探针反应和FTIR法研究Pt与L型沸石的相互作用

Investigation on Interaction of Pt and L Zeolite Using Probe Reaction and in situ FTIR

探针反应和ＦＴＩＲ法研究Ｐｔ与Ｌ型沸石的相互作用董家禄，朱建华，须沁华，张婕，刘大壮（南京大学化学系，南京，２１０００８）（郑州工学院化工系，郑州，４５０００２）关键词Ｐｔ／Ｌ沸石，沸石催化剂，异丙醇分解反应，Ｐｔ－载体相互作用Ｐｔ的分散度和电子状态...

The Pt dispersed on acidic HL zeolite exhibited 'electronic deficiency' and did not show an obvious dehydrogenation activity in isopropanol decomposition, but enhanced the conversion of isopropanol to form H_2O and propene through the protection of the acid sites on zeolite against deactivation by carbonaceous overlayers. Pt on KL basic zeolite, however,exhibited some electron rich and high dehydrogenation activity in isopropanol decomposition.Besides, Pt/ KL was very sensitive to thiophene poison in the reactions. During the process of pretreatment and reaction, the Pt in the mixture of (Pt/KL+HL) migrated from KL to HL, resulting in that the catalytic properties of the mixture are similar as that of Pt/HL in decomposition of isopropanol. It was proved that there was an obvious interaction between Pt and L zeolites. The Pt supported was easier to become ' electronic deficiency' than to be 'electronic rich', which meant that the interaction of Pt with acidic sites was stronger than that of Pt with basic sites because of the metallicity of Pt which can be electronic donor easily but to be the electronic accepter difficultly.