Simultaneous catalytic reductions of NO and so2 by H2 over nickel-tungsten catalysts

Journal article

The simultaneous reductions of SO2 and NO by H2 on sulfided nickel-tungsten catalysts are investigated for the first time. Virtually 100% conversions of NO and SO2 with 100% and 90% selectivity toward nitrogen and sulfur, respectively, over sulfided NiW/Al 2O3 have been revealed at 550°C. As a result, this highly active and selective catalyst has been characterized extensively by X-ray diffraction, X-ray photoelectron spectroscopy, and Raman spectroscopy. It has been found that the oxidative leakage of lattice sulfur by NO results 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 SO 2 can, however, replenish the lost sulfur while maintaining the essential sulfide structure necessary for steady catalytic activity. Thus, a tentative reaction mechanism for the simultaneous reductions of SO2 and NO with H2 over this new sulfided NiW/Al2O3 catalyst is proposed. © 2008 American Chemical Society.

Authors: Li, X; Zhu, P; Wang, F; Wang, L; Tsang, S

• Journal: Journal of Physical Chemistry C
• Volume: 112
• Issue: 9
• Pages: 3376-3382
• Publication date: 2008-03-06
• DOI: 10.1021/jp076400r
• EISSN: 1932-7455
• ISSN: 1932-7447
• Language: English