教师科研快讯

杨鹏老师在《Chemical Engineering Journal》杂志发表学术成果

日期： 2019-10-9     供稿：材料化学与工程系

2019年10月9日，我院教师杨鹏博士在化学工程领域重要期刊《Chemical Engineering Journal》（2018年影响因子IF为8.355）在线发表题为“Synthesis of W-Nb-O solid acid for catalytic combustion of low-concentration monochlorobenzene”的学术成果（文章链接https://doi.org/10.1016/j.cej.2019.123045）。这是近期在该杂志上发表的又一新成果。前期成果题目为Adsorption/catalytic combustion of toxic 1,2-dichloroethane on multifunctional Nb₂O₅-TiO₂ composite metal oxides，文章链接https://doi.org/10.1016/j.cej.2018.10.071。

Catalytic combustion of MCB onWO₃-Nb₂O₅(2W1Nb) and WO₃-V₂O₅(2W1V).

该论文的通讯作者为杨鹏博士，我校为第一完成单位和通讯单位。本研究工作引入了新的表征方法，发现WO₃-Nb₂O₅复合氧化物材料具有较好的表面酸性质和氧化还原性能，可在较低的反应温度时实现对典型有机分子的深度氧化，有望取代目前工业上焚烧垃圾时使用的V₂O₅-WO₃/TiO₂传统催化剂，避免使用具有较高毒性的V元素。

Abstract

WO₃-Nb₂O₅ mixed oxides were prepared by citric acid based sol-gel method, and were tested for catalytic combustion of 1000 ppmv monochlorobenzene (MCB), as a typical chlorinated aromatic hydrocarbon in air pollution. Research results for the structure-function relationship revealed that the physicochemical properties of WO₃-Nb₂O₅ were notably promoted than single component metal oxide, due to the strong electron interaction between W, Nb and O elements, which were confirmed by the techniques of H₂-TPR, positron lifetime spectra and XPS characterization. WO₃-Nb₂O₅ were amorphous, in which W and Nb elements were homogeneous dispersed. The functionalized materials contributed to the improvement of adsorption, activation, cracking and deep oxidation of MCB on the catalyst surface, and only non-negligible production of CO byproduct was detected. Both the acid property and oxidative property played important roles in the catalytic degradation process, and their cooperative catalytic effect could be optimized by the catalyst composition and preparation process. 2W1Nb (W/Nb = 2:1, molar ratio) displayed the largest acid amount and the best redox property, and thus it displayed the highest catalytic degradation performance, and 50% conversion of MCB was achieved at 280 °C with the GHSV of 9000 mL gcat⁻¹ h⁻¹. Besides, in the 120 h continuous reaction, only slight decrease (from 91% to 86%) for the catalytic activity of 2W1Nb was observed in initial 7 h, showing that it was desired towards the demanding conditions (such as resistance to water adsorption, chlorine poison and carbon deposition). Moreover, the WO₃-Nb₂O₅ materials also satisfied the environment-friendly and low-cost needs for environmental catalysis, which could be a promising alternative for traditional V₂O₅-WO₃/TiO₂ catalyst system.

该工作得到国家自然科学基金、浙江省自然科学基金、绍兴文理学院、省重点实验室开放基金等经费资助。近年来，杨鹏老师利用工业催化、环境催化学科的研究方法，发展了系列固体酸催化剂应用在VOCs治理领域，在研究我国铌矿、稀土元素的深层次加工和利用领域上已经取得了一系列成果。