Abstract
Abstract The Lewis acid sites (LA) in catalyst plays an important role in the propylene oxide rearrangement reaction. In order to introduce more LA in Beta, Zn-Beta was prepared by two-step postsynthesis method. The results of PyIR showed that the acidity of the sample changed greatly, the Bronsted acid sites (BA) disappeared, and new LA was created with the introduction of Zn. The location of the acid sites of Zn-Beta was determined by trimethylpyridine adsorbed IR, the results showed that the new LA was distributed on the inner surface of the pore. The mechanism of propylene oxide rearrangement with Zn-Beta as catalyst was studied by in-situ DRIFTS. It was proved that the epoxy bond of propylene oxide interacted with new LA to form a transition state between the bond of C O and C O, and then converts to carbonyl of propionaldehyde. The catalytic performance of Zn-Beta was better than Beta.
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