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《Chemical Journal of Chinese Universities》 2006-05
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Conversion of n-Octane over Modified Nano-crystallite ZSM-5 Catalyst

ZHANG Pei-Qing~(1*),GUO Hong-Chen~(2),WANG Xiang-Sheng~(2),GUO Xin-Wen~(2)(1.Institute of Applied Catalysis,Yantai University,Yantai 264005,China;2.State Key Laboratory of Fine Chemicals;Institute of Industrial Catalysts,Dalian University of Technology,Dalian 116012,China)  
By combining alkaline medium hydrothermal treatment with loading mixed rare earth oxide,zinc oxide(or gallium oxide) on nanoscale ZSM-5(20—50 nm) as the active component,respectively,the modified nanoscale ZSM-5 catalysts were prepared,and characterized by TEM,XRF,IR,XRD and so on.The aromatization and isomerization of n-octane were used as the model reactions.The effects of the total acid amount,the acid strength distribution and the molar ratio of L to B acid sites on performance of aromatization and isomerization of the modified nanoscale HZSM-5 catalysts were investigated,and the relationship between acid strength and molar ratio of L to B acid sites and coking was also studied.The results indicate that the decrease of the total acid amount and the reduction of acid strength of the nanoscale HZSM-5 catalysts modified by combining alkaline medium hydrothermal treatment with loading mixed rare earth oxide resulted in wea-(kening) aromatization activity,strengthening isomerization activity and improving stability obviously.On the basis of the alkaline medium hydrothermal treatment and loading mixed rare earth oxide,the acid properties of the nanoscale HZSM-5 catalyst were regulated again after loading proper amount of zinc oxide(or gallium oxide),as a result,the total acid amount of catalysts increased,stronger acid sites of the catalysts decreased,the Brnsted acid sites of the catalyst decreased lightly,the Lewis acid sites of the catalyst increased obviously and the molar ratio of L to B acid sites of the catalyst increased.The proper molar ratio of L to B(1.4—1.7) and the synergistic action between Lewis acid sites and Brnsted acid sites made the catalysts have a stronger and more stable aromatization and isomerization activity,the rate of coking of the catalyst declined.The yields of aromatics and iso-paraffins in the products over the combining modification nano-scale HZSM-5 catalysts reached about 50% and 30%,respectively,the selectivity of the alkyl-aromatics(mainly C_(7)—C_(9)) and iso-paraffins(mainly C_(4)—C_(6)) with a high Octane Number attained 84% and 80%,respectively.
【Fund】: 山东省自然科学基金(批准号:Y2004B10)资助
【CateGory Index】: O643.32
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