• investigations of surface vox species and their contributions to activities of vox/ti0.5sn0.5o2 catalysts toward selective catalytic reduction of no by nh3

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
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     high surface area ti0.5sn0.5o2 mixed oxide with rutile phase was prepared by a coprecipitation method. the surface area of ti0.5sn0.5o2 sample is 76.7 m2 g−1, and vox/ti0.5sn0.5o2 catalysts were prepared using the mixed oxide as support. characterizations using xrd, ft-ir, lrs, epr, uv–vis, and tem demonstrated that vanadium oxide species are highly dispersed on the surface of ti0.5sn0.5o2 support when the loading amount of vanadium oxide is ≤1.5 mmol v/100 m2 ti0.5sn0.5o2. the dispersed vanadium oxide species form epitaxial-growth layer on the support. in situ ft-ir (nh3 adsorption), combined with nh3-tpd, indicate that the catalyst with vanadium loading amount of 1.5 mmol v/100 m2 ti0.5sn0.5o2, which equals to the dispersion capability, possesses a maximum amount of brønsted acid sites. the 1.5v/ti0.5sn0.5o2 catalyst exhibits the best catalytic performance and good resistance to water vapor poison for the “no + nh3 + o2” reaction, indicating that surface dispersed polymeric vanadium oxide species are the primary active species. a possible reaction mechanism is proposed on the basis of in situ ft-ir results.

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