Enhanced coke suppression by using phosphate-zirconia supported nickel catalysts under dry methane reforming conditions |
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| Affiliation: | 1. Chemical Engineering Department, College of Engineering, King Saud University, P.O. Box 11421, Riyadh, Saudi Arabia;2. CNR-ITAE, Institute for Advanced Energy Technologies “N. Giordano”, Via S. Lucia Sopra Contesse, N. 5 98126 Messina (ME), Italy;1. Department of Chemical and Biomolecular Engineering, National University of Singapore, 117585, Singapore;2. Institute of Catalysis, Department of Chemistry, Zhejiang University, 310028, China;3. Guizhou Institute of Technology, School of Chemical Engineering, Guiyang, 550003, China;1. Chemical Engineering Department, College of Engineering, King Saud University, P.O. Box 800, Riyadh, 11421, Saudi Arabia;2. Leibniz-Institut für Katalyse, Albert-Einstein-Strasse 29A, 18059, Rostock, Germany;3. School of Chemistry and Chemical Engineering, Queen''s University Belfast, Belfast BT9 5AG, Northern Ireland, UK;1. AGH University of Science and Technology, Faculty of Energy and Fuels, Department of Fuels Technology, al.A. Mickiewicza 30, 30-059, Kraków, Poland;2. Sorbonne Universites, UPMC, Univ. Paris 6, CNRS, UMR 7190, Institut Jean Le Rond d’Alembert, 2 Place de la Gare de Ceinture, 78210 Saint-Cyr-L’Ecole, France;1. Université de Toulouse, IMT Mines Albi, UMR CNRS 5302, Centre RAPSODEE, Campus Jarlard, F-81013, Albi Cedex 09, France;2. Institute of Research and Development, Duy Tan University, Da Nang 550000, Viet Nam;3. Biomass Technology Laboratory, Department of Chemical and Biotechnological Engineering, Université de Sherbrooke, Sherbrooke, Québec, Canada, J1K 2R1;4. PRAYON S.A., Rue J. Wauters, 144, B-4480, Engis, Belgium |
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| Abstract: | Ni based phosphate zirconium catalysts were prepared by impregnation technique and used under CH4 dry reforming conditions. Catalysts (x%Ni/8%PO4–Zr, where x = 5, 10, 15 or 20) were characterized by nitrogen physical adsorption-desorption, X-ray diffraction, temperature programmed reduction, CO2 and NH3 temperature programmed desorption, thermal gravimetric analysis and transmission electron microscopy (TEM-EDAX). Catalysts displayed a typical mesoporous structure and different reducibility grade as a function of Ni loading, diagnostic of a different extent of metal-support interaction. Activity and stability strongly depend upon Ni loading while the best performance was observed for catalyst characterized by a Ni loading of 10 wt%. The CO2-TPD profiles of spent catalysts indicated that such catalyst had more tendency to gasify coke formed over the catalyst surface. TGA analysis of used catalysts quantitatively showed that catalysts at higher Ni loading deactivated as result of huge graphitic carbon formation on catalyst surface. On the contrary, system 10%Ni8%PO4/ZrO2 turns out to be an excellent candidate to conduct the methane reforming reaction with CO2 without coke formation at high CH4 and CO2 conversions. Phosphate play a fundamental role in promoting Ni–ZrO2 interaction which reflects in the stabilization of catalytic system against metal sintering and coke formation. |
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| Keywords: | Nickel based catalyst Coke formation Methane dry reforming |
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