期刊
CATALYSIS TODAY
卷 164, 期 1, 页码 480-483出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cattod.2010.11.008
关键词
NO-SCR; DME; Metal loaded Al2O3
The selective catalytic reduction (SCR) of NO by dimethyl ether (DME) has been investigated over various noble metal loaded Al2O3 catalysts. It was found that Ag loaded Al2O3 was much more active than Rh, Pd, and Pt loaded ones. Further improvement of the low-temperature performance of Ag/Al2O3 between 200 degrees C and 300 degrees C was attempted by the addition of various amounts of Ba species; an Al2O3 supported Ag (1 wt.%) catalyst promoted by 0.2 wt.% Ba was the most effective for DME-SCR. UV-vis spectra showed that Ag+ ion played an important role in the reaction and the addition of Ba increased the amount of this active species. Furthermore, FTIR measurements indicated that the formation of such reaction intermediates as -NCO and -CN was promoted by the isolated Ag+ ions, resulting in the higher activity for DME-SCR. (C) 2010 Elsevier B. V. All rights reserved.
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