Unraveling the opposite behaviors of Pt/MOx catalysts for toluene and o-xylene mixture oxidation: Modulating mixing effect by optimization supports

IF 8.1 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology Pub Date : 2024-11-14 DOI:10.1016/j.seppur.2024.130536

Qiuling Wang , Jing Li , Song Wu , Jingping Feng , Jiali Lu , Zuliang Wu , Erhao Gao , Wei Wang , Jiali Zhu , Shuiliang Yao , Nanhua Wu

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Abstract

Actual industrial emissions usually contain multiple aromatic VOCs, but little is known about adsorption and oxidation behaviors of multicomponent aromatic VOCs over catalysts, which limits the practical application of catalytic oxidation technology. Herein, the adsorption and oxidation of toluene and o-xylene mixture generated during paint production over Pt-based supported catalysts (Pt/NiO, Pt/Co₃O₄, Pt/Nb₂O₅ and Pt/CeO₂) were investigated. Pt/Nb₂O₅ and Pt/CeO₂ catalysts significantly promoted the oxidation of mixture. However, Pt/NiO and Pt/Co₃O₄ catalysts exhibited more difficulties in degrading mixed VOCs. Characterization results revealed that Pt/NiO and Pt/Co₃O₄ possessed higher percentage of surface adsorbed oxygen. Pt/Nb₂O₅ and Pt/CeO₂ had more surface lattice oxygen, Pt⁰ species and acid sites. The weak competitive adsorption over Pt/Nb₂O₅ and Pt/CeO₂ catalysts might be related to their acidic and electronic properties. In situ experiments proved that surface adsorbed oxygen and surface lattice oxygen of Pt/CeO₂ could oxidize toluene and o-xylene simultaneously at lower temperature. However, the depleted oxygen species on Pt/Co₃O₄ could not be replenished in time due to the strong competitive adsorption and different oxidation mechanisms. This study uncovers the mixing effect of toluene and o-xylene over Pt/MOx catalysts, which provides a guiding direction towards the development of catalysts for efficient degradation of multicomponent VOCs.

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揭示 Pt/MOx 催化剂在甲苯和邻二甲苯混合物氧化中的相反行为：通过优化支撑物调节混合效应

实际工业排放物通常含有多种芳香族挥发性有机化合物，但人们对多组分芳香族挥发性有机化合物在催化剂上的吸附和氧化行为知之甚少，这限制了催化氧化技术的实际应用。本文研究了涂料生产过程中产生的甲苯和邻二甲苯混合物在铂基支撑催化剂（Pt/NiO、Pt/Co3O4、Pt/Nb2O5 和 Pt/CeO2）上的吸附和氧化。Pt/Nb2O5 和 Pt/CeO2 催化剂显著促进了混合物的氧化。然而，Pt/NiO 和 Pt/Co3O4 催化剂在降解混合挥发性有机化合物时表现得更为困难。表征结果表明，Pt/NiO 和 Pt/Co3O4 的表面吸附氧比例较高。Pt/Nb2O5 和 Pt/CeO2 具有更多的表面晶格氧、Pt0 物种和酸性位点。Pt/Nb2O5 和 Pt/CeO2 催化剂上的弱竞争吸附可能与它们的酸性和电子特性有关。原位实验证明，Pt/CeO2 的表面吸附氧和表面晶格氧可以在较低温度下同时氧化甲苯和邻二甲苯。然而，由于强烈的竞争吸附和不同的氧化机制，Pt/Co3O4 上耗尽的氧物种无法得到及时补充。该研究揭示了甲苯和邻二甲苯在 Pt/MOx 催化剂上的混合效应，为开发高效降解多组分挥发性有机化合物的催化剂提供了指导方向。

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

Separation and Purification Technology 工程技术-工程：化工

CiteScore

14.00

自引率

12.80%

发文量

2347

审稿时长

43 days

期刊介绍： Separation and Purification Technology is a premier journal committed to sharing innovative methods for separation and purification in chemical and environmental engineering, encompassing both homogeneous solutions and heterogeneous mixtures. Our scope includes the separation and/or purification of liquids, vapors, and gases, as well as carbon capture and separation techniques. However, it's important to note that methods solely intended for analytical purposes are not within the scope of the journal. Additionally, disciplines such as soil science, polymer science, and metallurgy fall outside the purview of Separation and Purification Technology. Join us in advancing the field of separation and purification methods for sustainable solutions in chemical and environmental engineering.