Oxy-methane reforming over high temperature stable NiCoMgCeOx and NiCoMgOx supported on zirconia–haffnia catalysts: Accelerated sulfur deactivation and regeneration |
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| Affiliation: | 1. Chemical Engineering and Process Development Division, National Chemical Laboratory, Pune 411 008, India;2. 5518 Colony Court, Bartlesville 74006, USA;1. Universidade de São Paulo (USP), Escola Politécnica, Department of Chemical Engineering, Av. Prof. Luciano Gualberto, Travessa 3, no. 380, 05508-010, São Paulo, Brazil;2. Universidade Federal do Rio de Janeiro (UFRJ), COPPE, NUCAT, Brazil;1. Catalysis Science and Technology Research Centre, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia;2. Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia;3. Institute of Advanced Technology, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia;1. Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, De Rondom 70, Eindhoven, The Netherlands;2. Department of Energy, Politecnico di Milano, Via Lambruschini 4, Milano, Italy;1. Clean Energy Research Center, Korea Institute of Science and Technology, 5, Hwarang-ro 14-gil, Seongbuk-gu, Seoul, South Korea;2. Clean Energy & Chemical Engineering, University of Science and Technology, 217, Gajeong-ro, Yuseong-gu, Daejeon, South Korea;3. Department of Chemical & Biological engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul, South Korea |
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| Abstract: | NiCoMgOx and NiCoMgCeOx on commercial low surface area zirconia–haffnia catalysts have unusually high thermal stability (?2000 °C) for syngas generation via the methane partial oxidation process (J. Catal., 233, 36, 2005). Herein we report the results on accelerated sulfur deactivation (0.74 mol% sulfur in feed) and corresponding regeneration (at 800 °C in 1:1 O2 + N2 flow) over these catalysts. The NiCoMgCeOx catalyst, due to a larger mobility of lattice oxygen, showed a considerably higher resistance to sulfur poisoning; the higher mobility of the lattice oxygen in case of the NiCoMgCeOx catalyst may be related to the presence of CeO2. During the deactivation process, the selectivity for H2 was decreased to a much greater extent than that for CO. Regeneration studies showed that even after complete deactivation of the catalysts, the original activity/selectivity of both the catalysts could be completely restored after a simple regeneration process. Based on their exceptionally high thermal stability, high activity/selectivity and easily regenerability, the NiCoMgOx and NiCoMgCeOx catalysts appear to be very promising candidates for the CPOM process. |
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