Hydrothermal Modification of TS-1 Zeolites with Organic Amines and Salts to Construct Highly Selective Catalysts for Cyclopentene Epoxidation

Developing efficient heterogeneous catalysts for cyclic olefins epoxidation is highly attractive for meeting the growing need for various cyclic epoxides. Herein, hierarchical TS-1 zeolite with relatively abundant mesopores and less amount of surface hydroxyl groups was obtained by hydrothermal modi...

Full description

Saved in:
Bibliographic Details
Published inCatalysts Vol. 12; no. 10; p. 1241
Main Authors Chang, Xin-Yu, Sun, Yu-Ting, Song, Xiao-Jing, Yang, Xiao-Tong, Wu, Yu-Qing, Jia, Ming-Jun
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.10.2022
Subjects
Alkenes
Amines
Ammonia
Catalysts
Catalytic activity
Catalytic converters
Catalytic oxidation
Chemical reactions
Crystals
Cyclopentene
Epoxidation
Etching
Hydrogen peroxide
Hydrothermal treatment
Hydroxyl groups
Mass transport
Morphology
Olefins
Saline solutions
Selectivity
Zeolites
China
Online AccessGet full text

Cover

More Information
Summary:Developing efficient heterogeneous catalysts for cyclic olefins epoxidation is highly attractive for meeting the growing need for various cyclic epoxides. Herein, hierarchical TS-1 zeolite with relatively abundant mesopores and less amount of surface hydroxyl groups was obtained by hydrothermal modification of an as-synthesized TS-1 zeolite with a mixed solution of ammonia, tetrapropylammonium bromide (TPABr) and KCl. The post-modified TS-1 zeolite exhibited much higher catalytic activity (52% conversion) and epoxide selectivity (98%) for the epoxidation of cyclopentene than the conventional TS-1 zeolites. The excellent catalytic activity of the hierarchical TS-1 could be mainly assigned to the enhancement of the mass transport ability and the accessibility of the active Ti species, while the improvement of epoxidation selectivity may be mainly related to the introduction of a certain amount of K+ that can effectively modulate the coordination environment of Ti species as well as the polarity of the zeolite. This work demonstrated that a highly active and selective catalyst for the H2O2-mediated cyclopentene epoxidation could be obtained by concurrently generating mesopore and extinguishing the unfavorable defective hydroxyl groups through the simple hydrothermal treatment of the conventional TS-1 zeolite with a mixed base/salt solution.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 14
ISSN:2073-4344
2073-4344
DOI:10.3390/catal12101241