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《Chinese Journal of Catalysis》 2003-10
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Catalytic Performance of SAPO-11 Zeolite with Different Spacers for Isomerization of Octane

LIU Yueming 1,2* , ZHANG Fengmei 2, SHU Xingtian 2, HE Mingyuan 1,2 (1 Center for the Chemistry of Ionic Liquids, East China Normal University, Shanghai 200062, China; 2 Research Institute of Petroleum Processing, SINOPEC, Beijing 100083, China)  
SAPO 11 zeolite with special pore structure and tunable acidity shows its potential application in hydrocarbon isomerization. The spacer changes of SAPO 11 zeolite samples prepared by different methods before and after calcination were investigated. The effects of the spacer changes on the catalytic performance of SAPO 11 zeolite in hydrocarbon isomerization were studied. The XRD results showed that the unit cell symmetry of SAPO 11 zeolite changed after calcination. Some samples retained the spacer Icm2, and some samples changed from Icm2 to Pna2 1, and some samples had the mixture of Icm2 and Pna2 1. The spacer change from Icm2 to Pna2 1 led to the unit cell shrinkage of 7 00%. The Pd/SAPO 11 with different spacers was evaluated by n octane isomerization. The results showed that the isomerization of n octane is better over Pd/SAPO 11 with Icm2 than over that with Pna2 1. The shrinkage of unit cell showed that the compression of the framework took place along the elliptical channel ( c axis) and short axis of elliptical channel ( a axis), while the expansion occurred along the long axis of elliptical channels ( b axis). The larger the unit cell shrank, the more elliptical the elliptical channels. As a result, it was inconvenient for the product diffusion in the more elliptical channel, leading the product to be cracked deeply, thus the isomer selectivity decreased. Therefore, the SAPO 11 retaining Icm2 spacer after calcination had better catalytic performacne for hydrocarbon isomerization.
【CateGory Index】: O643.3
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