{"title":"Unraveling the opposite behaviors of Pt/MOx catalysts for toluene and o-xylene mixture oxidation: Modulating mixing effect by optimization supports","authors":"Qiuling Wang, Jing Li, Song Wu, Jingping Feng, Jiali Lu, Zuliang Wu, Erhao Gao, Wei Wang, Jiali Zhu, Shuiliang Yao, Nanhua Wu","doi":"10.1016/j.seppur.2024.130536","DOIUrl":null,"url":null,"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/Co<sub>3</sub>O<sub>4</sub>, Pt/Nb<sub>2</sub>O<sub>5</sub> and Pt/CeO<sub>2</sub>) were investigated. Pt/Nb<sub>2</sub>O<sub>5</sub> and Pt/CeO<sub>2</sub> catalysts significantly promoted the oxidation of mixture. However, Pt/NiO and Pt/Co<sub>3</sub>O<sub>4</sub> catalysts exhibited more difficulties in degrading mixed VOCs. Characterization results revealed that Pt/NiO and Pt/Co<sub>3</sub>O<sub>4</sub> possessed higher percentage of surface adsorbed oxygen. Pt/Nb<sub>2</sub>O<sub>5</sub> and Pt/CeO<sub>2</sub> had more surface lattice oxygen, Pt<sup>0</sup> species and acid sites. The weak competitive adsorption over Pt/Nb<sub>2</sub>O<sub>5</sub> and Pt/CeO<sub>2</sub> catalysts might be related to their acidic and electronic properties. <em>In situ</em> experiments proved that surface adsorbed oxygen and surface lattice oxygen of Pt/CeO<sub>2</sub> could oxidize toluene and o-xylene simultaneously at lower temperature. However, the depleted oxygen species on Pt/Co<sub>3</sub>O<sub>4</sub> 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.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"129 1","pages":""},"PeriodicalIF":8.1000,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Separation and Purification Technology","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1016/j.seppur.2024.130536","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
引用次数: 0
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.
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.
京公网安备 11010802042870号
京ICP备2023020795号-1
分享
求助内容：
应助结果提醒方式：
扫码关注我们
