Selective Catalytic Reduction of NOx by Ethanol and Removal of By-products over Combined Catalyst (Ag/Al2O3+Cu/Ce(x)/Al2O3)

Abstract

Abstract: The selective catalytic reduction of NOx by ethanol and the removal of by-products (CO and unburned hydrocarbons) were studied over (Ag/Al2O3+Cu/Ce(x)/Al2O3) (x: molar ratio of Ce to Al) combined catalysts. The combined catalysts showed similar NOx reduction activity to Ag/Al2O3 in the temperature range of 200-350 ℃. CO oxidation capabilities of the oxidation catalysts were improved with increasing Ce/Al ratio. Cu/CeO2 showed the best oxidation activity of CO but caused obvious decrease of NOx conversion when it was directly placed after Ag/Al2O3. (Ag/Al2O3+Cu/Ce(0.15)/Al2O3) was the best in the combined catalysts considering the conversions of NOx, CO, and hydrocarbons. The Cu/Ce(x)/Al2O3 oxidation catalysts were characterized by BET surface area measurement,X-raydiffraction, H2 temperature-programmed reduction, andX-rayphotoelectron spectroscopy. The results showed that the interaction between Cu and Ce is the main factor causing the improvement of CO oxidation.

Key words: silver, alumina, oxidation catalyst, copper oxide, cerium oxide, nitrogen oxide, ethanol, selective catalytic reduction, carbon monoxide, unburned hydrocarbons

SONG Xiaoping;ZHANG Changbin;HE Hong*. Selective Catalytic Reduction of NOx by Ethanol and Removal of By-products over Combined Catalyst (Ag/Al2O3+Cu/Ce(x)/Al2O3)[J]. Chinese Journal of Catalysis, 2008, 29(6): 524-530.

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Selective Catalytic Reduction of NOx by Ethanol and Removal of By-products over Combined Catalyst (Ag/Al2O3+Cu/Ce(x)/Al2O3)

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