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کاتالیزور کاربردی a: عمومی 2012
جزئیات رویداد
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  • effect of h2o on catalytic performance of manganese oxides in no reduction by nh3

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
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     the effects of h2o on catalytic performance of hollandite manganese oxide (hmo) and β-mno2 are comparatively studied in selective catalytic reduction of no by nh3 (nh3-scr). the results showed that the hmo possessed higher catalytic activity than β-mno2 in the presence of h2o, and the nh3-scr reaction occurring on the hmo predominantly followed an eley-rideal mechanism via reacting adsorbed nh4+ with gaseous no. according to the nh3-tpd analyses, xps results and the hrtem observations coupled with the theoretical calculations, the results elucidated that (i) the initial formation of the nh4+(h2o)3oh− double ionic clusters were energetically favorable in the presence of h2o, (ii) the oh− ions from the double ionic clusters reacted with lewis acid sites of the manganese oxides to transform into brönsted acid ones, concomitant with release of the nh4+ ions, and (iii) the nh4+ ions both from the double ionic clusters and from reaction of nh3 with brönsted acid sites can be efficiently adsorbed on the {1 1 0} facets of the hmo to complete the nh3-scr reaction cycles, whereas the nh4+ ions are not stable on the {1 1 0} facets of β-mno2. therefore, the excellent catalytic performance of the hmo predominantly originates from the special structural {1 1 0} facet due to it being suitable for adsorption of nh4+ active species.

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