Mechanismic Studies on the Selective Reduction of NO by CH4 over an In/HZSN-5 Catalyst

Abstract

Abstract: CH₄ oxidations in CH₄+O₂, NO+CH₄(+O₂) and NO₂+CH₄(+O₂) reaction systems over the catalyst of indium impregnated on HZSM-5(In/HZSM-5) were studied. The efficacies of O₂, NOand NO₂ for CH₄ oxidation were evaluated. The dramatically different conversions of CH₄ in these different reaction systems suggested that NO₂ played a key role in CH₄ conversion. TPDstudies of CH₄, O₂, NOand NO₂ on HZSM-5 and In/HZSM-5 were also investigated. It was found that only NO_x could absorb on the samples and the chemisorbed amount of NO₂ was much larger than that of NO. This illustrated that the absorbed NO₂ species were very important in the CH₄-SCRprocess. Our TPDresults and IRresults from the literatures both indicated that not only the acid sites but also the In sites in the In/HZSM-5 catalyst facilitated the formation of NO₂. Moreover, the reaction between NO₂ and CH₄ took place on the In sites.

Key words: Mechanism, Selective reduction, Nitrogen oxide, Methane, Indium/HZSM-5

CLC Number:

O643

TrendMD:

WANG Xiao-Dong, MA Lei, ZHANG Tao, BAO Xin-He, SUN Xiao-Ying, LIANG Dong-Bai, LIN Li-Wu. Mechanismic Studies on the Selective Reduction of NO by CH₄ over an In/HZSN-5 Catalyst[J]. Chem. J. Chinese Universities, 2000, 21(7): 1105.

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Mechanismic Studies on the Selective Reduction of NO by CH₄ over an In/HZSN-5 Catalyst

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