Abstract
Si/Al ratio of ZSM-5 affecting Pt/ZSM-5 catalyst water-tolerance has been investigated for propane oxidation. Under wet condition (5 % H2O), it is found that Pt/ZSM-5 (18) catalyst contains both irreversible and reversible deactivation Pt active sites; Pt/ZSM-5 (130) and Pt/ZSM-5 (500) catalysts have only reversible deactivation Pt active sites; all the Pt active sites in the Pt/ZSM-5 (1200) catalyst are water tolerant. It is further found that the Si/Al ratio of ZSM-5 determines the geometrical and electronic states of Pt particles, and amount of surface acid sites on catalysts, thereby affecting the water tolerance of Pt/ZSM-5 catalyst. Low Si/Al ratio of ZSM-5 benefits to anchor the Pt species and form small Pt particles, but Pt particle with small size and more oxidized state Pt species (Ptδ+) on Pt/ZSM-5 (18) is easily poisoned by H2O. More Pt0 species generating on large Pt particle during propane oxidation reaction and low surface acid sites on Pt/ZSM-5 (1200) catalyst are responsible for its high water tolerance.
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