Abstract: The Pt dispersed on acidic HLzeolite exhibited "electronic deficiency" and did not show an obvious dehydrogenation activity in isopropanol decomposition, but enhanced the conversion of isopropanol to form H₂O and propene through the protection of the acid sites on zeolite against deactivation by carbonaceous overlayers. Pt on KLbasic zeolite, however, exhibited some electron rich and high dehydrogenation activity in isopropanol decomposition.Besides, Pt/ KLwas 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 KLto HL, resulting in that the catalytic properties of the mixture are similar as that of Pt/HLin decomposition of isopropanol. It was proved that there was an obvious interaction between Pt and Lzeolites. 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.

Key words: Pt/L Zeolite, Zeolite catalysts, Decomposition of isopropanol, Interaction of Pt-L zeolites.