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RISS 인기검색어
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- 저자 : Diyong (검색결과 2 건)
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Zhang, Jinchang,Wang, Yanhui,Ma, Runyu,Wu, Diyong 한국화학공학회 2003 Korean Journal of Chemical Engineering Vol.20 No.2
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/AI_2O_3 catalyst activity was high at high temperatures 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/AI_2O_3 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/AI_2O_3 were regenerated three times by using air at space velocity of 2.000h^-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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NOx Storage-Reduction over Pt/Mg-Al-O Catalysts with Different Mg/Al Atomic Ratios
Guangwen Chen,Hao Cheng,Shudong Wang,Diyong Wu,Yin Zhang,Henqiang Li 한국화학공학회 2004 Korean Journal of Chemical Engineering Vol.21 No.3
A series of Pt/Mg-Al-O catalysts with different Mg/Al atomic ratios were prepared. The NOx storagecapacities of these catalysts were measured by isothermal storage at 350oC. It was found that the NOx storage capacityincreased with increasing Mg/Al atomic ratios. The catalytic behaviors of Pt/Mg-Al-O and Pt/MgO were studied withstorage-reduction cycles at 400oC. Under oxidizing conditions, NOx concentration in the outlet gas gradually increasedwith time, which indicated the catalysts could store NOx effectively. After a switch from oxidizing conditions toreducing conditions, NOx desorption peak emerged immediately due to the incomplete reduction of stored NOx, whichlowered the total NOx conversion. With increasing Mg/Al atomic ratio in the catalysts, NOx conversion increases. Pt/MgO has the highest NOx conversion because of its best activity in the reduction of NOx by C3H6. It seems that withan increasing amount of MgO in the catalysts, the self-poisoning of Pt-sites by adsorbed species during the reactionof NOx with C3H6 may be inhibited effectively.
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