Bulky macroporous titanium silicalite-1 free of extraframework titanium for phenol hydroxylation

Yi Zuo, Yu Chen, Tonghui Li, Jiaojiao Yu, Hong Yang, Min Liu, Xinwen Guo

Research output: Contribution to journalArticlepeer-review

Abstract

A bulky composite material, CaCO3@TS-1, was synthesized in a tetrapropylammonium bromide hydrothermal system by adding nanosized CaCO3 particles of 60–80 nm to a titanium silicalite-1 (TS-1) synthesis gel. The macroporous TS-1 free of extraframework Ti was then obtained by the posttreatment of the CaCO3@TS-1 in HCl solution to remove CaCO3 and extraframework Ti simultaneously. This study demonstrates that this new synthesis route, the acidity posttreatment, can produce a bulky TS-1 with volume-controllable intracrystal macropores. The crystallization mechanism of the macroporous TS-1 was studied systematically. The addition of CaCO3 accelerates the crystallization of silicon source, and leads to the similar crystallization rates of silicon and titanium sources. Therefore, the formation of extraframework Ti was inhibited, and more Ti ions were inserted into the TS-1 framework. The catalytic performance of macroporous TS-1 was evaluated in the hydroxylation of phenol. An outstanding catalytic activity was obtained due to their enhanced diffusion property and reduced extraframework Ti.

Original languageEnglish
Article number111884
JournalMicroporous and Mesoporous Materials
Volume336
DOIs
Publication statusPublished - May 2022

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