Holmium promoted yttria-zirconia supported Ni catalyst for H2 production via dry reforming of methane |
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| Affiliation: | 1. Chemical Engineering Department, College of Engineering, King Saud University, P.O. Box 800, Riyadh 11421, Saudi Arabia;2. King Abdullah City for Atomic & Renewable Energy, Energy Research & Innovation Center (ERIC) in Riyadh, Riyadh 11451, Saudi Arabia;3. Department of Chemistry, Sankalchand Patel University, Visnagar, Gujarat, 384315, India;4. Petroleum Engineering Program, School of Engineering, Lebanese American University, P.O. Box 36, Byblos, Lebanon;5. Department of Chemistry, College of Sciences, University of Hail, Hail, 2440, Saudi Arabia;6. CNR-ITAE, Istituto di Tecnologie Avanzate per Energia “Nicola Giordano”, Via S. Lucia Sopra Contesse 5, 98126, Messina, Italy;7. Chemistry Department, Faculty of Science, Albaha University, Albaha, Saudi Arabia;8. Department of Chemistry, College of Science and Humanities, Prince Sattam Bin Abdulaziz University, P.O. Box 173, Al-Kharj, 11942, Saudi Arabia;9. Department of Chemistry, Indus University, Ahmedabad, Gujarat 382115 India |
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| Abstract: | Herein, a series of 5NixHo/YZr (x = 1, 2, 3, 4, 5 wt%) materials, never reported before, were tested in DRM reaction and characterized using several techniques like Nitrogen physisorption, X-ray diffraction, UV–vis and RAMAN spectroscopies, High Resolution Transmission Electron Microscopy, H2-Temperature Programmed Reduction, CO2-Temperature Programmed De-adsorption and Thermogravimetry. The incorporation of Yttria in the structure modifies pore sizes and stabilizes cubic Zirconia phases, whereas the addition of Ho as a promotor brings stable cubic zirconia, stable cubic holmium zirconium oxide phase and a wide range of reducible NiO-interacted species. In particular, an optimum Ho loading of 4 wt%, characterized by a minimum bandgap, strong suppression of RWGS reaction and maximum amount of reducible NiO-interacted species allows to achieve 84.1% H2 yield and 84.1% CO yield constantly over 420-min time on stream. The least basic sites availability over 5Ni5Ho/YZr results into inferior catalyst performance. |
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| Keywords: | Dry reforming of methane Yttria-stabilized zirconia support Ho promoter |
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