Auswahl der wissenschaftlichen Literatur zum Thema „Ni-Based catalysts“

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Zeitschriftenartikel zum Thema "Ni-Based catalysts"

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Liu, Ning, Sha Cui, Zheyu Jin, et al. "Highly Dispersed and Stable Ni/SiO2 Catalysts Prepared by Urea-Assisted Impregnation Method for Reverse Water–Gas Shift Reaction." Processes 11, no. 5 (2023): 1353. http://dx.doi.org/10.3390/pr11051353.

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The nickel-based catalyst was more active in the reverse water-gas shift reaction, but it is easy to sinter and deactivate in high temperature reaction (≥600 °C). A urea-assisted impregnation method was utilized to create a Ni/SiO2-N catalyst to increase the catalytic stability of Ni-based catalysts. For at least 20 h, the Ni/SiO2-N catalyst in the reverse water-gas shift process at 700 °C remained stable, and in the high temperature RWGS reaction, the conversion rate of CO2 of the catalyst is close to the equilibrium conversion rate. The catalysts were characterized by BET, XRD, H2-TPR, and T
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Yamanaka, Nobutaka, and Shogo Shimazu. "Selective Hydrogenation Properties of Ni-Based Bimetallic Catalysts." Eng 3, no. 1 (2022): 60–77. http://dx.doi.org/10.3390/eng3010006.

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Metallic Ni shows high activity for a variety of hydrogenation reactions due to its intrinsically high capability for H2 activation, but it suffers from low chemoselectivity for target products when two or more reactive functional groups are present on one molecule. Modification by other metals changes the geometric and electronic structures of the monometallic Ni catalyst, providing an opportunity to design Ni-based bimetallic catalysts with improved activity, chemoselectivity, and durability. In this review, the hydrogenation properties of these catalysts are described starting from the typi
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Omoregbe, Osaze, Artur J. Majewski, Robert Steinberger-Wilckens, and Ahmad El-kharouf. "Investigating the Effect of Ni Loading on the Performance of Yttria-Stabilised Zirconia Supported Ni Catalyst during CO2 Methanation." Methane 2, no. 1 (2023): 86–102. http://dx.doi.org/10.3390/methane2010007.

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CO2 methanation was studied on Ni-based yttria-stabilised zirconia (Ni/YSZ) catalysts. The catalysts were prepared by the wet impregnation method, where the amount of Ni content was varied from 5% to 75%. Thereafter, the prepared catalysts were analysed by BET, XRD, SEM and H2-TPR. BET results showed an initial increase in the surface area with an increase in Ni loading, then a decrease after 30% Ni loading. The XRD results revealed that the Ni crystallite size increased as the Ni loading increased, while the H2-TPR showed a shift in reduction peak temperature to a higher temperature, indicati
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Kakinuma, Katsuyoshi, Guoyu Shi, Tetsuro Tano, et al. "Anodic/Cathodic Properties of Ni Based Catalysts for Anion Electrolyte Membrane Water Electrolysis." ECS Meeting Abstracts MA2023-01, no. 36 (2023): 2090. http://dx.doi.org/10.1149/ma2023-01362090mtgabs.

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Anion electrolyte membrane water electrolysis (AEM WE) using non-precious metal catalyst is one of the most prospective systems for pure hydrogen generation. The Ni based oxide shows relatively lower overpotential of oxygen evolution reaction (OER) by adding the transition metals of Co, Fe and Mn, and approaches that of precious metal of Ir based oxide. Our previous study reported that the Ni-Co based catalyst was highest OER activity at operating temperature. The crystallized Ni-Co metal-based core particles with amorphous Ni oxyhydrates of top surface (shell) was confirmed to be preferable t
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Ren, Hua-Ping, Si-Yi Ding, Qiang Ma, et al. "The Effect of Preparation Method of Ni-Supported SiO2 Catalysts for Carbon Dioxide Reforming of Methane." Catalysts 11, no. 10 (2021): 1221. http://dx.doi.org/10.3390/catal11101221.

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Reforming methane to produce syngas is a subject that generates considerable interest. The process requires catalysts that possess high-performance active sites to activate stable C–H bonds. Herein, we report a facile synthetic strategy to prepare Ni-based catalysts by complexation–impregnation (Ni-G/SiO2-C) and precipitation–impregnation (Ni-G/SiO2-P) methods using glycine as a complexing agent. The particle size of Ni in both types of catalysts is decreased by adding glycine in the preparation process. Nevertheless, the preparation methods and amount of glycine play a significant role in the
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Matos, Juan, and Maibelin Rosales. "Promoter Effect upon Activated Carbon-Supported Ni-Based Catalysts in Dry Methane Reforming." Eurasian Chemico-Technological Journal 14, no. 1 (2011): 5. http://dx.doi.org/10.18321/ectj91.

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<p>The influence of selected promoters such as Ca, Mg, Cu and Zn upon activated carbon-supported Ni-based catalysts in the dry methane reforming under mild experimental conditions (650 ºC, 1 atm) was verified. It was found that Ni-Mg catalyst showed the highest initial catalytic activity followed by NiCa/AC catalyst. As expected, catalysts promoted with the most basic oxides such as MgO or CaO showed moderate deactivation after 4 h reaction ascribed to the basic Lewis behaviour which stabilize Ni-based catalysts.</p>
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Kim, Jaerim, Sang-Mun Jung, Yong-Tae Kim, and Jong Kyu Kim. "Efficient Alkaline Hydrogen Evolution Reaction Using Superaerophobic Ni Nanoarrays with Accelerated H2 Bubble Release." ECS Meeting Abstracts MA2023-02, no. 42 (2023): 2150. http://dx.doi.org/10.1149/ma2023-02422150mtgabs.

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Water electrolysis for producing green hydrogen is of central importance in the hydrogen economy to meet the global mission of carbon neutrality. Hydrogen evolution reaction (HER) under alkaline conditions has many advantages in cost and stability over acidic HER, but it requires high overpotential due to sluggish reaction kinetics. Pt-based materials are still considered the benchmark for HER catalysts, however, their high cost is the major hurdle for large-scale applications, motivating tremendous efforts to find earth-abundant catalytic materials as alternatives. In addition to catalytic ma
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Xiao, Yan, Jie Li, Yuan Tan, et al. "Ni-Based Hydrotalcite (HT)-Derived Cu Catalysts for Catalytic Conversion of Bioethanol to Butanol." International Journal of Molecular Sciences 24, no. 19 (2023): 14859. http://dx.doi.org/10.3390/ijms241914859.

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Catalytic conversion of biomass-derived ethanol into n-butanol through Guerbet coupling reaction has become one of the key reactions in biomass valorization, thus attracting significant attention recently. Herein, a series of supported Cu catalysts derived from Ni-based hydrotalcite (HT) were prepared and performed in the continuous catalytic conversion of ethanol into butanol. Among the prepared catalysts, Cu/NiAlOx shows the best performance in terms of butanol selectivity and catalyst stability, with a sustained ethanol conversion of ~35% and butanol selectivity of 25% in a time-on-stream (
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Deo, Yashwardhan, Niklas Thissen, and Anna K. Mechler. "Electrodeposited Ni-Based Catalysts for the Oxygen Evolution Reaction." ECS Meeting Abstracts MA2023-02, no. 20 (2023): 1255. http://dx.doi.org/10.1149/ma2023-02201255mtgabs.

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Alkaline water electrolysis is one of the most mature technologies for producing green hydrogen. However, there still are possibilities to enhance this process by using better electrocatalysts for the kinetically limited oxygen evolution reaction (OER). While there are several existing methods for catalyst synthesis, such as spray coating, coprecipitation and hydrothermal synthesis, they face challenges of either versatility or scalability.[1,2] In this regard, electrodeposition is a promising catalyst synthesis method, due to its excellent process control and ease of scalability. In this work
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Xiao, Yan, Nannan Zhan, Jie Li, Yuan Tan, and Yunjie Ding. "Highly Selective and Stable Cu Catalysts Based on Ni–Al Catalytic Systems for Bioethanol Upgrading to n-Butanol." Molecules 28, no. 15 (2023): 5683. http://dx.doi.org/10.3390/molecules28155683.

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The catalytic upgrading of ethanol into butanol through the Guerbet coupling reaction has received increasing attention recently due to the sufficient supply of bioethanol and the versatile applications of butanol. In this work, four different supported Cu catalysts, i.e., Cu/Al2O3, Cu/NiO, Cu/Ni3AlOx, and Cu/Ni1AlOx (Ni2+/Al3+ molar ratios of 3 and 1), were applied to investigate the catalytic performances for ethanol conversion. From the results, Ni-containing catalysts exhibit better reactivity; Al-containing catalysts exhibit better stability; but in terms of ethanol conversion, butanol se
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Dissertationen zum Thema "Ni-Based catalysts"

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Miranda, Morales Bárbara Cristina. "HYDROGENOLYSIS OF GLYCEROL OVER NI-BASED CATALYSTS." Doctoral thesis, Universitat Rovira i Virgili, 2014. http://hdl.handle.net/10803/284041.

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La demanda de energía en el mundo va en aumento año a año. Los sistemas de producción y patrones de consumo actuales son insostenibles. Existe la necesidad de desarrollar nuevas formas de satisfacer no sólo, la demanda de energía y producción de compuestos químicos, sino también de encontrar una forma de hacerlo que sea amigable con el ambiente. El glicerol, como recurso biomásico, representa una alternativa a esto. El catalizador cumple un papel clave en el mecanismo de rompimiento de los enlaces C-C y C-O del glicerol, y modula la selectividad hacia los productos deseados. Debido a esto, el
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Cárdenas-Arenas, Andrea. "Ni-based catalysts supported on CeO2 for CO2 valorisation." Doctoral thesis, Universidad de Alicante, 2021. http://hdl.handle.net/10045/115053.

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Esta Tesis Doctoral se ha enfocado en el diseño y síntesis de catalizadores de NiO-CeO2 para la metanación de CO2 y el reformado seco de metano, como alternativas para la revalorización de CO2. Concretamente, se ha estudiado el mecanismo de reacción de la metanación de CO2 sobre sistemas catalíticos NiO-CeO2 y se han optimizado los sitios activos implicados en esta reacción. Además, se ha estudiado la influencia de la morfología de los catalizadores NiO-CeO2 en su comportamiento catalítico para la reacción de metanación de CO2 utilizando diferentes tipos de materiales, como nanopartículas, nan
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Albarazi, Abdulkader. "Development of Ni-based catalysts for methane dry reforming application." Paris 6, 2013. http://www.theses.fr/2013PA066814.

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Houache, Mohamed Seif Eddine. "Efficient Nanostructured Ni-Based Catalysts for Electrochemical Valorization of Glycerol." Thesis, Université d'Ottawa / University of Ottawa, 2020. http://hdl.handle.net/10393/41208.

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The biodiesel industry produces millions of kilograms of low-value glycerol, which must be either stored or disposed of, creating environmental concerns. Even though glycerol is utilized as a raw material within various industries its supply is still superior to the demand. Upgrading this biodiesel by-product into value-added products using electrochemical technologies is a promising approach and will make biodiesel production more environmentally friendly with added financial benefits. Precious metals are the state-of-the-art electro-catalysts for the oxidation of organic compounds, and so
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Mukka, Mayuri. "Parametric study of the partial oxidation of propane over Ni and Pt based catalysts." Morgantown, W. Va. : [West Virginia University Libraries], 2010. http://hdl.handle.net/10450/11243.

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Thesis (M.S.)--West Virginia University, 2010.<br>Title from document title page. Document formatted into pages; contains xiii, 130 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 125-129).
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González, Arcos Angélica Viviana. "RhPt and Ni based catalysts for fuel reforming in energy conversion." Doctoral thesis, KTH, Kemisk teknologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-160026.

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Although current trends in global warming are of great concern, energy demand is still increasing, resulting in increasing pollutant emissions. To address this issue, we need reliable renewable energy sources, lowered pollutant emissions, and efficient and profitable processes for energy conversion. We also need to improve the use of the energy, produced by existing infrastructure. Consequently, the work presented in this thesis aims at investigating current scientific and technological challenges in energy conversion through biomass gasification and the alternative use of fossil fuels, such a
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Moni, Lucky. "Ni(II) and Pd(II) based catalysts for α-olefin polymerisation". Master's thesis, University of Cape Town, 1999. http://hdl.handle.net/11427/9955.

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Yan, Wei. "Nickel-based Catalysts for Urea Electro-oxidation." Ohio University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1391419479.

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Cao, Pengfei. "The development of Ni based catalysts for carbon dioxide reforming of methane." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/46876/.

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Recently, with the rapid development of human society, meeting energy demand and controlling climate change are becoming urgent issues. Carbon dioxide (dry) reforming of methane (DRM) has been considered as a promising technology as it utilizes greenhouse gas to provide high value added liquid fuel and chemicals coupling with a Fischer-Tropsch (F-T) process. In other words, this process can both improve supply of liquid fuel and eliminate global warming issues. Since deactivation of catalysts is the major obstacle for commercialization of this approach, deep understanding of this process and d
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Pegios, Nikolaos [Verfasser], Regina [Akademischer Betreuer] Palkovits, and Matthias [Akademischer Betreuer] Wessling. "Ni-based catalysts for the dry reforming of methane / Nikolaos Pegios ; Regina Palkovits, Matthias Weßling." Aachen : Universitätsbibliothek der RWTH Aachen, 2018. http://d-nb.info/117652805X/34.

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Buchteile zum Thema "Ni-Based catalysts"

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Hofmann, Peter, and Michael E. Tauchert. "Ligand Design and Mechanistic Studies for Ni-Catalyzed Hydrocyanation and 2-Methyl-3-Butenenitrile Isomerization Based upon Rh-Hydroformylation Research." In Molecular Catalysts. Wiley-VCH Verlag GmbH & Co. KGaA, 2014. http://dx.doi.org/10.1002/9783527673278.ch8.

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Gajewy, Jadwiga, Daniel Łowicki, and Marcin Kwit. "From Noble Metals to Fe-, Co-, and Ni-based Catalysts: A Case Study of Asymmetric Reductions." In Chiral Lewis Acids in Organic Synthesis. Wiley-VCH Verlag GmbH & Co. KGaA, 2017. http://dx.doi.org/10.1002/9783527802142.ch6.

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The Luong, Nguyen, Tran Van Hoang, Pham Minh Tuan, and Le Anh Tuan. "Thermal Efficiency and Exhaust Emission of an SI Engine Using Hydrogen Enriched Gas from Exhaust Gas Fuel Reforming Based on Ni-Cu/Al2O3 Catalysts." In The AUN/SEED-Net Joint Regional Conference in Transportation, Energy, and Mechanical Manufacturing Engineering. Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-1968-8_79.

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He, Shiqi. "Ni-based catalyst for phenol and its derivative selective hydrodeoxygenation." In Advances in Applied Chemistry and Industrial Catalysis. CRC Press, 2022. http://dx.doi.org/10.1201/9781003308553-46.

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Yamanaka, Ichiro, and Yuta Nabae. "Direct Oxidation of Dry Methane by Pd-Ni Synergy Catalyst Supported on Lanthanum Chromite Based Anode." In Advances in Science and Technology. Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/3-908158-01-x.2067.

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Liu, Jing, and Jiandu Lei. "Hydroprocessing Catalysts: Inexpensive Ni-Based Nonsulfided Catalysts." In Catalytic Science Series. WORLD SCIENTIFIC (EUROPE), 2018. http://dx.doi.org/10.1142/9781786344847_0003.

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Dantas, Sandra C., Janaína C. Escritori, Ricardo R. Soares, and Carla E. Hori. "Ni/CeZrO2-based catalysts for H2 production." In Studies in Surface Science and Catalysis. Elsevier, 2007. http://dx.doi.org/10.1016/s0167-2991(07)80179-0.

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Yartys, V., I. Zavaliy, A. Kytsya, et al. "Ni-, Co- and Pt-based nanocatalysts for hydrogen generation via hydrolysis of NaBH4." In HYDROGEN BASED ENERGY STORAGE: STATUS AND RECENT DEVELOPMENTS. Institute for Problems in Materials Science, 2021. http://dx.doi.org/10.15407/materials2021.094.

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Ni-, Co- and Pt-based nanostructures were prepared via different physical-chemical methods and tested as the catalysts of hydrolysis of NaBH4. Ni-Co bimetallic nanoparticles with different Ni-Co ratios were synthesized by the modified polyol method via the reduction of in situ precipitated slurries of Ni and Co hydroxides by hydrazine in ethylene glycol solutions. It was found that a Ni- Co nanoparticles with the equal Ni/Co content and mean size of 130 nm are a more active catalyst as compared to Ni75Co25 and Ni25Co75 nanopowders and provide a constant rate of hydrogen evolution up to the full conversion of NaBH4. Zeolite supported Ni- and Co-based nanostructures (Ni-Z and Co-Z) as a convenient in use alternative to the metallic nanoparticles were synthesized via two-stage procedure consisted of adsorption of Ni2+ or Co2+ ions by zeolite from the aqueous solutions followed by the reduction of the adsorbed cations by NaBH4. Using SEM and EDX it was found that such method of synthesis provide the uniform distribution of 50 – 100 nm metallic nanopaticles both on the surface and in the bulk of the carrier due to the high cation-exchange capacity of the aluminosilicates. It was found that Co-Z catalyst is more active compared to Ni-Z and in studied conditions provides the H2 evolution rate close to 1450 mL/min per 1 g of precipitated metal. Various Pt-based nanocomposites were obtained by polyol synthesis and subsequently deposited on the carriers (carbon cloth or cordierite) as well as via a platinum electrodeposition on the titanium crump. It was found that the most efficient catalyst of the hydrolysis of NaBH4 is a cordierite-supported nanodispersed Pt which is able to maintain operation of a 30 W battery of fuel cells for 9-10 hours when using for the hydrolysis 1.1 L of 10 % NaBH4 solution.
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MURATA, S., N. HATANAKA, H. INOUE, K. KIDENA, and M. NOMURA. "CO2 Reforming of Methane Catalyzed by Ni-Loaded Zeolite-Based Catalysts." In Greenhouse Gas Control Technologies - 6th International Conference. Elsevier, 2003. http://dx.doi.org/10.1016/b978-008044276-1/50235-x.

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Wang, Shaobin, and G. Q. (Max) Lu. "Reaction kinetics and deactivation of Ni-based catalysts in CO2 reforming of methane." In Reaction Engineering for Pollution Prevention. Elsevier, 2000. http://dx.doi.org/10.1016/b978-044450215-5/50080-9.

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Konferenzberichte zum Thema "Ni-Based catalysts"

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"Syngas production via combined dry and steam reforming methane over Ni-based catalyst: A review." In Sustainable Processes and Clean Energy Transition. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902516-3.

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Abstract. Global energy consumption has eventually increased as a result of the growing world population. Various problems arise as a result. The accumulation of greenhouse gases (GHGs), which led to a shift in the world's climate, is the most problematic. Combined dry and steam reforming of methane (CDRSM) is a highly advantageous method since it uses two of the most significant GHGs, CH4 and CO2, to produce syngas, an intermediate product to produce valuable fuels. Ni-based catalysts are inexpensive, compared to many noble metals, and exhibit good reaction activity. However, deactivation, co
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Ramis, Gianguido, Guido Busca, Tania Montanari, Michele Sisani, and Umberto Costantino. "Ni-Co-Zn-Al Catalysts From Hydrotalcite-Like Precursors for Hydrogen Production by Ethanol Steam Reforming." In ASME 2010 8th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2010. http://dx.doi.org/10.1115/fuelcell2010-33034.

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A series of well crystallized Ni-Co-Zn-Al LDHs materials has been prepared by the urea hydrolysis method as precursors of mixed oxide catalysts for the Ethanol Steam Reforming (ESR) reaction. The calcination of the layered precursors gives rise to high surface area mixed oxides, mainly a mixture of rock-salt phase (NiO), wurtzite phase (ZnO) and spinel phase. Both precursors and mixed oxides have been throughtfully characterized and the steam reforming of ethanol has been investigated over the calcined catalysts in flow reactor and in-situ FT-IR experiments. The data here reported provide evid
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Li, Hangjie, Dongming Shen, Xikun Gai, et al. "Influence of Ni based catalysts on CH4-CO2 reforming reaction." In 5th International Conference on Advanced Design and Manufacturing Engineering. Atlantis Press, 2015. http://dx.doi.org/10.2991/icadme-15.2015.161.

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Mikhailov, Stepan, Mikhail Sulman, Valentina Matveeva, Alexander Sidorov, and Valentin Doluda. "N-METHYL-D-GLUCOSE AMINE SYNTHESIS OVER NI BASED CATALYSTS." In 20th International Multidisciplinary Scientific GeoConference Proceedings SGEM 2020. STEF92 Technology, 2020. http://dx.doi.org/10.5593/sgem2020/4.1/s17.016.

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Shirzadi Jahromi, Hassan, Shivi Saxena, Sudharsan Sridhar, Muralidhar K. Ghantasala, Ramakrishna Guda, and Elena A. Rozhkova. "Development of Nickel-ZIF-8 Doped Nitrogen Reduced Graphene Oxide Catalytic Materials for PEM Fuel Cell." In ASME 2023 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/imece2023-113169.

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Abstract This paper presents the results of our investigation on new catalyst materials for Proton-exchange membrane (PEM) fuel cells. The sluggish kinetics of the oxygen reduction reaction (ORR) and poor electrochemical durability of platinum-based catalysts necessitated the study of new materials. Recently, pyrolytic transition metal nitrogen-carbon material (M-N-C) based catalysts have gained considerable attention for their unique electronic structure and other physical properties, which can facilitate better ionic and electronic conductivities. Specifically, nickel-nitrogen-carbon (Ni-N-C
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Das, Randip K., B. B. Ghosh, Souvik Bhattacharyya, and Maya DuttaGupta. "Catalytic Control of SI Engine Emissions Over Ion-Exchanged X-Zeolites." In ASME 1997 Turbo Asia Conference. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/97-aa-077.

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Three catalysts based on X-zeolite have been developed by exchanging its Na+ ion with Copper, Iron and Nickel metal ions and tested in a SI engine exhaust for a wide range of exhaust and operating conditions. Of the three catalysts, the Cu-X catalyst exhibits the best NOx and CO conversion performance while Ni-X shows slightly better performance compared to the Fe-X catalyst at any catalyst temperature. Unlike noble metals, the doped X-zeolite catalysts, studied here, exhibit significant NOx reduction for a wide λ range and exhibit a slow rate of decrease with increase in λ ratio. Back pressur
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Xia, Xiaoqiang, Hui Chen, Yadong Bi, and Jianli Hu. "Deoxygenation of methyl laurate over Ni based catalysts: Influence of supports." In 2ND INTERNATIONAL CONFERENCE ON MATERIALS SCIENCE, RESOURCE AND ENVIRONMENTAL ENGINEERING (MSREE 2017). Author(s), 2017. http://dx.doi.org/10.1063/1.5005212.

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Simanullang, Wiyanti Fransisca. "Highly active Si-decorated Ni-alloy based catalysts for acetylene hydrogenation." In XVII MEXICAN SYMPOSIUM ON MEDICAL PHYSICS. AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0173306.

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Khader, Mahmoud M., Mohammed J. Al Marri, Sardar Ali, et al. "Catalytic evaluation of Ni-based nano-catalysts in dry reformation of methane." In 2017 IEEE 17th International Conference on Nanotechnology (IEEE-NANO). IEEE, 2017. http://dx.doi.org/10.1109/nano.2017.8117488.

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Mesa, Camilo A., Roser Fernández-Climent, Felipe Garcés-Pineda, José R. Galán-Mascarós, and Sixto Gimenez. "Operando mechanistic characterisation of Cu- and Ni-based catalysts for water splitting." In MATSUS Fall 2023 Conference. FUNDACIO DE LA COMUNITAT VALENCIANA SCITO, 2023. http://dx.doi.org/10.29363/nanoge.matsus.2023.368.

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Berichte der Organisationen zum Thema "Ni-Based catalysts"

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Gunther Dieckmann. Development of Ni-based Sulfur Resistant Catalyst for Diesel Reforming. Office of Scientific and Technical Information (OSTI), 2006. http://dx.doi.org/10.2172/890744.

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