{"title":"The promotion effect of Ce on Fe/BEA deNOx catalyst under high water content facing coalbed methane power generation","authors":"Jiangning Liu, Xuezhen Liu, Xianfeng Wu, Zhaoyang Fan, Xu Wu","doi":"10.1016/j.seppur.2024.131198","DOIUrl":null,"url":null,"abstract":"Coalbed methane (CBM) power generation is supposed as the most effective method to make utilization of low-concentration methane, efficient NO<sub>x</sub> removal from CBM power generation is of great significance. Distinguished from traditional coal-fired power plants and diesel vehicle, CBM power generation exhaust exhibited the characteristics of high temperature, high NO<sub>x</sub> concentration, high humidity, and high gas hourly space velocity, where the new challenges were proposed for NOx removal facing the CBM power generation. Under this background, the series of x wt% Fe + y wt% Ce/BEA denitrification catalysts with different iron and cerium contents (x = 1, 2, 3; y = 0, 1, 2) were fabricated via impregnation method and evaluated in the NH<sub>3</sub>-SCR reaction, where the optimized 2 wt% Fe/BEA and 1 wt% Fe + 1 wt% Ce/BEA catalysts were employed to further researched the HTA performance and H<sub>2</sub>O resistance under higher water content. The results indicated that the catalytic performance was obviously enhanced after introducing cerium, where the NO<sub>x</sub> conversion of 1 wt%Fe + 1 wt% Ce/BEA was above 95 % at 420–600 °C, after hydrothermal aging process, the 1 wt% Fe + 1 wt% Ce/BEA-H still possessed the favorable activity, besides, 1 wt% Fe + 1 wt% Ce/BEA also presented better performance even under the wet conditions. Characterization analysis revealed that the better performance of the 1 wt%Fe + 1 wt% Ce/BEA catalyst originated from the synergistic effects between iron, cerium and BEA support, which was attributed to the appropriate distribution of Fe<sup>3+</sup> content, redox ability, and the abundant acid sites, thus further leading to the excellent denitrification activity, high N<sub>2</sub> selectivity, and strong water resistance.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"24 1","pages":""},"PeriodicalIF":8.1000,"publicationDate":"2024-12-21","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.2024.131198","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
Coalbed methane (CBM) power generation is supposed as the most effective method to make utilization of low-concentration methane, efficient NOx removal from CBM power generation is of great significance. Distinguished from traditional coal-fired power plants and diesel vehicle, CBM power generation exhaust exhibited the characteristics of high temperature, high NOx concentration, high humidity, and high gas hourly space velocity, where the new challenges were proposed for NOx removal facing the CBM power generation. Under this background, the series of x wt% Fe + y wt% Ce/BEA denitrification catalysts with different iron and cerium contents (x = 1, 2, 3; y = 0, 1, 2) were fabricated via impregnation method and evaluated in the NH3-SCR reaction, where the optimized 2 wt% Fe/BEA and 1 wt% Fe + 1 wt% Ce/BEA catalysts were employed to further researched the HTA performance and H2O resistance under higher water content. The results indicated that the catalytic performance was obviously enhanced after introducing cerium, where the NOx conversion of 1 wt%Fe + 1 wt% Ce/BEA was above 95 % at 420–600 °C, after hydrothermal aging process, the 1 wt% Fe + 1 wt% Ce/BEA-H still possessed the favorable activity, besides, 1 wt% Fe + 1 wt% Ce/BEA also presented better performance even under the wet conditions. Characterization analysis revealed that the better performance of the 1 wt%Fe + 1 wt% Ce/BEA catalyst originated from the synergistic effects between iron, cerium and BEA support, which was attributed to the appropriate distribution of Fe3+ content, redox ability, and the abundant acid sites, thus further leading to the excellent denitrification activity, high N2 selectivity, and strong water resistance.
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.