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《Journal of Beijing University of Chemical Technology(Natural Science Edition)》 2013-01
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Preparation of silicon aluminium phosphate SAPO-34/cordierite monolithic catalysts and their performance for methanol to olefin conversion

LU DanDan TIAN ShuXun JI ShengFu(State Key Laboratory of Chemical Resource Engineering,College of Chemical Engineering, Beijing University of Chemical Technology,Beijing 100029,China)  
Three series of silicon aluminium phosphate SAPO-34/cordierite monolithic catalysts have been prepared on a pretreated cordierite support by vapor transfer,in situ synthesis and direct coating methods.The samples were characterized by XRD and N2 adsorption-desorption measurements.The catalytic performance of the SAPO-34/cordierite monolithic catalysts for methanol to olefin conversion was evaluated in a fixed-bed micro-reactor.The results showed that the structure of the SAPO-34 molecular sieve was retained in all of the SAPO-34/cordierite monolithic catalysts.The BET surface area of the SAPO-34/cordierite monolithic catalysts prepared by the vapor transfer method were higher than those of materials prepared by the other methods.The pore diameter of the SAPO-34/cordierite monolithic catalysts prepared by the situ synthesis method were larger than those of the other materials.For catalysts with similar SAPO-34 contents,the catalytic activities of SAPO-34/cordierite monolithic catalysts prepared by the vapor transfer method were the best.The optimum conditions for production of olefins involved temperatures in the range 380-420 ℃ and feed space velocities in the range 520-810 mL/(g·h).A 19.7%SAPO-34/cordierite monolithic catalyst prepared by the vapor transfer method had the best catalytic activity for methanol to olefin conversion.The selectivities to ethene and propylene of this catalyst were 40.9% and 32.8%,respectively,and the total selectivity of the olefins reached 73.7% at a temperature of 400 ℃ and space feed velocity of 670 mL/(g·h).
【Fund】: 国家自然科学基金(20473009)
【CateGory Index】: TQ203.2
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