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《Chinese Journal of Catalysis》 2005-09
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Effect of Silanization on Catalytic Performance of Pt/SAPO-11 for Hydroisomerization of n-Dodecane

WANG Zheming1, TIAN Zhijian 1*, TENG Fei1, XU Yunpeng1, HU Sheng3, TAN Mingwei3, XU Zhusheng1, LIN Liwu 1,2 ( 1 Laboratory of Natural Gas Utilization and Applied Catalysis, Dalian Institute of Chemical Physics, The Chinese Academy ofSciences, Dalian 116023, Liaoning, China; 2 State Key Laboratory of Catalysis, Dalian Institute of Chemical Phys ics,The Chinese Academy of Sciences, Dalian 116023, Liaoning, China; 3 Researc h Institute of DaqingPetrochemical Company, Daqing 163714, Heilongjiang, China )  
The effect of silanization of SAPO-11 on the hydroisomerization of n-dodec ane over Pt/SAPO-11 catalysts was studied. The SAPO-11 support was silanized b y the chemical liquid deposition with tetraethoxysilane or tetrachlorosilicane. The Pt/SAPO-11 catalysts were characterized by X-ray diffraction, N2 adsorpt ion, NH3-temperature-programmed desorption(TPD) and hydrocracking of 2,2,4- trimethylpentane. N2 adsorption and NH3-TPD results show that the micropore volume and the acidity of the catalysts are reduced after silanization, and the reaction rates of 2,2,4-trimethylpetane hydrocracking over the catalysts are a lso reduced. This indicates that the acidic sites on the external surface of SAP O-11 are selectively deactivated by silanization. The selectivity for monobranc hed isomers over Pt/SAPO-11 is enhanced by silanization, which is ascribed to t he shrink of pore mouths of SAPO-11 after silanization. Moreover, the total hyd roisomerization selectivity decreases after silanization. Due to the shrink of p ore mouths of the silanized catalysts, diffusion limitation to branched products might increase, leading to severe hydrocracking reactions in micropores of the catalysts.
【Fund】: 中国科学院知识创新工程领域前沿项目资助(DICPK2003D4).
【CateGory Index】: O643.3
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