Photoassisted deposition of rhodium on platinum/titania samples as a method of preparing bimetallic catalysts |
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| Affiliation: | 1. Institute of Condensed Matter and Nanosciences (IMCN), Université catholique de Louvain (UCLouvain), Place Louis Pasteur 1, 1348 Louvain-la-Neuve, Belgium;2. Instituto de Investigaciones en Catálisis y Petroquímica, INCAPE (UNL-CONICET), Facultad de Ingeniería Química, Santiago del Estero 2829, 3000 Santa Fe, Argentina;1. College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, Henan, PR China;2. Research Centre for Combustion and Environmental Technology, Shanghai Jiao Tong University, Shanghai 200240, PR China;3. Institute of Solar Energy, Shanghai University of Electric Power, Shanghai 200090, PR China;1. State Key Laboratory of Advanced Technology for Material Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, PR China;2. Department of Science and Environmental Studies and Centre for Education in Environmental Sustainability, The Hong Kong Institute of Education, Tai Po, N.T. Hong Kong, P.R. China;3. Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia;4. Mechanical Engineering Department, Ho Polytechnic, P.O. Box HP 217, Ho, Volta Region, Ghana;1. College of Materials and Energy, Guangzhou 510642, Guangdong, China;2. College of Forestry and Landscape Architecture, South China Agricultural University, Guangzhou 510642, Guangdong, China;3. Key Laboratory of Energy Plants Resource and Utilization, Ministry of Agriculture, Key Laboratory of Biomass Energy of Guangdong Regular Higher Education Institutions, Institute of New Energy and New Materials, South China Agricultural University, Guangzhou 510642, Guangdong, China;4. Hunan Key Laboratory of Applied Environmental Photocatalysis, Changsha University, Changsha 410022, Hunan, China;1. Fuel Cell Institute, Universiti Kebangsaan Malaysia, UKM, 43600 Bangi, Selangor, Malaysia;2. US-Pakistan Center for Advanced Studies in Energy, National University of Sciences and Technology, H-12, Islamabad 44000, Pakistan;3. Centre for Materials Engineering and Smart Manufacturing, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, UKM, 43600 Bangi, Selangor, Malaysia;1. School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310018, China;2. Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, Zhejiang, 310027, China |
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| Abstract: | Rh-Pt/TiO2 samples obtained by UV illumination at room temperature in the absence of oxygen of suspensions in aqueous Rh3+ solutions of particulate 2.5 wt.-% Pt/TiO2 (previously prepared by impregnation and reduction in hydrogen), were examined by X-ray photoelectron spectroscopy and transmission and scanning transmission electron microscopy. Depending on the medium (water, 2-propanol-water, ammonia solution buffered at pH 11 with ammonium chloride or nitrate), rhodium particles (ca. 1 wt.-% loading) of various mean size and degree of reduction were found. Interestingly, rhodium was deposited on titania in neutral medium and on platinum in basic medium. These results, which demonstrate that different types of bimetallic catalysts can be prepared by photoassisted deposition, are discussed in terms of the separation of photoproduced charges and surface charge. |
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