Vanadium-doped titania-pillared montmorillonite clay as a catalyst for selective catalytic reduction of NO by ammonia

Polish Academy of Sciences, Institute of Catalysis and Surface Chemistry, Cracow, Poland

A series of V-doped titania-pillared clay catalysts, characterized by ICP-AES chemical analysis, X-ray diffraction, BET surface area measurement, and ESR spectroscopy, have been tested in the selective catalytic reduction of NO by NH ₃ . An ESR analysis shows that V dopant is anchored to the titania pillars. Vanadyl species with differing degrees of in-plane V-O pi -covalent bonding are produced depending on the method of sample preparation. Polymeric V species appear as the V content is increased. Catalytic performance of these systems depends on the method of preparation and on the V content. The best catalyst, converting 90-100% NO in the temperature range 523-623 K, is obtained by exchange of pillared montmorillonite with vanadyl ions, at an extent of exchange below the level where significant amounts of polymeric V species appear. The co-pillared catalyst, containing vanadyl centres characterized by a higher degree of in-plane pi -covalent bonding (according to ESR), is less selective than the exchanged samples.

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				A. Romero, F. Dorado, I. Asencio, P. B. Garcia, and J. L. Valverde Ti-PILLARED CLAYS: SYNTHESIS AND GENERAL CHARACTERIZATION Clays and Clay Minerals, December 1, 2006; 54(6): 737 - 747. [Abstract] [Full Text] [PDF]