REDUCTION OF NO BY CO OVER NiWO4, NiO, AND WO3 CATALYSTS |
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Authors: | Juan M Quintana-Melgoza Antonio Gómez-cortés and Miguel Avalos-Borja |
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Institution: | (1) Centro de Investigación Científica y de Educación Superior de Ensenada, México;(2) Centro de Ciencias de la Materia Condensada, UNAM, Apdo. Postal 2681, Ensenada, B.C, 22800, México;(3) Instituto de Física, Universidad Nacional Autónoma de México, A. Postal 20-364, México, 01000, D.F;(4) Centro de Ciencias de la Materia Condensada, UNAM, Apdo. Postal 2681, Ensenada, B.C, 22800, México |
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Abstract: | We present a comparative study of NiWO4, NiO, and WO3 catalysts for simultaneous conversion of NO and CO. Samples were synthesized by reacting ammonium metatungstate and/or nickel nitrate at high temperature (773 K to 903 K) under an oxygen stream. Catalysts were characterized by X-ray diffraction, surface area measurements, energy dispersive spectroscopy and scanning electron microscopy. The catalytic reduction of NO by CO took place in the temperature range (523 to 973) K under highly reductive conditions (NO:CO= 1:5) over NiWO4NiO, and WO3, respectively. The 100 % NO conversion at GHSV of 11460 h-1 was achieved at 773 K over NiWO4 and at 848 K over NiO. The WO3 was deactivated at 898 K. However, in the range (523 to 723) K NiO was more active than NiWO4 and WO3 catalysts. |
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Keywords: | nitric oxide carbon monoxide Oxides reduction |
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