Bi-jun WU , Xiao-qin LIU , Ping XIAO , Shu-gang WANG
{"title":"二氧化钛负载二元金属氧化物催化剂在NH3低温选择性催化还原NOx中的应用","authors":"Bi-jun WU , Xiao-qin LIU , Ping XIAO , Shu-gang WANG","doi":"10.1016/S1005-9040(08)60129-4","DOIUrl":null,"url":null,"abstract":"<div><p>Binary metal oxide(MnO<sub><em>x</em></sub>-A/TiO<sub>2</sub>) catalysts were prepared by adding the second metal to manganese oxides supported on titanium dioxide(TiO<sub>2</sub>), where, A indicates Fe<sub>2</sub>O<sub>3</sub>, WO<sub>3</sub>, MoO<sub>3</sub>, and Cr<sub>2</sub>O<sub>3</sub>. Their catalytic activity, N<sub>2</sub> selectivity, and SO<sub>2</sub> poisonous tolerance were investigated. The catalytic performance at low temperatures decreased in the following order: Mn-W/TiO<sub>2</sub>>Mn-Fe/TiO<sub>2</sub>>Mn-Cr/TiO<sub>2</sub>>Mn-Mo/TiO<sub>2</sub>, whereas the N<sub>2</sub> selectivity decreased in the order: Mn-Fe/TiO<sub>2</sub>>Mn-W/TiO<sub>2</sub>>Mn-Mo/TiO<sub>2</sub>>Mn-Cr/TiO<sub>2</sub>. In the presence of 0.01% SO<sub>2</sub> and 6% H<sub>2</sub>O, the NO<sub><em>x</em></sub> conversions in the presence of Mn-W/TiO<sub>2</sub>, Mn-Fe/TiO<sub>2</sub>, or Mn-Mo/TiO<sub>2</sub> maintain 98.5%, 95.8% and 94.2%, respectively, after 8 h at 120 °C at GHSV 12600 h<sup>-1</sup>. As effective promoters, WO<sub>3</sub> and Fe<sub>2</sub>O<sub>3</sub> can increase N<sub>2</sub> selectivity and the resistance to SO<sub>2</sub> of MnO<sub><em>x</em></sub>/TiO<sub>2</sub> significantly. The Fourier transform infrared(FTIR) spectra of NH<sub>3</sub> over WO<sub>3</sub> show the presence of Lewis acid sites. The results suggest that WO<sub>3</sub> is the best promoter of MnO<sub><em>x</em></sub>/TiO<sub>2</sub>, and Mn-W/TiO<sub>2</sub> is one of the most active catalysts for the low temperature selective catalytic reduction of NO with NH<sub>3</sub>.</p></div>","PeriodicalId":9785,"journal":{"name":"Chemical Research in Chinese Universities","volume":"24 5","pages":"Pages 615-619"},"PeriodicalIF":3.1000,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1005-9040(08)60129-4","citationCount":"6","resultStr":"{\"title\":\"TiO2-Supported Binary Metal Oxide Catalysts for Low-temperature Selective Catalytic Reduction of NOx with NH3\",\"authors\":\"Bi-jun WU , Xiao-qin LIU , Ping XIAO , Shu-gang WANG\",\"doi\":\"10.1016/S1005-9040(08)60129-4\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Binary metal oxide(MnO<sub><em>x</em></sub>-A/TiO<sub>2</sub>) catalysts were prepared by adding the second metal to manganese oxides supported on titanium dioxide(TiO<sub>2</sub>), where, A indicates Fe<sub>2</sub>O<sub>3</sub>, WO<sub>3</sub>, MoO<sub>3</sub>, and Cr<sub>2</sub>O<sub>3</sub>. Their catalytic activity, N<sub>2</sub> selectivity, and SO<sub>2</sub> poisonous tolerance were investigated. The catalytic performance at low temperatures decreased in the following order: Mn-W/TiO<sub>2</sub>>Mn-Fe/TiO<sub>2</sub>>Mn-Cr/TiO<sub>2</sub>>Mn-Mo/TiO<sub>2</sub>, whereas the N<sub>2</sub> selectivity decreased in the order: Mn-Fe/TiO<sub>2</sub>>Mn-W/TiO<sub>2</sub>>Mn-Mo/TiO<sub>2</sub>>Mn-Cr/TiO<sub>2</sub>. In the presence of 0.01% SO<sub>2</sub> and 6% H<sub>2</sub>O, the NO<sub><em>x</em></sub> conversions in the presence of Mn-W/TiO<sub>2</sub>, Mn-Fe/TiO<sub>2</sub>, or Mn-Mo/TiO<sub>2</sub> maintain 98.5%, 95.8% and 94.2%, respectively, after 8 h at 120 °C at GHSV 12600 h<sup>-1</sup>. As effective promoters, WO<sub>3</sub> and Fe<sub>2</sub>O<sub>3</sub> can increase N<sub>2</sub> selectivity and the resistance to SO<sub>2</sub> of MnO<sub><em>x</em></sub>/TiO<sub>2</sub> significantly. The Fourier transform infrared(FTIR) spectra of NH<sub>3</sub> over WO<sub>3</sub> show the presence of Lewis acid sites. The results suggest that WO<sub>3</sub> is the best promoter of MnO<sub><em>x</em></sub>/TiO<sub>2</sub>, and Mn-W/TiO<sub>2</sub> is one of the most active catalysts for the low temperature selective catalytic reduction of NO with NH<sub>3</sub>.</p></div>\",\"PeriodicalId\":9785,\"journal\":{\"name\":\"Chemical Research in Chinese Universities\",\"volume\":\"24 5\",\"pages\":\"Pages 615-619\"},\"PeriodicalIF\":3.1000,\"publicationDate\":\"2008-09-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1016/S1005-9040(08)60129-4\",\"citationCount\":\"6\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Chemical Research in Chinese Universities\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S1005904008601294\",\"RegionNum\":4,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"CHEMISTRY, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Chemical Research in Chinese Universities","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1005904008601294","RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
TiO2-Supported Binary Metal Oxide Catalysts for Low-temperature Selective Catalytic Reduction of NOx with NH3
Binary metal oxide(MnOx-A/TiO2) catalysts were prepared by adding the second metal to manganese oxides supported on titanium dioxide(TiO2), where, A indicates Fe2O3, WO3, MoO3, and Cr2O3. Their catalytic activity, N2 selectivity, and SO2 poisonous tolerance were investigated. The catalytic performance at low temperatures decreased in the following order: Mn-W/TiO2>Mn-Fe/TiO2>Mn-Cr/TiO2>Mn-Mo/TiO2, whereas the N2 selectivity decreased in the order: Mn-Fe/TiO2>Mn-W/TiO2>Mn-Mo/TiO2>Mn-Cr/TiO2. In the presence of 0.01% SO2 and 6% H2O, the NOx conversions in the presence of Mn-W/TiO2, Mn-Fe/TiO2, or Mn-Mo/TiO2 maintain 98.5%, 95.8% and 94.2%, respectively, after 8 h at 120 °C at GHSV 12600 h-1. As effective promoters, WO3 and Fe2O3 can increase N2 selectivity and the resistance to SO2 of MnOx/TiO2 significantly. The Fourier transform infrared(FTIR) spectra of NH3 over WO3 show the presence of Lewis acid sites. The results suggest that WO3 is the best promoter of MnOx/TiO2, and Mn-W/TiO2 is one of the most active catalysts for the low temperature selective catalytic reduction of NO with NH3.
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