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Received March 12, 2002
Accepted August 29, 2002
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Investigation of Alumina-Supported Ni and Ni-Pd Catalysts by Partial Oxidation and Steam Reforming of n-Octane
The Key Laboratory of Science and Technology of Controllable Chemical Reactions, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China 1Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
Zhangjc@mail.buct.edu.cn
Korean Journal of Chemical Engineering, March 2003, 20(2), 288-292(5), 10.1007/BF02697243
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Abstract
A series of nickel and nickel-palladium supported upon alumina catalysts were prepared in order to obtain a suitable catalyst that could be used in the process of producing hydrogen by partial oxidation and steam reforming of n-octane. Hydrogen production by partial oxidation and steam reforming (POSR) of n-octane was investigated over alumina-supported Ni and Ni-Pd catalysts. The process occurred by a combination of exothermic partial oxidation and endothermic steam reforming of n-octane. It was found that Ni/Al2O3 catalyst activity was high at high temperatures_x000D_
and increased with the Ni loadings. Its activity, however, was not obviously increased when Ni loadings were over 5.0 wt%. Compared with nickel catalyst, the bimetallic catalyst of Ni-Pd/Al2O3 showed markedly increased activity and hydrogen selectivity at experimental conditions. The catalytic performance also became more stable when the palladium was added, which indicated that palladium plays an essential role in the catalytic action. The used catalysts of Ni-Pd/Al2O3 were regenerated three times by using air at space velocity of 2,000 h(-1) to obtain a long duration catalyst. Also, the typical catalyst was characterized by using SEM, BET, TG and ICP methods in detail.
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