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《Chinese Journal of Catalysis》 2006-08
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High Temperature Desorbed Hydrogen in Ni/La_2O_3/α-Al_2O_3 Improves the Initial Reaction Rate of CH_4/CO_2 Reforming

CUI Yuehua,XU Hengyong~*,GE Qingjie,BI Yadong,WANG Yuzhong,HOU Shoufu,LI Wenzhao(Dalian Institute of Chemical Physics,The Chinese Academy of Sciences,Dalian 116023,Liaoning,China)  
The hydrogen desorbed at high temperature(high-temperature hydrogen) over the hydrogen reduced catalyst Ni/La_2O_3/α-Al_2O_3 was observed by H_2 temperature-programmed desorption.Kinetic experiments show that the activity of the reforming reaction is initially increased with the amount of high-temperature hydrogen in Ni/La_2O_3/α-Al_2O_3 and finally reaches a constant value due to the in situ generation of the high-temperature hydrogen.Pulse results indicate that the high-temperature hydrogen in Ni/La_2O_3/α-Al_2O_3 is prone to form CH_x species with high x values,which has higher activity for the reaction of CH_x with CO_2.The Ni/La_2O_3/α-Al_2O_3 catalyst with plenty of high-temperature hydrogen can increase the x values of CH_x species and decrease the activation energy for the reaction between CH_x and CO_2,leading to a higher reaction rate.The addition of La_2O_3 on the Ni/α-Al_2O_3 catalyst promotes the reverse water-gas shift reaction and slightly improves the activation of CO_2.La_2O_3 also increases the amount of high-temperature hydrogen and its stability,resulting in higher x values of CH_x species and improving the reforming reaction rate.
【CateGory Index】: O643.32
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