VMoNb/CeO2 as an efficient catalyst for the gas-phase selective oxidation of toluene to benzaldehyde

IF 3.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Molecular Catalysis Pub Date : 2024-09-24 DOI:10.1016/j.mcat.2024.114570

Jiaqi Zhou , Qingrong Wang , Hong Liu , Ming Bao , Jiasheng Wang

引用次数: 0

Abstract

Gas-phase selective oxidation of toluene with air is a promising method for producing high-purity benzaldehyde, but the yields of existing catalysts are limited, so the development of more efficient catalysts is of great importance to the chemical industry. Herein VMoNb/CeO₂ was prepared and characterized by SEM, XRD, Raman, XPS, H₂-TPR, and NH₃-TPD. The introduction of Mo generated V–O–Mo “asymmetric lattice oxygen” and thus brought high activity. Nb moderated the acidity and oxygen vacancy so as to improve the selectivity. The VMoNb/CeO₂ catalyst showed very high catalytic activity at 500 °C, with 35% toluene conversion and 82% benzaldehyde selectivity at an air flow rate of 30 mL/min for V:Mo:Nb =2:5:0.8. This work could serve as a reference for designing mixed metal oxide catalysts for selective oxidation of aromatic hydrocarbons.

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VMoNb/CeO2 作为气相选择性氧化甲苯生成苯甲醛的高效催化剂

用空气对甲苯进行气相选择性氧化是一种生产高纯度苯甲醛的有效方法，但现有催化剂的产率有限，因此开发更高效的催化剂对化学工业具有重要意义。本文制备了 VMoNb/CeO2，并通过 SEM、XRD、拉曼、XPS、H2-TPR 和 NH3-TPD 对其进行了表征。Mo 的引入产生了 V-O-Mo "不对称晶格氧"，从而带来了高活性。铌缓和了酸性和氧空位，从而提高了选择性。VMoNb/CeO2 催化剂在 500 ℃ 下表现出极高的催化活性，在 V:Mo:Nb =2:5:0.8 的条件下，空气流量为 30 mL/min 时，甲苯转化率为 35%，苯甲醛选择性为 82%。这项工作可为设计用于芳香烃选择性氧化的混合金属氧化物催化剂提供参考。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Molecular Catalysis Chemical Engineering-Process Chemistry and Technology

CiteScore

6.90

自引率

10.90%

发文量

700

审稿时长

40 days

期刊介绍： Molecular Catalysis publishes full papers that are original, rigorous, and scholarly contributions examining the molecular and atomic aspects of catalytic activation and reaction mechanisms. The fields covered are: Heterogeneous catalysis including immobilized molecular catalysts Homogeneous catalysis including organocatalysis, organometallic catalysis and biocatalysis Photo- and electrochemistry Theoretical aspects of catalysis analyzed by computational methods