{"title":"The performance and mechanism of transition metal oxide (Fe, Cu, Mn, Ce) on selective catalytic reduction of NO over ZSM-5.","authors":"Xuetao Wang, Chongfei Liu, Haipeng Hu, Lili Xing, Haojie Li, Mengjie Liu, Linfeng Miao","doi":"10.1080/09593330.2025.2474259","DOIUrl":null,"url":null,"abstract":"<p><p>Different transition metals (Fe, Cu, Mn, Ce) were used to prepare and characterise catalysts on ZSM-5 via impregnation, for the selective reduction of NO with NH<sub>3</sub>. The Fe/ZSM-5 catalyst exhibited excellent NH<sub>3</sub>-SCR activity in the 350-450°C temperature range, with a 96.91% NO conversion rate at 431°C. Moreover, the Ce/ZSM-5 and Cu/ZSM-5 catalysts showed superior catalytic activity at low temperatures (88.33% at 250°C and 91.82% at 289°C), while the Mn-modified catalysts exhibited a poor denitrification performance. The results also revealed that metal oxides improved metal ion dispersion, and the Fe and Cu active components were well distributed on the surface of the carrier. Moreover, Lewis acid sites predominately occurred in the active components of the Fe and Cu species, which increases the adsorption capacity. Among the four different metal-supported catalysts, Cu-ZSM-5 had the smallest activation energy. Highly dispersed metal ion active nanoparticles, improved redox properties, and rich acid centres are conducive to the reaction. The In-situ DRIFTs study found that Lewis acid sites play an important role in the denitrification reaction. The apparent reaction activation energy of Cu-ZSM-5 catalyst in four different metal-supported catalysts is the smallest, with an activation energy of 35.1 kJ mol<sup>-1</sup>.</p>","PeriodicalId":12009,"journal":{"name":"Environmental Technology","volume":" ","pages":"1-14"},"PeriodicalIF":2.2000,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Environmental Technology","FirstCategoryId":"93","ListUrlMain":"https://doi.org/10.1080/09593330.2025.2474259","RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}
引用次数: 0
Abstract
Different transition metals (Fe, Cu, Mn, Ce) were used to prepare and characterise catalysts on ZSM-5 via impregnation, for the selective reduction of NO with NH3. The Fe/ZSM-5 catalyst exhibited excellent NH3-SCR activity in the 350-450°C temperature range, with a 96.91% NO conversion rate at 431°C. Moreover, the Ce/ZSM-5 and Cu/ZSM-5 catalysts showed superior catalytic activity at low temperatures (88.33% at 250°C and 91.82% at 289°C), while the Mn-modified catalysts exhibited a poor denitrification performance. The results also revealed that metal oxides improved metal ion dispersion, and the Fe and Cu active components were well distributed on the surface of the carrier. Moreover, Lewis acid sites predominately occurred in the active components of the Fe and Cu species, which increases the adsorption capacity. Among the four different metal-supported catalysts, Cu-ZSM-5 had the smallest activation energy. Highly dispersed metal ion active nanoparticles, improved redox properties, and rich acid centres are conducive to the reaction. The In-situ DRIFTs study found that Lewis acid sites play an important role in the denitrification reaction. The apparent reaction activation energy of Cu-ZSM-5 catalyst in four different metal-supported catalysts is the smallest, with an activation energy of 35.1 kJ mol-1.
期刊介绍:
Environmental Technology is a leading journal for the rapid publication of science and technology papers on a wide range of topics in applied environmental studies, from environmental engineering to environmental biotechnology, the circular economy, municipal and industrial wastewater management, drinking-water treatment, air- and water-pollution control, solid-waste management, industrial hygiene and associated technologies.
Environmental Technology is intended to provide rapid publication of new developments in environmental technology. The journal has an international readership with a broad scientific base. Contributions will be accepted from scientists and engineers in industry, government and universities. Accepted manuscripts are generally published within four months.
Please note that Environmental Technology does not publish any review papers unless for a specified special issue which is decided by the Editor. Please do submit your review papers to our sister journal Environmental Technology Reviews at http://www.tandfonline.com/toc/tetr20/current