Effect of post treatment on the local structure of hierarchical Beta prepared by desilication and the catalytic performance in Friedel-Crafts alkylation
| HERO ID | 2905380 |
|---|---|
| In Press | No |
| Year | 2015 |
| Title | Effect of post treatment on the local structure of hierarchical Beta prepared by desilication and the catalytic performance in Friedel-Crafts alkylation |
| Authoring Organization | State University of New York |
| Journal | Microporous and Mesoporous Materials |
| Volume | 206 |
| Issue | C |
| Page Numbers | 42-51 |
| Abstract | Desilication method has been developed to prepare hierarchical zeolites. However, the hierarchical Beta prepared by desilication generally exhibited much poorer catalytic activity than parent one in some acidcatalyzed reactions mainly due to the great loss of acidity. Here, we report that subsequent acid treatment after desilication can greatly recover the acidity of zeolite Beta. As a result, the hierarchical Beta with acid treatment exhibited enhanced catalytic performance in the benzylation of benzene or mesitylene with relatively large molecular size. Additionally, the local structural change in zeolite Beta before and after post treatment was deeply studied by the NMR technique. The results indicated that during the desilication partial tetrahedral coordination Al was transformed into the distorted tetrahedral and pentahedral coordination Al and subsequent acid treatment led to the increase of the proportion of tetrahedral coordination Al. Thus, the number of total Bronsted acid sites in zeolite Beta was decreased after the desilication and subsequent acid treatment may increase the number of total and accessible Bronsted acid sites. These results suggested that acid treatment is helpful for improving the catalytic performance of the desilicated Beta in some acid-catalytic reactions, especially toward large molecules. (C) 2014 Elsevier Inc. All rights reserved. |
| Doi | 10.1016/j.micromeso.2014.12.017 |
| Wosid | WOS:000350191200006 |
| Is Certified Translation | No |
| Dupe Override | No |
| Comments | Scopus URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84926222173&doi=10.1016%2fj.micromeso.2014.12.017&partnerID=40&md5=f36df7cd9f1ce94cb6f3f563379f63ad |
| Is Public | Yes |
| Language Text | English |
| Keyword | Hierarchical Beta; Benzyl alcohol; Benzylation; Mesitylene; Post treatment |