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制备了不同负载量的负载型PW/MCM-41催化剂。通过XRD、NH3-TPD、N2吸附和苯与1-十二烯烷基化反应考察了PW/MCM-41催化剂的组成、酸性及孔结构对其催化性能的影响,并与HY分子筛进行比较。结果表明,在磷钨杂多酸负载量不高于50%时,系列负载型PW/MCM-41催化剂兼备较强的酸性和单一的中孔结构特性,MCM-41载体的骨架结构保持较完整,杂多酸分散程度较高;通过改变预处理温度和杂多酸的负载量,可有效地调整PW/MCM-41的催化性能;与HY分子筛相比,PW(50)/MCM-41催化剂对苯与1-十二烯烷基化反应显示出较高的催化活性、稳定性和线性烷基苯选择性,而且线性烷基苯异构体分布更合理。
Different loadings of supported PW / MCM-41 catalysts were prepared. The effects of the composition, acidity and pore structure of PW / MCM-41 catalyst on the catalytic performance of PW / MCM-41 catalyst were investigated by XRD, NH3-TPD, N2 adsorption and benzene and 1- dodecene alkylation. The results show that the series of supported PW / MCM-41 catalysts possess both strong acidity and single mesoporous structure when the loading of phosphotungstic heteropolyacids is no more than 50%, and the framework structure of MCM-41 carrier remains relatively intact , The degree of dispersion of heteropolyacids is higher; the catalytic performance of PW / MCM-41 can be effectively adjusted by changing the pretreatment temperature and the loading of heteropolyacid. Compared with HY molecular sieve, PW (50) / MCM-41 catalyst Alkylation of benzene with 1-dodecene showed high catalytic activity, stability and linear alkylbenzene selectivity, and linear alkylbenzene isomer distribution was more reasonable.