Effect of secondary acid treatment on the structure of Ti-MWW zeolite and its catalytic performance

IF 4.8 3区材料科学 Q1 CHEMISTRY, APPLIED

Microporous and Mesoporous Materials Pub Date : 2025-03-01 DOI:10.1016/j.micromeso.2025.113572

Shaoqing Jin, Qiangqiang Luo, Xueyan Fan, Hongmin Sun, Weimin Yang

{"title":"Effect of secondary acid treatment on the structure of Ti-MWW zeolite and its catalytic performance","authors":"Shaoqing Jin, Qiangqiang Luo, Xueyan Fan, Hongmin Sun, Weimin Yang","doi":"10.1016/j.micromeso.2025.113572","DOIUrl":null,"url":null,"abstract":"<div><div>Although Ti-MWW zeolite has received lots of attention due to its superior catalytic oxidation performance, it's still challenging to obtain boron-free Ti-MWW zeolite with few defects and high catalytic performance by a simple way. Herein, secondary acid treatment was utilized to modify the structure of Ti-MWW zeolite and its catalytic behavior. It was found that almost all the framework boron atoms could be removed by secondary acid treatment under different conditions. However, different from secondary acid treatment under low-temperature & high-acid concentration (LTHC) condition, that under high-temperature & low-acid concentration (HTLC) condition can heal the silanol nests originally existing and formed during boron removal through silicon migration, remarkably improving the hydrophobicity, the micro-environment of framework TiO<sub>4</sub> species (Fw-TiO<sub>4</sub>) and thus the catalytic activity in 1-hexene epoxidation in spite of a certain amount of inactive anatase TiO<sub>2</sub> species formed. This study would be helpful for the post modification and understanding of Ti-MWW zeolite.</div></div>","PeriodicalId":392,"journal":{"name":"Microporous and Mesoporous Materials","volume":"389 ","pages":"Article 113572"},"PeriodicalIF":4.8000,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Microporous and Mesoporous Materials","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1387181125000861","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, APPLIED","Score":null,"Total":0}

引用次数: 0

Abstract

Although Ti-MWW zeolite has received lots of attention due to its superior catalytic oxidation performance, it's still challenging to obtain boron-free Ti-MWW zeolite with few defects and high catalytic performance by a simple way. Herein, secondary acid treatment was utilized to modify the structure of Ti-MWW zeolite and its catalytic behavior. It was found that almost all the framework boron atoms could be removed by secondary acid treatment under different conditions. However, different from secondary acid treatment under low-temperature & high-acid concentration (LTHC) condition, that under high-temperature & low-acid concentration (HTLC) condition can heal the silanol nests originally existing and formed during boron removal through silicon migration, remarkably improving the hydrophobicity, the micro-environment of framework TiO₄ species (Fw-TiO₄) and thus the catalytic activity in 1-hexene epoxidation in spite of a certain amount of inactive anatase TiO₂ species formed. This study would be helpful for the post modification and understanding of Ti-MWW zeolite.

Abstract Image

查看原文本刊更多论文

二次酸处理对Ti-MWW分子筛结构及催化性能的影响

尽管Ti-MWW沸石因其优异的催化氧化性能而受到广泛关注，但通过简单的方法获得缺陷少、催化性能高的无硼Ti-MWW沸石仍是一项挑战。本文采用二次酸处理对Ti-MWW分子筛的结构和催化性能进行了改性。研究发现，在不同条件下，二次酸处理几乎可以去除所有的骨架硼原子。但与低温下的二次酸处理不同；高酸浓度（LTHC）条件，高温条件下；低酸浓度（HTLC）条件可以通过硅迁移修复脱硼过程中原有形成的硅醇巢，显著改善骨架型TiO2 （f -TiO4）的疏水性和微环境，从而在形成一定活性锐钛矿型TiO2的情况下提高1-己烯环氧化的催化活性。本研究将有助于对Ti-MWW分子筛的改性和理解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Microporous and Mesoporous Materials 化学-材料科学：综合

CiteScore

10.70

自引率

5.80%

发文量

649

审稿时长

26 days

期刊介绍： Microporous and Mesoporous Materials covers novel and significant aspects of porous solids classified as either microporous (pore size up to 2 nm) or mesoporous (pore size 2 to 50 nm). The porosity should have a specific impact on the material properties or application. Typical examples are zeolites and zeolite-like materials, pillared materials, clathrasils and clathrates, carbon molecular sieves, ordered mesoporous materials, organic/inorganic porous hybrid materials, or porous metal oxides. Both natural and synthetic porous materials are within the scope of the journal. Topics which are particularly of interest include: All aspects of natural microporous and mesoporous solids The synthesis of crystalline or amorphous porous materials The physico-chemical characterization of microporous and mesoporous solids, especially spectroscopic and microscopic The modification of microporous and mesoporous solids, for example by ion exchange or solid-state reactions All topics related to diffusion of mobile species in the pores of microporous and mesoporous materials Adsorption (and other separation techniques) using microporous or mesoporous adsorbents Catalysis by microporous and mesoporous materials Host/guest interactions Theoretical chemistry and modelling of host/guest interactions All topics related to the application of microporous and mesoporous materials in industrial catalysis, separation technology, environmental protection, electrochemistry, membranes, sensors, optical devices, etc.