Some aspects of metal-support strong interactions in Rh/Al2O3 catalyst under oxidising and reducing conditions |
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| Institution: | 1. Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Krakow, Poland;2. Department of Inorganic Chemistry, Fritz Haber Institute of Max Planck Society, Faradayweg 4-6, D-14195 Berlin, Germany;3. Regional Laboratory of Physicochemical Analyses and Structural Research, Jagiellonian University, Ingardena 3, 30-060 Krakow, Poland;1. Department of Chemical and Process Engineering, Bilecik Seyh Edebali University, Bilecik 11210, Turkey;2. Department of Chemical Engineering, Gazi University, Ankara 06570, Turkey;1. Centre of Polymer and Carbon Materials Polish Academy of Sciences, M. Curie-Sk?odowskiej 34, 41-819 Zabrze, Poland;2. Silesian University of Technology, Faculty of Chemistry, M. Strzody 9, 44-100 Gliwice, Poland;3. Saigon University, Faculty of Pedagogy of Natural Sciences, 273 An Duong Vuong Dis.5, HCMC, Viet Nam;4. Lodz University of Technology, Institute of General and Ecological Chemistry, Zeromskiego 116, 90-924 Lodz, Poland;5. University Pierre et Marie Curie, Paris, France;1. Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, Nanjing 211816, China;2. School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637459, Singapore;3. Institute for Advanced Study and Department of Chemistry, Nanchang University, Nanchang 330031, China;1. Università degli Studi di Genova, Dipartimento di Ingegneria Civile, Chimica e Ambientale (DICCA), Laboratorio di chimica delle superfici e catalisi, P.zzale Kennedy, 1 16129 Genova, Italy;2. Department of Chemical and Biological Engineering, Tufts University, Medford, MA, USA;3. Università degli Studi di Genova, Dipartimento di Chimica e Chimica Industriale (DCCI), Via Dodecaneso, 31 16146 Genova, Italy;1. Institute of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China;2. The Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;3. Haier Group Technique R&D Center, Qingdao 266100, China;1. Department of Chemical Engineering/School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-Ro, Nam-Gu, Pohang 790-784, Republic of Korea;2. General Motors Research and Development Planning Center, Warren, MI 48090-9055, USA |
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| Abstract: | The aim of the Letter is to elucidate the nature of metal-support interaction in the 2 wt% Rh/Al2O3 catalyst obtained by annealing Rh–O–Al xerogel at 1113 K in air.XPS, HRTEM, and XRD results reveal that during the Rh–O–Al xerogel annealing in air, rhodium incorporates into forming alumina, which results mostly in Rh4+/δ-Al2O3 solid solution formation.However, in the course of the catalyst reduction at 773 with H2 and at 823 K with CH4 the Rh4+/δ-Al2O3 solid solution transforms into Rh–Al alloy. The islands of rhodium form on the surface of the Rh–Al alloy nanocrystallites if the reduction is slow enough. |
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