H2 evolution by water SPLITTING on Rh/La2O3 |
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| Affiliation: | 1. Laboratory of Materials and Application to the Environment, Faculty of Chemistry (USTHB), BP 32, 16111, Algiers, Algeria;2. Laboratory of Storage and Valorization of Renewable, Faculty of Chemistry (USTHB), BP 32, 16111, Algiers, Algeria;3. Université François-Rabelais de Tours, GREMAN UMR 7347 CNRS, IUT de Blois 15 Rue de la Chocolaterie, CS 2903, BP41029, Blois Cedex, France;1. Department of Metallurgical and Materials Engineering, Karadeniz Technical University, 61040, Trabzon, Turkey;2. Department of Metallurgical and Materials Engineering, Gaziantep University, 27310, Gaziantep, Turkey;3. Laboratory for Nuclear and Plasma Physics, Vin?a Institute of Nuclear Sciences, University of Belgrade, 11000 Belgrade, Serbia;4. Center of Excellence for Hydrogen and Renewable Energy Convince, Vin?a Institute of Nuclear Sciences, University of Belgrade, POB 522, 11001 Belgrade, Serbia;1. Department of Metallurgical and Materials Engineering, IIT Madras, JAML, Chennai, 600036, TN, India;2. Department of Materials Science and Metallurgical Engineering, IIT Hyderabad, Kandi, 502285, TS, India;1. State Key Laboratory of Technology in Space Cryogenic Propellants, Beijing 100028;2. North China Institute of Science and Technology, Xueyuan Road, Langfang, Hebei, 065201, China;3. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, 100081, Beijing, China;1. CAS Key Laboratory of Green Process and Engineering Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;2. National Engineering Research Center of Green Recycling for Strategic Metal Resources, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;3. University of Chinese Academy of Sciences, Beijing 100049, China;4. Zhengzhou Institute of Emerging Industrial Technology, Zhengzhou 450003, China;1. Department of Materials Science and Engineering, University of Connecticut, Storrs, CT, 06269, USA;2. Department of Mechanical Engineering, Kennesaw State University, Marietta, GA, 30060, USA;3. Nissan Motor Co., Ltd., Yokosuka, Kanagawa, Japan;4. Nissan Technical Center North America, Farmington Hills, MI, 4833, USA;1. College of Materials Science and Engineering, Liaoning Technical University, Fuxin, 123000, China;2. School of Chemistry and Environment, Beihang University, Beijing, 100191, China |
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| Abstract: | The physicochemical and electrochemical properties of rhodium catalysts supported on La2O3 denoted XRhLa (X = 1 and 5% wt. Rh) prepared by impregnation using RhCl6H2O as precursor salt were studied. The solids were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermal analysis (TG/TDA) and hydrogen chemisorption (HC) to evaluate the dispersion of the metal phase. The temperature-programmed reaction with hydrogen (H2-TPR), carbon monoxide (CO-TPR) or methane (CH4-TPR) were carried out to elucidate there effects on catalytic reaction. The adsorption and decomposition of H2O has been investigated on the surface catalysts. The number of reduced centers of lanthanum in Rh/La2O3 catalysts was measured by in situ oxidation of these centers at oxydation temperature of water (TOXtov) by water pulses according to the following reaction (Reduced centers + H2O→Oxidized center + H2). The amount of hydrogen Q(H), evolved in the reaction allows us to calculate the number of reduced centers of the support since the Rh metal is not oxidized. The results showed that although the conversion rate of water to H2 is low, the 5% wt. Rh catalyst is a promising candidate in the water adsorption and dissociation compared to the 1% wt. |
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| Keywords: | Impregnation Catalysis Rhodium Lanthanum oxidation (by steam) |
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