Catalytic activities and coking resistance of Ni/perovskites in steam reforming of methane
Catalytic activities and coking resistance of Ni/perovskites in steam reforming of methane
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DOI：
10.1016/j.apcata.2005.02.020
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发表时间：
2005-05
影响因子：
5.5
通讯作者：
Kohei Urasaki;Yasushi Sekine;Shouji Kawabe;E. Kikuchi;M. Matsukata
中科院分区：
文献类型：
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作者：
Kohei Urasaki;Yasushi Sekine;Shouji Kawabe;E. Kikuchi;M. Matsukata
采用LaAlO 3、LaFeO 3、SrTiO 3、BaTiO 3、La0.4Ba0.6Co0.2Fe0.8O3−δ等钙钛矿负载镍催化剂进行甲烷水蒸气重整制氢反应，并与传统Ni/α-Al 2 O3催化剂进行比较。Ni/LaAlO 3和Ni/SrTiO 3在Ni/钙钛矿催化剂中表现出较高的催化活性和较长时间的稳定性。程序升温氧化实验表明，Ni/LaAlO 3催化剂上未形成活性碳物种。程序升温还原实验结果表明，钙钛矿中晶格氧在反应过程中发生了消耗和恢复，钙钛矿的还原对水蒸气重整活性有很大的影响。钙钛矿中的晶格氧被认为在促进吸附在金属镍上的CHx碎片的氧化中起重要作用。
Steam reforming of methane for the purpose of hydrogen production was performed using nickel catalysts supported on a variety of perovskites, including LaAlO3, LaFeO3, SrTiO3, BaTiO3, La0.4Ba0.6Co0.2Fe0.8O3−δ, to compare the catalytic activity and resistance to coking of these catalysts to those of the conventional Ni/α-Al2O3catalyst. Ni/LaAlO3and Ni/SrTiO3showed high catalytic activities among the Ni/perovskites and longer-term stabilities than the conventional catalyst. Temperature programmed oxidation of carbon deposited on used catalysts revealed that inactive carbon species detected on Ni/α-Al2O3were not formed in the case of Ni/LaAlO3. The results of temperature programmed reduction confirmed that consumption and recovery of the lattice oxygen in perovskites occurred during the reaction, and that the reducibility of perovskites had a great impact on the steam reforming activity. The lattice oxygen in perovskites is considered to play important roles in promoting the oxidation of CHxfragments adsorbed on metallic nickel.