SAPO-34分子筛催化丁烯转化制丙烯的研究

通过水热法合成SAPO-34分子筛,将其制成催化剂用于催化丁烯转化制取丙烯,考察了反应温度、空速和铝磷比等对催化性能的影响;还比较了SAPO-34分子筛与ZSM-5分子筛催化该反应的差异.结果表明,在实验范围内,反应温度升高会使得丁烯的转化率明显增高,且丙烯选择性提高;而空速增加,则丁烯的转化率和丙烯选择性降低;铝磷比越大,对丙烯的选择性越差.在有效的反应时间内,SAPO-34分子筛催化效果好于ZSM-5分子筛,但单程寿命较ZSM-5分子筛短.

Study on Conversion of Butylenes to Propylene over SAPO-34 Molecular Sieve

SAPO-34 molecular sieve was synthesized through hydro-thermal crystallization and used as catalyst for preparation of propylene from butylenes.The catalytic performances under different temperature,gas hourly space velocity(GHSV) and Al/P ratios were investigated.The difference between SAPO-34 molecular sieve and ZSM-5 zeolite as the catalysts for the conversion of butylenes to propylene was compared in detail.The results showed that increasing the reaction temperature may improve the conversion of butylenes and the formation of propylene.The conversion of butylenes and the selectivity to propylene were suppressed with the increase of GHSV and Al/P ratio.The initial catalytic activity of SAPO-34 molecular sieves was better than that of ZSM-5 zeolite.The single process lifetime of SAPO-34 was shorter than that of ZSM-5.