摘要
A co-precipitation method was employed to prepare Ni/Al_(2)O_(3)-ZrO_(2),Co/Al_(2)O_(3)-ZrO_(2)and Ni-Co/Al_(2)O_(3)-ZrO_(2)catalysts.Their properties were characterized by N_(2) adsorption(BET),thermogravimetric analysis(TGA),temperature-programmed reduction(TPR),temperature-programmed desorption(CO_(2)-TPD),and temperature-programmed surface reaction(CH_(4)-TPSR and CO_(2)-TPSR).Ni-Co/Al_(2)O_(3)-ZrO_(2)bimetallic catalyst has good performance in the reduction of active components Ni,Co and CO_(2)adsorption.Compared with mono-metallic catalyst,bimetallic catalyst could provide more active sites and CO_(2)adsorption sites(C+CO_(2)=2CO)for the methane-reforming reaction,and a more appropriate force formed between active components and composite support(SMSI)for the catalytic reaction.According to the CH_(4)-CO_(2)-TPSR,there were 80.9%and 81.5%higher CH_(4) and CO_(2)conversion over Ni-Co/Al_(2)O_(3)-ZrO_(2)catalyst,and its better resistance to carbon deposition,less than 0.5%of coke after 4 h reaction,was found by TGA.The high activity and excellent anti-coking of the Ni-Co/Al_(2)O_(3)-ZrO_(2)catalyst were closely related to the synergy between Ni and Co active metal,the strong metal-support interaction and the use of composite support.
基金
supported by the National Basic Research Program of China(2005CB221207)
the National Natural Science Foundation of China(Grants Nos.20846002,U0970134)
the Program for Changjiang Scholars and Innovative Research Team in University(No.IRT0517)
the Program for New Century Excellent Talents in University(No.NCET-05-0267)
the Ph.D.Programs Foundation for New Teacher(No.20091402120013)in Ministry of Education,China。
