02179nas a2200241 4500008004100000022001400041245016900055210006900224260007300293300001200366490000600378520124700384653001701631653002801648653001201676653002201688653001701710653001101727100002601738700002401764700002601788856012301814 2007 eng d a1566-736700aOxy-methane reforming over high temperature stable NiCoMgCeOx and NiCoMgOx supported on zirconia-haffnia catalysts: accelerated sulfur deactivation and regeneration0 aOxymethane reforming over high temperature stable NiCoMgCeOx and aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcMAR a561-5640 v83 a
NiCoMgOx and NiCoMgCeOx on commercial low surface area zirconia-haffnia catalysts have unusually high thermal stability (>= 2000 degrees 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 degrees C in 1:1 O-2 + N-2 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 H-2 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 NiCoMOx, and NiCoMgCeOx catalysts appear to be very promising candidates for the CPOM process. (c) 2006 Elsevier B.V. All rights reserved.
10aDeactivation10ahigh temperature stable10amethane10aPartial oxidation10aRegeneration10aSulfur1 aChoudhary, Vasant, R.1 aMondal, Kartick, C.1 aChoudhary, Tushar, V. uhttp://library.ncl.res.in/content/oxy-methane-reforming-over-high-temperature-stable-nicomgceox-and-nicomgox-supported