{"title":"Selective catalytic reduction of NO by C2H2 over Ce-Al2O3 catalyst with rate-determining step of NO oxidation","authors":"Suhua Yan, Xinping Wang, Wenchen Wang, Zequn Liu, Jiahao Niu","doi":"10.1016/S1003-9953(11)60373-3","DOIUrl":null,"url":null,"abstract":"<div><p>Ce-Al<sub>2</sub>O<sub>3</sub> catalysts prepared by co-precipitation are investigated both in NO oxidation by O<sub>2</sub> and in selective catalytic reduction of NO by C<sub>2</sub>H<sub>2</sub> (C<sub>2</sub>H<sub>2</sub>-SCR). It is found that C<sub>2</sub>H<sub>2</sub>-SCR is initiated and controlled by NO oxidation to NO<sub>2</sub> over Al<sub>2</sub>O<sub>3</sub>. Ce loading on Al<sub>2</sub>O<sub>3</sub> is almost inactive for NO oxidation below 350°C, since NO<sub>2</sub> strongly adsorbs on cerium oxide, leading to the active sites being blocked, which was characterized by temperature-programmed desorption of NO and NO<sub>2</sub> and Fourier transform infrared spectroscopy after NO+O<sub>2</sub> coadsorption over the samples. However, in the case of C<sub>2</sub>H<sub>2</sub>-SCR, Ce loading on Al<sub>2</sub>O<sub>3</sub> significantly improves the reaction by accelerating the NO oxidation step in the temperature range of 250–450°C, since the nitrate species produced by NO<sub>2</sub> adsorption is an active intermediate required by C<sub>2</sub>H<sub>2</sub>-SCR.</p></div>","PeriodicalId":56116,"journal":{"name":"Journal of Natural Gas Chemistry","volume":"21 3","pages":"Pages 332-338"},"PeriodicalIF":0.0000,"publicationDate":"2012-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1003-9953(11)60373-3","citationCount":"9","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Natural Gas Chemistry","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1003995311603733","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 9
Abstract
Ce-Al2O3 catalysts prepared by co-precipitation are investigated both in NO oxidation by O2 and in selective catalytic reduction of NO by C2H2 (C2H2-SCR). It is found that C2H2-SCR is initiated and controlled by NO oxidation to NO2 over Al2O3. Ce loading on Al2O3 is almost inactive for NO oxidation below 350°C, since NO2 strongly adsorbs on cerium oxide, leading to the active sites being blocked, which was characterized by temperature-programmed desorption of NO and NO2 and Fourier transform infrared spectroscopy after NO+O2 coadsorption over the samples. However, in the case of C2H2-SCR, Ce loading on Al2O3 significantly improves the reaction by accelerating the NO oxidation step in the temperature range of 250–450°C, since the nitrate species produced by NO2 adsorption is an active intermediate required by C2H2-SCR.
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