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《Chinese Journal of Catalysis》 2003-09
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Hydroisomerization of n-Hexadecane on Zeolite Catalysts

HUANG Weiguo 1* , LI Dadong 1, SHI Yahua 1, KANG Xiaohong 1, MENG Xianbo 1, WANG Kui 1, DONG Weizheng 1, NIE Hong 1, LI Can 2(1 Research Institute of Petroleum Processing, SINOPEC, Beijing 100083, China; 2 State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, The Chinese Academy of Sciences, Dalian 116023, Liaoning, China)  
Hydroisomerization of n hexadecane on zeolite catalysts was studied and the reaction mechanism was discussed, which may provide new clues to developing hydroisomerization catalysts with high selectivity. The catalysts were prepared as follows: zeolite and alumina were mixed and then extruded to make a support, after drying and calcination, platinum was loaded on by wet impregnation with Pt(NH 3) 4Cl 2 solution. The hydroisomerization of n hexadecane was carried out in a continuous fixed bed reactor with down flow. The catalysts were loaded in the reactor and reduced for 4 h. Then n hexadecane was pumped into the reactor at different temperatures. The reaction results indicated that Pt/MCM 22 and Pt/ZSM 5 catalysts show higher activity but lower selectivity than Pt/Hβ and Pt/SAPO 11 catalysts. The selectivity of Pt/SAPO 11 is the highest, more than 90% at the conversion of 80%. From the cracked product distribution, it could be seen that, for Pt/ZSM 5 and Pt/Hβ, the fractions of small molecule products, such as C 3, C 4 and C 5, are more than those of long chain products, but for Pt/SAPO 11, the cracked product distribution is nearly symmetrical, which means that there is secondary cracking occurred for Pt/ZSM 5 and Pt/Hβ but no for Pt/SAPO 11. The symmetrical distribution of cracked products is the characteristics of large pore zeolites or amorphous catalysts, so it can be concluded that the hydroisomerization takes place on the external surface or at the pore mouth of SAPO 11, but not in the pore channel. The different zeolites showed different behavior for the isomerization, which can be attributed to their different acidity. The strong acidity of MCM 22 and ZSM 5 leads to poor isomerization selectivity. SAPO 11 has high selectivity, indicating that the weak and mild acids are favorable to the isomerization.
【CateGory Index】: O643.3
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