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Artykuły w czasopismach na temat „Hydrolytic oxidation of organosilanes”

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Data publikacji: 6 września 2023

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1

Teo, Alan Kay Liang, i Wai Yip Fan. "Catalytic hydrogen evolution from hydrolytic oxidation of organosilanes with silver nitrate catalyst". RSC Adv. 4, nr 71 (2014): 37645–48. http://dx.doi.org/10.1039/c4ra05669h.

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Liang Teo, Alan Kay, i Wai Yip Fan. "A novel iron complex for highly efficient catalytic hydrogen generation from the hydrolysis of organosilanes". Chem. Commun. 50, nr 54 (2014): 7191–94. http://dx.doi.org/10.1039/c4cc02852j.

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3

Ison, Elon A., Rex A. Corbin i Mahdi M. Abu-Omar. "Hydrogen Production from Hydrolytic Oxidation of Organosilanes Using a Cationic Oxorhenium Catalyst". Journal of the American Chemical Society 127, nr 34 (sierpień 2005): 11938–39. http://dx.doi.org/10.1021/ja053860u.

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Shankar, Ravi, Bhawana Jangir i Asmita Sharma. "Palladium nanoparticles anchored on polymer vesicles as Pickering interfacial catalysts for hydrolytic oxidation of organosilanes". New Journal of Chemistry 41, nr 16 (2017): 8289–96. http://dx.doi.org/10.1039/c7nj01314k.

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The self-assembly of functional polymer vesicles embedded with PdNPs at water–chloroform interfaces provides a novel catalytic route for the synthesis of poly(hydrosiloxane)s, H2RSi[OSiRH]nOSiRH2.
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5

Lee, Myunghee, Sangwon Ko i Sukbok Chang. "Highly Selective and Practical Hydrolytic Oxidation of Organosilanes to Silanols Catalyzed by a Ruthenium Complex". Journal of the American Chemical Society 122, nr 48 (grudzień 2000): 12011–12. http://dx.doi.org/10.1021/ja003079g.

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Lee, Myunghee, Sangwon Ko i Sukbok Chang. "ChemInform Abstract: Highly Selective and Practical Hydrolytic Oxidation of Organosilanes to Silanols Catalyzed by a Ruthenium Complex." ChemInform 32, nr 16 (17.04.2001): no. http://dx.doi.org/10.1002/chin.200116168.

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Shankar, Ravi, Bhawana Jangir i Asmita Sharma. "A novel synthetic approach to poly(hydrosiloxane)s via hydrolytic oxidation of primary organosilanes with a AuNPs-stabilized Pickering interfacial catalyst". RSC Advances 7, nr 1 (2017): 344–51. http://dx.doi.org/10.1039/c6ra25557d.

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Chen, Xi-Huai, Yuan Deng, Kezhi Jiang, Guo-Qiao Lai, Yong Ni, Ke-Fang Yang, Jian-Xiong Jiang i Li-Wen Xu. "Neighboring Acetal-Assisted Brønsted-Acid-Catalyzed Si-H Bond Activation: Divergent Synthesis of Functional Siloxanes through Silylation and Hydrolytic Oxidation of Organosilanes". European Journal of Organic Chemistry 2011, nr 9 (11.02.2011): 1736–42. http://dx.doi.org/10.1002/ejoc.201001532.

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9

Chen, Xi-Huai, Yuan Deng, Kezhi Jiang, Guo-Qiao Lai, Yong Ni, Ke-Fang Yang, Jian-Xiong Jiang i Li-Wen Wu. "ChemInform Abstract: Neighboring Acetal-Assisted Broensted-Acid-Catalyzed Si-H Bond Activation: Divergent Synthesis of Functional Siloxanes Through Silylation and Hydrolytic Oxidation of Organosilanes." ChemInform 42, nr 28 (16.06.2011): no. http://dx.doi.org/10.1002/chin.201128180.

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10

Lee, Ting Yan, Li Dang, Zhongyuan Zhou, Chi Hung Yeung, Zhenyang Lin i Chak Po Lau. "Nonclassical Ruthenium Silyl Dihydride Complexes TpRu(PPh3)(η3-HSiR3H) [Tp = Hydridotris(pyrazolyl)borate]: Catalytic Hydrolytic Oxidation of Organosilanes to Silanols with TpRu(PPh3)(η3-HSiR3H)". European Journal of Inorganic Chemistry 2010, nr 36 (9.11.2010): 5675–84. http://dx.doi.org/10.1002/ejic.201000951.

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11

Na, Youngim, Chongmok Lee, Jae Youn Pak, Kuk Hwa Lee i Sukbok Chang. "Electrochemistry as a correlation tool candidate with catalytic activities in Ru-catalyzed hydrolytic oxidation of organosilane". Tetrahedron Letters 45, nr 42 (październik 2004): 7863–65. http://dx.doi.org/10.1016/j.tetlet.2004.08.154.

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12

Besnard, Romain, Guilhem Arrachart, Julien Cambedouzou i Stéphane Pellet-Rostaing. "Structural study of hybrid silica bilayers from “bola-amphiphile” organosilane precursors: catalytic and thermal effects". RSC Advances 5, nr 71 (2015): 57521–31. http://dx.doi.org/10.1039/c5ra06944k.

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13

Limnios, Dimitris, i Christoforos G. Kokotos. "Organocatalytic Oxidation of Organosilanes to Silanols". ACS Catalysis 3, nr 10 (11.09.2013): 2239–43. http://dx.doi.org/10.1021/cs400515w.

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14

Khokhlova, T. D., Yu S. Nikitin i A. L. Detistova. "Modification of Silicas and Their Investigation by Dye Adsorption". Adsorption Science & Technology 15, nr 5 (maj 1997): 333–40. http://dx.doi.org/10.1177/026361749701500501.

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Various silicas (silica gel, silochrome, alumosilica, Aerosil and quartz) were modified by dehydroxylation, calcium hydroxide, aluminium chloride and organosilanes with hydrophobic and aminopropyl groups. The surface characteristics of the modified materials were evaluated by means of basic and acid dye adsorption from aqueous solution. The degree of modification, the hydrolytic stability of the organosilyl silicas and the rehydroxylation rate of the dehydroxylated silicas were determined via the kinetics of dye adsorption and their respective isotherms.
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15

Lee, Youngjun, Dong Seomoon, Sundae Kim, Hoon Han, Sukbok Chang i Phil Ho Lee. "Highly Efficient Iridium-Catalyzed Oxidation of Organosilanes to Silanols". Journal of Organic Chemistry 69, nr 5 (marzec 2004): 1741–43. http://dx.doi.org/10.1021/jo035647r.

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16

Vakhneev, S. N., i Minggong Sha. "Preparation and Characterization of Magnetite – Silica Core – Shell Nanoparticles". International Journal of Circuits, Systems and Signal Processing 15 (15.09.2021): 1457–63. http://dx.doi.org/10.46300/9106.2021.15.158.

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In this study, two types of ligands were introduced onto the surface of magnetite nanoparticles by hydrolysis and condensation of organosilicon reagents: organosilane-tetraethoxysilane (TEOS) and aminoorganosilane - aminopropyltriethoxysilane (APTES). It is shown that coatings based on SiO2 solve a double problem: first, they prevent the aggregation of nanoparticles and the oxidation of magnetite; secondly, they allow the surface to be modified with various specific ligands for biomedical applications due to terminal groups. It was shown, that after the modification of TEOS and APTES (in argon and in air), the Fe3O4 content decreases to 66, 42, and 36%, respectively. The formation of a silicon framework on the magnetite surface due to Fe-O-Si and Si-O-Si bonds was determined by IR spectroscopy. The identification of surface amino groups is complicated due to the superposition of absorption bands of NH2- and OH-groups. This opens new prospective for creation of tailored nanocomposites containing magnetite nanoparticles. These materials can be further used as sorbents for various applications.
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17

Gitis, Vitaly, Rolf Beerthuis, N. Raveendran Shiju i Gadi Rothenberg. "Organosilane oxidation by water catalysed by large gold nanoparticles in a membrane reactor". Catal. Sci. Technol. 4, nr 7 (2014): 2156–60. http://dx.doi.org/10.1039/c3cy00506b.

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Go large! Surprisingly, “large” gold nanoparticles (6–18 nm in diameter) are just as effective as small ones in catalysing the oxidation of organosilanes to silanols. These catalysts are easily separated using ultrafiltration ceramic membranes.
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18

Li, Huanhuan, Lei Chen, Peigao Duan i Wuyuan Zhang. "Highly Active and Selective Photocatalytic Oxidation of Organosilanes to Silanols". ACS Sustainable Chemistry & Engineering 10, nr 14 (1.04.2022): 4642–49. http://dx.doi.org/10.1021/acssuschemeng.2c00038.

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19

Kim, Jong-Ho, Sayed Mukit Hossain, Hui-Ju Kang, Heeju Park, Leonard Tijing, Geun Woo Park, Norihiro Suzuki i in. "Hydrophilic/Hydrophobic Silane Grafting on TiO2 Nanoparticles: Photocatalytic Paint for Atmospheric Cleaning". Catalysts 11, nr 2 (2.02.2021): 193. http://dx.doi.org/10.3390/catal11020193.

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In this study, anatase titania was utilized to prepare a durable photocatalytic paint with substantially enhanced photoactivity towards NO oxidation. Consequently, to alleviate the choking effect of photocatalytic paint and incorporate self-cleaning properties, the parent anatase titania was modified with Al(OH)3 and a number of organosilane (tetraethyl orthosilicate, propyltrimethoxysilane, triethoxy(octadecyl)silane, and trimethylchlorosilane) coatings. A facile hydrolysis approach in ethanol was employed to coat the parent titania. To facilitate uniform dispersion in photocatalytic paint and strong bonding with the prevailing organic matrix, it is necessary to avail both hydrophobic and hydrophilic regions on the titania surface. Therefore, during the preparation of modified titania, the weight proportion of the total weight of alkyl silane and trimethylchlorosilane was adjusted to a ratio of 1:1. As the parent titania has few hydrophilic portions on the surface, tetraethyl orthosilicate was coated with an organic silane having an extended alkyl group as a hydrophobic group and tetraethyl orthosilicate as a hydrophilic group. When these two silane mixtures are hydrolyzed simultaneously and coated on the surface of parent titania, a portion containing a large amount of tetraethyl orthosilicate becomes hydrophilic, and a part containing an alkyl silane becomes hydrophobic. The surface morphology and the modified titania’s optical attributes were assessed using X-ray powder diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), UV-Vis diffuse reflectance spectroscopy (DRS), and electrochemical impedance spectroscopy (EIS) analysis. Based on the advanced characterizations, the NO removal mechanism of the modified titania is reported. The modified titania coated at 20 wt.% on the ceramic substrate was found to remove ~18% of NO under one h of UV irradiation. An extensive UV durability test was also carried out, whereby the coated surface with modified titania was exposed to 350 W/m2 of UV irradiance for 2 weeks. The results indicated that the coated surface appeared to preserve the self-cleaning property even after oil spraying. Hence, facile hydrolysis of multiple organosilane in ethanol could be a viable approach to design the coating on anatase titania for the fabrication of durable photoactive paint.
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20

Pustahija, Lucija, i Wolfgang Kern. "Surface Functionalization of (Pyrolytic) Carbon—An Overview". C 9, nr 2 (10.04.2023): 38. http://dx.doi.org/10.3390/c9020038.

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This review focuses on techniques for modifying the surface of carbon that is produced from sustainable resources, such as pyrolytic carbon. Many of these materials display high specific surface area and fine particle distribution. Functionalization of a surface is a commonly used approach in designing desired surface properties of the treated material while retaining its bulk properties. Usually, oxidation is a primary step in carbon functionalization. It can be performed as wet oxidation, which is a type of chemical surface modification. Wet oxidation is usually performed using nitric acid and hydrogen peroxide, as well as using hydrothermal and solvothermal oxidation. On the other side, dry oxidation is representative of physical surface modification. This method is based on corona discharge and plasma oxidation which are promising methods that are in line with green chemistry approaches. Whilst the oxidation of the carbon surface is a well-known method, other chemical modification techniques, including cycloadditions and various radical reactions on graphene layers, are presented as an alternative approach. Regarding secondary functionalization, coupling organosilanes to activated carbon is a common technique. Organosilanes bearing reactive groups present a bridge between inorganic species and polymer systems, e.g., epoxy and polyurethane resins, and facilitate the use of carbonaceous materials as reinforcing components for polymers and thermosetting resins. Along with the presented functionalization methods, this review also provides an overview of new applications of modified (i.e., functionalized) carbon materials, e.g., for the building industry, wastewater treatment, semiconducting materials and many more.
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21

Li, Zhiwen, Congcong Zhang, Jing Tian, Zhonghua Zhang, Xiaomei Zhang i Yi Ding. "Highly selective oxidation of organosilanes with a reusable nanoporous silver catalyst". Catalysis Communications 53 (sierpień 2014): 53–56. http://dx.doi.org/10.1016/j.catcom.2014.04.009.

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22

Manaenkov, Oleg, Olga Kislitsa, Ekaterina Ratkevich, Yuriy Kosivtsov, Valentin Sapunov i Valentina Matveeva. "Hydrolytic Oxidation of Cellobiose Using Catalysts Containing Noble Metals". Reactions 3, nr 4 (16.11.2022): 589–601. http://dx.doi.org/10.3390/reactions3040039.

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Studies of the processes of the hydrolytic oxidation of disaccharides are the first step towards the development of technologies for the direct conversion of plant polysaccharides, primarily cellulose, into aldonic and aldaric acids, which are widely used in chemical synthesis and various industries. In this study, heterogeneous catalysts based on a porous matrix of hypercrosslinked polystyrene (HPS) and noble metals (Pt, Au, Ru, and Pd) were proposed for the hydrolytic oxidation of cellobiose to gluconic and glucaric acids. The catalysts were characterized using low-temperature nitrogen adsorption, hydrogen chemisorption, electron microscopy, and other methods. In particular, it was shown that the Pt-containing catalyst contained, on average, six times more active centers on the surface, which made it more promising for use in this reaction. At a temperature of 145 °C, an O2 pressure of 5 bars, and a substrate/catalyst weight ratio of 4/1, the yields of gluconic and glucaric acids reached 21.6 and 63.4%, respectively. Based on the data obtained, the mathematical model of the cellobiose hydrolytic oxidation kinetics in the presence of 3% Pt/HPS MN270 was developed, and the parameter estimation was carried out. The formal description of the kinetics of cellobiose hydrolytic oxidation was obtained.
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23

Asao, Naoki, Yoshifumi Ishikawa, Naoya Hatakeyama, Menggenbateer, Yoshinori Yamamoto, Mingwei Chen, Wei Zhang i Akihisa Inoue. "Nanostructured Materials as Catalysts: Nanoporous-Gold-Catalyzed Oxidation of Organosilanes with Water". Angewandte Chemie International Edition 49, nr 52 (29.11.2010): 10093–95. http://dx.doi.org/10.1002/anie.201005138.

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Asao, Naoki, Yoshifumi Ishikawa, Naoya Hatakeyama, Menggenbateer, Yoshinori Yamamoto, Mingwei Chen, Wei Zhang i Akihisa Inoue. "Nanostructured Materials as Catalysts: Nanoporous-Gold-Catalyzed Oxidation of Organosilanes with Water". Angewandte Chemie 122, nr 52 (29.11.2010): 10291–93. http://dx.doi.org/10.1002/ange.201005138.

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Lv, Haiping, Ronibala Devi Laishram, Jiayan Li, Guangrui Shi, Weiqing Sun, Jianbin Xu, Yong Yang, Yang Luo i Baomin Fan. "Nickel(0) catalyzed oxidation of organosilanes to disiloxanes by air as an oxidant". Tetrahedron Letters 60, nr 14 (kwiecień 2019): 971–74. http://dx.doi.org/10.1016/j.tetlet.2019.03.002.

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Li, Zhiwen, Xiaohong Xu i Xiaomei Zhang. "Oxidation of Organosilanes with Nanoporous Copper as a Sustainable Non-Noble-Metal Catalyst". ChemPhysChem 16, nr 8 (24.03.2015): 1603–6. http://dx.doi.org/10.1002/cphc.201500111.

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Qing, Guoping, i Chunming Cui. "Controlled synthesis of cyclosiloxanes by NHC-catalyzed hydrolytic oxidation of dihydrosilanes". Dalton Transactions 46, nr 27 (2017): 8746–50. http://dx.doi.org/10.1039/c6dt04882j.

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Jin, Zhu, Liang Wang, Erik Zuidema, Kartick Mondal, Ming Zhang, Jian Zhang, Chengtao Wang i in. "Hydrophobic zeolite modification for in situ peroxide formation in methane oxidation to methanol". Science 367, nr 6474 (9.01.2020): 193–97. http://dx.doi.org/10.1126/science.aaw1108.

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Selective partial oxidation of methane to methanol suffers from low efficiency. Here, we report a heterogeneous catalyst system for enhanced methanol productivity in methane oxidation by in situ generated hydrogen peroxide at mild temperature (70°C). The catalyst was synthesized by fixation of AuPd alloy nanoparticles within aluminosilicate zeolite crystals, followed by modification of the external surface of the zeolite with organosilanes. The silanes appear to allow diffusion of hydrogen, oxygen, and methane to the catalyst active sites, while confining the generated peroxide there to enhance its reaction probability. At 17.3% conversion of methane, methanol selectivity reached 92%, corresponding to methanol productivity up to 91.6 millimoles per gram of AuPd per hour.
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Popova, O. V., T. A. Mal’tseva, E. A. Mar’eva i K. S. Tarasenko. "Electrochemical Oxidation of Hydrolytic Lignins in Fluoride-Containing Aqueous Electrolytes". Russian Journal of General Chemistry 88, nr 6 (czerwiec 2018): 1331–36. http://dx.doi.org/10.1134/s1070363218060440.

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D’Auria, Maurizio, Giacomo Mauriello i Rocco Racioppi. "An unusual oxidation of thiazol-2-ylmethanol in hydrolytic conditions". Journal of the Chemical Society, Perkin Transactions 1, nr 1 (1999): 37–40. http://dx.doi.org/10.1039/a807481j.

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31

Bezbradica, Dejan, Jasmina Corovic, Radivoje Prodanovic, Nenad Milosavic i Zorica Knezevic. "Covalent immobilization of lipase from Candida rugosa on Eupergit®". Acta Periodica Technologica, nr 36 (2005): 179–86. http://dx.doi.org/10.2298/apt0536179b.

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An approach is presented for the stable covalent immobilization of Upase from Candida rugosa on Eupergit? with a high retention of hydrolytic activity. It comprises covalent bonding via lipase carbohydrate moiety previously modified by periodate oxidation, allowing a reduction in the involvement of the enzyme functional groups that are probably important in the catalytic mechanism. The hydrolytic activities of the lipase immobilized on Eupergif1 by two conventional methods (via oxirane group and via glutaralde-hyde) and with periodate method were compared. Results of lipase assays suggest that periodate method is superior for lipase immobilization on Eupergit? among methods applied in this study with respect to both, yield of immobilization and hydrolytic activity of the immobilized enzyme.
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32

Ishimoto, Ryo, Keigo Kamata i Noritaka Mizuno. "Highly Selective Oxidation of Organosilanes to Silanols with Hydrogen Peroxide Catalyzed by a Lacunary Polyoxotungstate". Angewandte Chemie International Edition 48, nr 47 (21.10.2009): 8900–8904. http://dx.doi.org/10.1002/anie.200904694.

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Ishimoto, Ryo, Keigo Kamata i Noritaka Mizuno. "Highly Selective Oxidation of Organosilanes to Silanols with Hydrogen Peroxide Catalyzed by a Lacunary Polyoxotungstate". Angewandte Chemie 121, nr 47 (21.10.2009): 9062–66. http://dx.doi.org/10.1002/ange.200904694.

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Манаенков, Олег Викторович, Ольга Витальевна Кислица, Валентина Геннадьевна Матвеева, Евгений Владимирович Антонов i Екатерина Алексеевна Раткевич. "HYDROLYTIC OXIDATION OF CELLOBIOSE IN THE PRESENCE OF A Pt-CONTAINING POLYMERIC CATALYST". Вестник Тверского государственного университета. Серия: Химия, nr 1(43) (13.04.2021): 7–17. http://dx.doi.org/10.26456/vtchem2021.1.1.

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В данной работе приводятся результаты исследования процесса гидролитического окисления целлобиозы (4-(β-глюкозидо)-глюкозы) в присутствии гетерогенного Pt-содержащего катализатора на основе мезопористой матрицы сверхсшитого полистирола (СПС). Исследования процессов гидролитического окисления дисахаридов являются первым шагом к разработке технологий прямой конверсии растительных полисахаридов, в первую очередь, целлюлозы, в альдоновые и альдаровые кислоты, широко использующиеся в химическом синтезе и различных областях промышленности. This work presents the results of a study of the process of hydrolytic oxidation of cellobiose (4- (β-glycoside) -glucose) in the presence of a heterogeneous Pt-containing catalyst based on a mesoporous matrix of hypercrosslinked polystyrene (HPS). Studies of the processes of hydrolytic oxidation of disaccharides are the first step towards the development of technologies for the direct conversion of plant polysaccharides, primarily cellulose, into aldonic and aldaric acids, which are widely used in chemical synthesis and various industries.
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35

Shankar, Ravi, i Nidhi Mahavar. "A catalytic study of water dispersed gold nanoparticles for the hydrolytic oxidation of diorganosilanes – en route formation of a Pickering catalyst and synthesis of tetraorganodisiloxane-1,3-diols". Dalton Transactions 49, nr 46 (2020): 16633–37. http://dx.doi.org/10.1039/d0dt03252b.

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This study unfolds the formation of a AuNP-stabilized Pickering catalyst (PIC) en route to the hydrolytic oxidation of diorganosilanes. The method offers a viable route for the synthesis of disiloxane-1,3-diols.
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Liakyn, Lyazat, Zhanar Onalbayeva, Natalya Kulenova, Gulzhan Daumova, Sergey Mamyachenkov i Olga Anisimova. "Research of the Process of Purification of Sulfate Zinc Solution from Iron Ions Using Anodic Oxidation". Metals 13, nr 1 (31.12.2022): 88. http://dx.doi.org/10.3390/met13010088.

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The possibility of using a membrane electrolytic cell for the electrochemical oxidation of Fe(II) and purification from impurities of real industrial solutions obtained by atmospheric leaching of low-grade zinc concentrates is considered. The average indicators for carrying out the electrooxidation process are given. The principal possibility of conditioning a zinc sulfate solution by hydrolytic purification with preliminary oxidation of iron in a membrane electrolytic cell with an anion-exchange membrane MA-41 TU 2255-062-05761695-2009 is considered. Carrying out direct electrooxidation of iron (II) in sulfate zinc solutions in the anode chamber of a flow membrane electrolyzer ensures good filterability of precipitates after hydrolytic precipitation of iron, since this solution does not contain Fe(II) ions, the presence of which leads to significant difficulties in the operations of separating solid and liquid phases. This makes it possible to exclude the thickening operation from the technological scheme. The degree of oxidation of iron during the test period was 99.8–99.9%. The residual concentration of iron after precipitation from solutions obtained after electrochemical oxidation in the form of oxide and hydroxide compounds was less than 0.01 g/dm3.
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Манаенков, О. В., О. В. Кислица i Ю. Ю. Косивцов. "KINETICS OF THE PROCESS OF HYDROLYTIC OXIDATION OF CELLOBIOSE TO GLUCARIC ACID". Вестник Тверского государственного университета. Серия: Химия, nr 1(51) (13.03.2023): 7–16. http://dx.doi.org/10.26456/vtchem2023.1.1.

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В работе приводятся результаты кинетического исследования процесса гидролитического окисления целлобиозы до глюкаровой кислоты в присутствии гетерогенного Pt-содержащего катализатора на основе сверхсшитого полистирола – 3 % Pt/СПС MN270. При оптимальных условиях реакции (температуре 145 °С, давлении О2 5 бар, времени реакции 2 ч и массовом соотношении субстрат/катализатор 4/1) выход глюкаровой кислоты 63,4 %. На основании полученных экспериментальных данных была предложена математическая модель процесса, являющаяся формальным описанием кинетики гидролитического окисления целлобиозы, а также произведена оценка её параметров. The paper presents the results of a kinetic study of the process of hydrolytic oxidation of cellobiose to glucaric acid in the presence of a heterogeneous Ptcontaining catalyst based on hypercrosslinked polystyrene – 3 % Pt/HPS MN270. Under optimal reaction conditions (temperature 145 °C, O2 pressure 5 bar, reaction time 2 h, and substrate/catalyst weight ratio 4/1), the yield of glucaric acid is 63.4%. Based on the experimental data obtained, a mathematical model of the process was proposed, which is a formal description of the kinetics of the hydrolytic oxidation of cellobiose, and its parameters were estimated.
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38

Rodriguez, Chloé, Alvaro Muñoz Noval, Vicente Torres-Costa, Giacomo Ceccone i Miguel Manso Silván. "Visible Light Assisted Organosilane Assembly on Mesoporous Silicon Films and Particles". Materials 12, nr 1 (3.01.2019): 131. http://dx.doi.org/10.3390/ma12010131.

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Porous silicon (PSi) is a versatile matrix with tailorable surface reactivity, which allows the processing of a range of multifunctional films and particles. The biomedical applications of PSi often require a surface capping with organic functionalities. This work shows that visible light can be used to catalyze the assembly of organosilanes on the PSi, as demonstrated with two organosilanes: aminopropyl-triethoxy-silane and perfluorodecyl-triethoxy-silane. We studied the process related to PSi films (PSiFs), which were characterized by X-ray photoelectron spectroscopy (XPS), time of flight secondary ion mass spectroscopy (ToF-SIMS) and field emission scanning electron microscopy (FESEM) before and after a plasma patterning process. The analyses confirmed the surface oxidation and the anchorage of the organosilane backbone. We further highlighted the surface analytical potential of 13C, 19F and 29Si solid-state NMR (SS-NMR) as compared to Fourier transformed infrared spectroscopy (FTIR) in the characterization of functionalized PSi particles (PSiPs). The reduced invasiveness of the organosilanization regarding the PSiPs morphology was confirmed using transmission electron microscopy (TEM) and FESEM. Relevantly, the results obtained on PSiPs complemented those obtained on PSiFs. SS-NMR suggests a number of siloxane bonds between the organosilane and the PSiPs, which does not reach levels of maximum heterogeneous condensation, while ToF-SIMS suggested a certain degree of organosilane polymerization. Additionally, differences among the carbons in the organic (non-hydrolyzable) functionalizing groups are identified, especially in the case of the perfluorodecyl group. The spectroscopic characterization was used to propose a mechanism for the visible light activation of the organosilane assembly, which is based on the initial photoactivated oxidation of the PSi matrix.
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39

Wang, Yaping, Jingkun Lu, Xinyi Ma, Yanjun Niu, Vikram Singh, Pengtao Ma, Chao Zhang, Jingyang Niu i Jingping Wang. "Synthesis, characterization and catalytic oxidation of organosilanes with a novel multilayer polyoxomolybdate containing mixed-valence antimony". Molecular Catalysis 452 (czerwiec 2018): 167–74. http://dx.doi.org/10.1016/j.mcat.2018.04.013.

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40

Ainscough, Eric W., Sidney S. Woodhouse, Andrew M. Brodie, Graham H. Freeman i Paul G. Plieger. "Insights into the Chemistry and Structural Features of the Copper(II) 2,2′-Bipyridyl–Thiosulfate System". Australian Journal of Chemistry 73, nr 1 (2020): 43. http://dx.doi.org/10.1071/ch19535.

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In this paper, we present our findings on a series of copper(ii) 2,2′-bipyridyl (bipy) complexes that inhibit the oxidation of thiosulfate, a current problem in the gold leaching process. The formation of six complexes, five of which have been structurally characterized by X-ray crystallography, illustrate a thermally induced, controllable switching between oxidation states, which in turn inhibits the oxidation of thiosulfate. These findings give further insight and understanding into the rich chemistry of the coinage metals and the hydrolytic processes involved with gold leaching.
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41

Shankar, Ravi, Asmita Sharma, Bhawana Jangir, Manchal Chaudhary i Gabriele Kociok-Köhn. "Catalytic oxidation of diorganosilanes to 1,1,3,3-tetraorganodisiloxanes with gold nanoparticle assembly at the water–chloroform interface". New Journal of Chemistry 43, nr 2 (2019): 813–19. http://dx.doi.org/10.1039/c8nj04223c.

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The synthesis of 1,1,3,3-tetraorganodisiloxanes from the hydrolytic oxidation of diorganosilanes, RR1SiH2, using AuNPs as an interfacial catalyst is described. This study provides a manifestation of the photothermal effect in enhancing the catalytic activity at ambient temperature.
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42

Rakete, Stefan, Robert Berger, Steffi Böhme i Marcus A. Glomb. "Oxidation of Isohumulones Induces the Formation of Carboxylic Acids by Hydrolytic Cleavage". Journal of Agricultural and Food Chemistry 62, nr 30 (15.07.2014): 7541–49. http://dx.doi.org/10.1021/jf501826h.

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43

D'Auria, Maurizio, Giacomo Mauriello i Rocco Racioppi. "ChemInform Abstract: An Unusual Oxidation of Thiazol-2-ylmethanol in Hydrolytic Conditions." ChemInform 30, nr 22 (15.06.2010): no. http://dx.doi.org/10.1002/chin.199922128.

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Gao, Chunmei, Jiale Chen, Boping Zhang i Lei Wang. "Effect of Chemical Structure and Degree of Branching on the Stability of Proton Exchange Membranes Based on Sulfonated Polynaphthylimides". Polymers 12, nr 3 (12.03.2020): 652. http://dx.doi.org/10.3390/polym12030652.

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Hydrolytic stability and oxidative stability are the core properties of sulfonated polynaphthylimides (SPIs) as proton exchange membranes. The chemical structure of SPIs directly influences the performance. Herein, three different series of branched SPIs were designed and prepared using 1,3,5-tris (2-trifluoromethyl-4-aminophenoxy) benzene as a trifunctional monomer and three non-sulfonated diamine monomers, such as 4,4′-oxydianiline (ODA), 2,2-bis[4-(4-aminophenoxy)phenyl]hexafluoropropane (6FODA), and 4,4′-(9-fluorenylidene)dianiline (BFDA). The effect of the chemical structure and degree of branching on SPIs properties is discussed. The results showed that by controlling the chemical structure and degree of branching, the chemical stability of SPIs changed significantly. SPI-6FODA with two ether linkages and a hydrophobic CF3 group has higher hydrolytic stability than SPI-ODA with only one ether linkage. In addition, with the increase of the introduced B3 monomer, the oxidation stability of SPI-6FODA has been greatly improved. We successfully synthesized SPIs with a high hydrolytic stability and oxidative stability.
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45

Jebli, Nejib, Wouter Debrouwer, Jan Berton, Kristof Van Hecke, Christian Stevens i Soufiane Touil. "Direct Regio- and Diastereoselective Diphosphonylation of Cyclic Enamines: One-Pot Synthesis of α,α′-Bis(diphenylphosphoryl)- and α,α′-Bis(diphenylphosphorothioyl)cycloalkanones". Synlett 28, nr 10 (8.03.2017): 1160–64. http://dx.doi.org/10.1055/s-0036-1588970.

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A straightforward regio- and diastereoselective process has been developed for the synthesis of unprecedented symmetrical trans-α,α′-bis(diphenylphosphoryl)- and α,α′-bis(diphenylphosphorothioyl)-cycloalkanones, through the reaction of cyclic enamines with excess P-chlorodiphenylphosphine in the presence of triethylamine, followed by oxidation or sulfurization and hydrolytic workup.
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46

Jin, Manman, Jinkai Wang, Bing Wang, Zhenmei Guo i Zhiguo Lv. "Highly effective green oxidation of aldehydes catalysed by recyclable tungsten complex immobilized in organosilanes-modified SBA-15". Microporous and Mesoporous Materials 277 (marzec 2019): 84–94. http://dx.doi.org/10.1016/j.micromeso.2018.10.021.

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47

Ishimoto, Ryo, Keigo Kamata i Noritaka Mizuno. "ChemInform Abstract: Highly Selective Oxidation of Organosilanes to Silanols with Hydrogen Peroxide Catalyzed by a Lacunary Polyoxotungstate." ChemInform 41, nr 11 (19.02.2010): no. http://dx.doi.org/10.1002/chin.201011177.

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Ding, Zhi Bin, Zhao Lu i Chao Zhang. "Research of Biological Phase in Contact Oxidation Pond for Jeans Washing Wastewater Biochemical Treatment". Advanced Materials Research 777 (wrzesień 2013): 247–52. http://dx.doi.org/10.4028/www.scientific.net/amr.777.247.

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The combined process of coagulation, hydrolytic acidification and contact oxidation was applied to treat the jeans washing wastewater, and the microorganism and COD concentration in the contact oxidation pond was monitored 40 consecutive days. the results showed that Vorticella, rotifers, arcellas, chironomid larvae, nematodes of the genus, changed in the number of the wastewater treatment had obvious indicating effect, activated sludge on the chromaticity of grain had obvious effect of adsorption, and flocculation particle morphological changes could also play a role in indicating.
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49

Vaniushenkova, Anna A., Elina E. Dosadina, Anna A. Hanafina, Sergey V. Kalenov, Nikolay S. Markvichev i Alexey A. Belov. "Synthesis and study of the properties of composite materials based on cellulose and chitosan containing various therapeutic agents. Part 3. Hydrolytic destruction of dressings based on dialdehydecellulose". Butlerov Communications 59, nr 8 (31.08.2019): 47–59. http://dx.doi.org/10.37952/roi-jbc-01/19-59-8-47.

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Creating systems for targeted delivery of drugs to the affected organ is one of the most promising areas for the development of systems with controlled release of the active substance. Polysaccharides are widely used as drug carriers. However, most of them are chemically inert and require preliminary functionalization in order to interact with physiologically active compounds (therapeutic agents-TA). A simple and effective method for introducing reactive groups is the periodic oxidation of the polysaccharide by the Malaprade reaction. While cellulose is insoluble in water and resistant to weak solutions of acids and alkalis, dialdehyde cellulose (DAC is the product of the periodic oxidation of cellulose) and its derivatives are destroyed in water and weakly acidic and slightly alkaline solutions. This process is called hydrolytic destruction. The kinetics of hydrolytic destruction is described by semi-logarithmic anamorphosis, which allows us to calculate the rate constants of hydrolytic destruction as the rate constant of first-order reactions. The products of hydrolytic degradation were studied by UV spectroscopy and using 3,5-dinitrosalicylic acid (DNSA). The degradation products of C and DAC were also studied by the phenol-sulfur method. From the data presented and cited earlier, it follows that when our composite material is placed in a liquid medium, the hydrolytic destruction of the drug immediately begins. What can be connected with the breakdown of both the carrier – TA bonds (DAC, C, Ct carriers) and the destruction of the carrier itself. Under the conditions of the organism, biological destruction can also join process. Biodestruction is the process of destruction (both carriers and immobilized TAs) under the action of the body's enzymes. Using IR spectroscopy, cellulose carriers were studied before and after exposure to 1/15M FB medium (pH 6.2 and 37 °C) for 48 hours. As can be seen from the data obtained, primarily for DAC samples, significant changes in the spectrum are visible in the 1800-1600 and 900 cm-1 fields. The results of experimental toxicological studies of samples of various cellulosic materials allow us to conclude that the samples studied do not have toxic, hemolytic, allergenic effects, as well as mutagenic activity.
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Sturm, Michael Toni, Erika Myers, Dennis Schober, Anika Korzin, Clara Thege i Katrin Schuhen. "Comparison of AOP, GAC, and Novel Organosilane-Based Process for the Removal of Microplastics at a Municipal Wastewater Treatment Plant". Water 15, nr 6 (17.03.2023): 1164. http://dx.doi.org/10.3390/w15061164.

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Wastewater treatment plants (WWTPs) have been identified as important point sources of micropollutants and microplastics into the environment. Existing fourth cleaning steps are designed to remove dissolved micropollutants, however do not target dispersed solids such as microplastics. Therefore, the ability of an Advanced Oxidation Process (AOP) and Granular Activated Carbon (GAC) in parallel and serial connection to remove microplastics was investigated and determined. The pilot plants were operated at the municipal WWTP Landau, Germany, a three-step biological waste treatment plant with a capacity of 80,000 population equivalents. A Nile red-based detection method was applied to quantify microplastics. Neither method showed a significant removal of microplastics. To achieve a simultaneous removal of microplastics and dissolved micropollutants, a pilot plant using organosilanes for microplastics’ removal was connected in series with the GAC. When added to the water, the organosilanes attach to the microplastics and collect them in agglomerates by chemically binding them in a water-induced sol–gel process. The pilot plant for microplastics’ removal was operated with a flow rate of 12 m3/h and a retention time of 10 min; the GAC with 2 m3/h and a retention time of 1 h. An average reduction in micropollutants by 86.2 ± 2.0% and a reduction in microplastics by 60.9 ± 27.5% was reached. Thus, there is an effective reduction in micropollutants and a significant reduction in microplastics. Further optimizations of the pilot plant are expected to result in a more stable and higher removal performance.
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