Simultaneous Catalytic Reductions of NO and SO2 by H2 over Nickel-Tungsten Catalysts
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- 作者：Xuehui Li ; Peng Zhu ; Furong Wang ; Lefu Wang ; Shik Chi Tsang
- 刊名：Journal of Physical Chemistry C
- 出版年：2008
- 出版时间：March 6, 2008
- 年：2008
- 卷：112
- 期：9
- 页码：3376 - 3382
- 全文大小：173K
- 年卷期：v.112,no.9(March 6, 2008)
- ISSN：1932-7455
文摘
The simultaneous reductions of SO2 and NO by H2 on sulfided nickel-tungsten catalysts are investigated forthe first time. Virtually 100% conversions of NO and SO2 with 100% and 90% selectivity toward nitrogenand sulfur, respectively, over sulfided NiW/Al2O3 have been revealed at 550 
C. As a result, this highlyactive and selective catalyst has been characterized extensively by X-ray diffraction, X-ray photoelectronspectroscopy, and Raman spectroscopy. It has been found that the oxidative leakage of lattice sulfur by NOresults in a rapid deactivation of this sulfided catalyst in both NO decomposition and the NO reduction reaction.The sulfur produced from the hydrogen reduction of SO2 can, however, replenish the lost sulfur whilemaintaining the essential sulfide structure necessary for steady catalytic activity. Thus, a tentative reactionmechanism for the simultaneous reductions of SO2 and NO with H2 over this new sulfided NiW/Al2O3 catalystis proposed.
C. As a result, this highlyactive and selective catalyst has been characterized extensively by X-ray diffraction, X-ray photoelectronspectroscopy, and Raman spectroscopy. It has been found that the oxidative leakage of lattice sulfur by NOresults in a rapid deactivation of this sulfided catalyst in both NO decomposition and the NO reduction reaction.The sulfur produced from the hydrogen reduction of SO2 can, however, replenish the lost sulfur whilemaintaining the essential sulfide structure necessary for steady catalytic activity. Thus, a tentative reactionmechanism for the simultaneous reductions of SO2 and NO with H2 over this new sulfided NiW/Al2O3 catalystis proposed.