Impact of a polymer modifier on directing the non-classical crystallization pathway of TS-1 zeolite: accelerating nucleation and enriching active sites

被引：22

作者：

Zhang, Jiani ^{[1
]}

Bai, Risheng ^{[1
]}

Zhou, Yida ^{[1
]}

Chen, Ziyi ^{[2
]}

Zhang, Peng ^{[2
]}

Li, Jiyang ^{[1
]}

Yu, Jihong ^{[1
]}

机构：

[1] Jilin Univ, Coll Chem, State Key Lab Inorgan Synth & Preparat Chem, Changchun 130012, Peoples R China

[2] Dalhousie Univ, Dept Chem, Halifax, NS B4H 4R2, Canada

来源：

CHEMICAL SCIENCE | 2022年 / 13卷 / 44期

基金：

中国国家自然科学基金;

关键词：

SURFACE GROWTH REVEALS; MFI ZEOLITE; CATALYTIC PERFORMANCE; TI; TITANOSILICATE; ACID; NMR; CONSTRUCTION; PRECURSORS; ATTACHMENT;

D O I：

10.1039/d2sc04544c

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The crystallization process directly affects the physicochemical properties and active centers of zeolites; however, controllable tuning of the zeolite crystallization process remains a challenge. Herein, we utilized a polymer (polyacrylamide, PAM) to control the precursor structure evolution of TS-1 zeolite through a two-step crystallization process, so that the crystallization path was switched from a classical to a non-classical mechanism, which greatly accelerated nucleation and enriched active Ti sites. The TS-1 crystallization process was investigated by means of various advanced characterization techniques. It was found that specific interactions between PAM and Si/Ti species promoted the assembly of colloidal precursors containing ordered structural fragments and stabilized Ti species in the precursors, leading to a 1.5-fold shortened crystallization time and enriched Ti content in TS-1 (Si/Ti = 29). The PAM-regulated TS-1 zeolite exhibited enhanced catalytic performance in oxidative reactions compared to conventional samples.

引用

页码：13006 / 13014

页数：9