铂锡催化剂对甲基环戊烷脱氢异构反应的催化性能研究

STUDY ON CATALYTIC ACTIVITY OF PLATINUM-TIN CATALYST FOR THE DEHYDROISOMERIZATION OF METHYLCYCLOPENTANE

以甲基环戊烷脱氢异构反应为探针反应,结合程序升温还原、氢氧滴定等催化剂物化表征手段,研究了金属Pt、助剂Sn及载体等对Pt-Sn/Al2O3催化剂催化甲基环戊烷脱氢异构反应性能的影响。结果表明:催化剂中添加助剂Sn后,甲基环戊烷转化率下降,目标产物苯选择性提高;催化剂的酸量略有增加,Pt的两种活性中心发生了变化,Pt与Sn之间发生了一定的相互作用,改变了催化剂的催化性能。

To know more about the reactions of methylcyclopentane in the catalytic reforming process, the dehydroisomerization process to benzene was studied over Pt Sn/A12Oa catalysts using methylcyclopentane as a probe. Different kinds of Pt-Sn/A1203 and Pt/AI2O3 catalysts were prepared, and the influence of content of Pt,C1 and Sn on the methylcyclopentane conversion and benzene selectivi- ty was investigated. The results show that the methylcyclopentane conversion increases firstly and then decrease with Pt content increasing. The introduction of tin reduces the methylcyclopentane conversion, while benzene selectivity presents a similar variation trend to the conversion as Pt content changes. It is suggested that the addition of Sn generates two kinds of active centers and that tin apparently changes the catalytic activities of Pt/Al2O3catalysts because of interaction between Pt and Sn.