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早期的研究表明沸石催化剂能有效地促进烷基化反应,自中孔ZSM-5沸石分子筛问世以来,不少文献报导了用改性的ZSM-5分子筛做健化剂可使反应产物中对二甲苯选择性大大提高。而未改性的HZSM-5催化剂则一般不具有对位选择性。 SAPO-11分子筛是联合碳化物公司于1984年推出的一种新型的磷酸铝分子筛,它的催化性能和物化性质引起人们的普遍关注。
Earlier studies have shown that zeolite catalysts can effectively promote the alkylation reaction. Since the advent of mesoporous ZSM-5 zeolites, many reports reported that the use of modified ZSM-5 zeolite as a thickener can make the reaction product of bis Toluene selectivity greatly increased. The unmodified HZSM-5 catalyst generally does not have para-selectivity. SAPO-11 molecular sieve is a new type of aluminum phosphate molecular sieve that Union Carbide introduced in 1984, and its catalytic performance and physico-chemical properties have attracted people’s attention.