分子筛催化异丁烷与正丁烯烷基化反应性能

以Y、β、MCM-41和EU-1分子筛为活性组分制备异丁烷与正丁烯烷基化反应催化剂,并利用NH_3-TPD和N_2物理吸附-脱附对催化剂进行表征。结果表明,HY分子筛催化剂的总酸量最大,MCM-41分子筛催化剂的总酸量最小,Hβ和HEU-1分子筛催化剂总酸量适中,Hβ分子筛催化剂平均孔径最大,而大孔径有利于分子扩散。对分子筛催化异丁烷与正丁烯反应的催化性能进行研究,结果表明,Hβ分子筛催化剂的失活速率最低,正丁烯异构化率最低,生成的烷基化油辛烷值达85.2,对Hβ分子筛催化剂进行Pt元素改性后催化剂的失活速率降低。

Catalytic performance of molecular sieve catalysts for alkylation of isobutane and 1-butene

Alkylation catalysts were prepared by using Y,β,MCM-41 and EU-1 molecular sieves and were characterized by means of NH3-TPD and N2 physical adsorption-desorption.The results showed that the total acid amount of HY molecular sieve catalyst was maximum,the total acid amount of MCM-41 molecular sieve catalyst was minimum,and the total acid amounts of Hβ and HEU-1 molecular sieves were moderate.Hβ molecular sieve catalyst possessed maximum average aperture,which was conducive to molecular diffusion.The effects of molecular sieve catalyst for isobutane and 1-butene reaction were investigated.The results showed that Hβ molecular sieve catalyst possessed the lowest deactivation rate and the lowest isomerization rate of 1-butene,and the octane value of alkylated oil reached 85.2.The deactivation rate of Hβ molecular sieve catalyst after modification by Pt was reduced.