Steam carbon gasification of a nickel based oxygen carrier

被引:16
作者
Chiron, Francois-Xavier [1 ]
Patience, Gregory S. [1 ]
机构
[1] Ecole Polytech, Dept Chem Engn, Montreal, PQ H3C 3A7, Canada
关键词
Chemical Looping Combustion; Coking; Oxygen carrier; SCG; Micro-fluidized bed; CHEMICAL-LOOPING COMBUSTION; FLUIDIZED-BED; HYDROGEN-PRODUCTION; COKE FORMATION; KINETICS; CATALYSTS; GAS; GENERATION; DEPOSITION; METHANE;
D O I
10.1016/j.fuel.2011.02.029
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Ni-based oxygen carriers are promising candidates for Chemical Looping applications due to a combination of excellent methane conversion performance, mechanical stability, oxygen transfer capacity. However, experiments conducted on NiO/NiAl2O4 in a micro-fluidized bed reactor show that methane forms coke on active nickel sites. In subsequent tests, water vapour was fed to the coked Ni oxygen carrier producing a highly concentrated stream of CO/H-2 (1/1). In the absence of water vapour, production of hydrogen dropped with time while a methane/argon mixture was fed to the reactor. Co-feeding water together with methane improves stability - both H-2 production and carbon deposition were constant for over 1 h. Despite the tremendous lay down of carbon, catalytic activity remained stable at levels as low as 3 vol.% water vapour (and 10% methane). Water vapour is an effective oxidant for Ni(0) but is insufficient to entirely re-oxidize the oxygen carrier from Ni to NiO. (c) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码:2461 / 2466
页数:6
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