. "Catalytic oxidation and decomposition of CH2Cl2on supported CrO3at low temperature." International Journal of Environmental Studies 53, no. 1-2 (August 1997): 75–85. http://dx.doi.org/10.1080/00207239708711117.

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Dobrosz-Gómez, Izabela, Miguel-Ángel Gómez-García, and Jacek Michał Rynkowski. "The Origin of Au/Ce1-xZrxO2 Catalyst’s Active Sites in Low-Temperature CO Oxidation." Catalysts 10, no. 11 (November 13, 2020): 1312. http://dx.doi.org/10.3390/catal10111312.

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Gold catalysts have found applications in many reactions of both industrial and environmental importance. Great interest has been paid to the development of new processes that reduce energy consumption and minimize pollution. Among these reactions, the catalytic oxidation of carbon monoxide (CO) is an important one, considering that a high concentration of CO in the atmosphere creates serious health and environmental problems. This paper examines the most important achievements and conclusions arising from the own authorship contributions concerning (2 wt. % Au)/Ce1−xZrxO2 catalyst’s active sites in low-temperature CO oxidation. The main findings of the present review are: (1) The effect of preparing conditions on Au crystallite size, highlighting some of the fundamental underpinnings of gold catalysis: the Au surface composition and the poisoning effect of residual chloride on the catalytic activity of (2 wt. % Au)/Ce1−xZrxO2 catalysts in CO oxidation; (2) The identification of ion clusters related to gold and their effect on catalyst’ surface composition; (3) The importance of physicochemical properties of oxide support (e.g., its particle size, oxygen mobility at low temperature and redox properties) in the creation of catalytic performance of Au catalysts; (4) The importance of oxygen vacancies, on the support surface, as the centers for oxygen molecule activation in CO reaction; (5) The role of moisture (200–1000 ppm) in the generation of enhanced CO conversion; (6) The Au-assisted Mars-van Krevelen (MvK) adsorption–reaction model was pertinent to describe CO oxidation mechanism. The principal role of Au in CO oxidation over (2 wt. % Au)/Ce1−xZrxO2 catalysts was related to the promotion in the transformation process of reversibly adsorbed or inactive surface oxygen into irreversibly adsorbed active species; (7) Combination of metallic gold (Au0) and Au-OH species was proposed as active sites for CO adsorption. These findings can help in the optimization of Au-containing catalysts.

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Touati, Houcine, Afef Mehri, Fathi Karouia, Frédéric Richard, Catherine Batiot-Dupeyrat, Stéphane Daniele, and Jean-Marc Clacens. "Low-Temperature O3 Decomposition over Pd-TiO2 Hybrid Catalysts." Catalysts 12, no. 4 (April 18, 2022): 448. http://dx.doi.org/10.3390/catal12040448.

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In aircraft and spacecraft, outside air is not directly fed to the passenger because it contains ozone at elevated altitudes. The decomposition of low concentration ozone in the air was carried out at 25 °C by catalytic oxidation on Pd-based catalysts supported on a high surface area hybrid TiO2. The use of these hybrid catalysts has shown a beneficial effect, both on the catalytic activity and on the catalyst stability. Kinetic studies showed that the most promising catalytic phase (Pd/TiO2_100) was the one obtained from the TiO2 support containing the lowest content of citrate ligands and leading to small Pd particles (around 4 nm). The effect of catalyst synthesis on the decomposition of O3 gas (15 ppm) in a dry and humid (HR = 10%) stream in a closed environment such as aircraft or spacecraft was also investigated in this study and further elucidated by detailed characterizations. It was shown that the system could be used as an effective treatment for air coming from outside.

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Figueredo, Miguel Jose Marin, Clarissa Cocuzza, Samir Bensaid, Debora Fino, Marco Piumetti, and Nunzio Russo. "Catalytic Abatement of Volatile Organic Compounds and Soot over Manganese Oxide Catalysts." Materials 14, no. 16 (August 12, 2021): 4534. http://dx.doi.org/10.3390/ma14164534.

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A set of manganese oxide catalysts was synthesized via two preparation techniques: solution combustion synthesis (Mn3O4/Mn2O3-SCS and Mn2O3-SCS) and sol-gel synthesis (Mn2O3-SG550 and Mn2O3-SG650). The physicochemical properties of the catalysts were studied by means of N2-physisorption at −196 °C, X-ray powder diffraction, H2 temperature-programmed reduction (H2-TPR), soot-TPR, X-ray photoelectron spectroscopy (XPS) and field-emission scanning electron microscopy (FESEM). The high catalytic performance of the catalysts was verified in the oxidation of Volatile Organic Compounds (VOC) probe molecules (ethene and propene) and carbon soot in a temperature-programmed oxidation setup. The best catalytic performances in soot abatement were observed for the Mn2O3-SG550 and the Mn3O4/Mn2O3-SCS catalysts. The catalytic activity in VOC total oxidation was effectively correlated to the enhanced low-temperature reducibility of the catalysts and the abundant surface Oα-species. Likewise, low-temperature oxidation of soot in tight contact occurred over the Mn2O3-SG550 catalyst and was attributed to high amounts of surface Oα-species and better surface reducibility. For the soot oxidation in loose contact, the improved catalytic performance of the Mn3O4/Mn2O3-SCS catalyst was attributed to the beneficial effects of both the morphological structure that—like a filter—enhanced the capture of soot particles and to a probable high amount of surface acid-sites, which is characteristic of Mn3O4 catalysts.

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Wang, Xi, Jiawei Ying, Yuliang Mai, Junjie Zhang, Jiazhi Chen, Mingtong Wen, and Lin Yu. "MOF-derived metal oxide composite Mn2Co1Ox/CN for efficient formaldehyde oxidation at low temperature." Catalysis Science & Technology 9, no. 20 (2019): 5845–54. http://dx.doi.org/10.1039/c9cy01104h.

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45

Jia, Yuxiang, Xiaojun Bu, Junyu Dong, Quan Zhou, Min Liu, Fang Wang, and Maoyuan Wang. "Catalytic Polymerization of Phthalonitrile Resins by Carborane with Enhanced Thermal Oxidation Resistance: Experimental and Molecular Simulation." Polymers 14, no. 1 (January 5, 2022): 219. http://dx.doi.org/10.3390/polym14010219.

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Biphenyl phthalonitrile (BPh) resins with good thermal and thermo-oxidative stability demonstrate great application potential in aerospace and national defense industries. However, BPh monomer has a high melting point, poor solubility, slow curing speed and high curing temperature. It is difficult to control the polymerization process to obtain the resins with high performance. Here, a BPh prepolymer (BPh-Q) was prepared by reacting 1,7-bis(hydroxymethyl)-m-carborane (QCB) with BPh monomers. The BPh-Q exhibited much better solubility, faster curing speed and lower curing temperature compared with pure BPh and BPh modified with bisphenol A (BPh-B, a common prepolymer of BPh). Thus, the polymerization process of BPh was greatly accelerated at a low temperature, resulting in a BPh resin with enhanced thermostability and oxidation resistance. The experimental and theoretical models revealed the promotion effect of B-H bond on the curing reaction of phthalonitrile via Markovnikov addition reaction due to the special steric structure of carborane. This study provided an efficient method to obtain low-temperature curing phthalonitrile resins with high thermal and thermo-oxidative resistance, which would be potentially useful for the preparation of high-performance cyanide resin-based composites.

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Zheng, Bin, Gang Liu, Longlong Geng, Junyan Cui, Shujie Wu, Ping Wu, Mingjun Jia, Wenfu Yan, and Wenxiang Zhang. "Role of the FeOxsupport in constructing high-performance Pt/FeOxcatalysts for low-temperature CO oxidation." Catalysis Science & Technology 6, no. 5 (2016): 1546–54. http://dx.doi.org/10.1039/c5cy00840a.

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47

Jiang, Quan, Hai-Yang Hu, Can-Cheng Guo, Qiang Liu, Jian-Xin Song, and Qing-Hong Li. "Aerobic liquid-phase oxidation of p-xylene over metalloporphyrins." Journal of Porphyrins and Phthalocyanines 11, no. 07 (July 2007): 524–30. http://dx.doi.org/10.1142/s1088424607000618.

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The five metalloporphyrins ( T (p- Cl ) PPM , M = Fe , Mn , Co , Cu , Zn ) with different metal nuclei were synthesized, and their catalytic aerobic liquid-phase oxidations of p-xylene into p-toluic acid, p-toluic aldehyde and terephthalic acid using a low concentration of acetic acid as solvent without any halide additives, were studied. The p-xylene conversions and the oxidation product distributions were found to be affected by the structures and concentration of the metalloporphyrins as well as the reaction parameters such as time, temperature and air pressure. The formation of some intermediate oxidation products in the oxidation process also influenced the reaction conversions and the product distribution. Among the metalloporphyrins used, tetrakis(p-chlorophenylporphinato)manganese chloride ( T (p- Cl ) PPMnCl ) was the most efficient catalyst for the oxidation of p-xylene. Under the conditions of 180 °C and 2.0 MPa, 44% conversion of p-xylene and 85% selectivity of p-toluic acid were obtained. Based on the results obtained, a preliminary mechanism of the oxidation of p-xylene over metalloporphyrins was proposed.

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Zhang, Ping, Huanhuan Yu, Jingjing Li, Hang Zhao, Baolin Zhu, Weiping Huang, and Shoumin Zhang. "Au/BiPO4 nanorod catalysts: synthesis, characterization and their catalytic performance for CO oxidation." RSC Advances 6, no. 19 (2016): 15304–12. http://dx.doi.org/10.1039/c6ra00399k.

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Zheng, Xiang, Chuanhui Zhang, Dongsen Mao, Haifang Mao, and Jun Yu. "Fabrication of MnCoO_x composite oxides for catalytic CO oxidation via a solid-phase synthesis: the significant effect of the manganese precursor." New Journal of Chemistry 46, no. 9 (2022): 4343–52. http://dx.doi.org/10.1039/d1nj06026k.

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Mn3Co16Ox with variable manganese precursors were prepared for catalytic CO oxidation. Specific surface area, low-temperature reducibility and lattice oxygen mobility, and the presence of oxygen vacancies are the key factors for CO oxidation.

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50

Guo, Aijun, Chongchong Wu, Peng He, Yingqi Luan, Lulu Zhao, Wenpo Shan, Wei Cheng, and Hua Song. "Low-temperature and low-pressure non-oxidative activation of methane for upgrading heavy oil." Catalysis Science & Technology 6, no. 4 (2016): 1201–13. http://dx.doi.org/10.1039/c5cy00947b.

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This study creates a novel catalytic route for low-temperature and low-pressure non-oxidative utilization of methane and opens a door for upgrading heavy oil with natural gas under fairly mild operation conditions instead of expensive hydrogen under rather stringent ones.

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