铝柱联合成皂石上三甲苯转化的研究

以１，３，５－ＴＭＢ和１，２，４－ＴＭＢ转化为模型反应，探讨了铝柱联合成皂石（简称Ａｌ－ＰＳＳ）上表面酸性质的特点。结合不同脱附温度下吡啶吸附量及ＮＨ＿３－ＴＰＤ研究，实验证明，Ａｌ－ＰＳＳ表面具有数目较多，强度较大的酸性中心　和较弱的碱性中心　，与铝柱联天然膨润土（简称Ａｌ－ＣＬＢ）比较，有较高的脱烷基选择性。两种三甲苯在Ａｌ－ＰＳＳ上的转化，不论是单一反应物还是二者混合反应物，其产物分布基本相同，四甲苯在其异构体中含量均高达８０％，说明在本研究反应条件下，两种探针分子以Ａｌ－ＰＳＳ为催化剂进行转化，其产物结构由催化剂结构和性质决定。

Conversion of Trimethylbenzene on Alumina-Pillared Synthetic Saponite

The conversion of trimethylbenzene was used as the model reaction for characterizing aluminapillared synthetic saponite(Al-PSS). The densities and strength of the acid sites were determined by the adsorbed amount of pyridine after desorption at various temperatures and NH_3-TPD. It was shown that Al-PSS possesses more and stronger acid sites and weaker base sites compared with alumina-cross linked bentonite(Al-CLB), Al-PSS showed a higher selectivity for dealkylation (S_(de)) in the reaction of TMB. The product distributions are almost the same although the reactants are different. The fraction of 1, 2, 4, 5-TeMB isomers remained to be 80%. The experimental results showed that the products of conversion of 1, 3, 5-TMB and 1, 2, 4-TMB were determined by the structure and properties of the catalyst.