Selective Catalytic Reduction of Nitrogen Oxide by Propene over Noble CatalystSIn the Pressence of Exess Oxygen

Abstract

Abstract: The selective catalytic reduction(SCR) of nitrogen oxides by hydrocarbonSIs considered to be one of the most efficient ways to remove NO from lean burn automobile exhaust.The single noble metals Pt, Pd and Rh catalysts and two catalytic active components(Pt-Pd, Pt-Rh, Pd-Rh) based on the γ-alumina were prepared by the sol-gel and the selective catalytic reduction activity of NO with propene(C₃H₆) as reductant in the presence of excess oxygen waSInvestigated in a fixed-bed microreactor.The results show that the order of activity for NO conversion and their optimal temperature is Rh (73%, 375℃)>Pt(65%, 225℃)>Pd(47%, 275℃), Pd and Rh have a higher activity for NO reduction to N₂than that of Pt, while Pt-Al₂O₃has a high activity for NO oxidation to NO₂, but the lowest selectivity for NO to N_2.The temperature ranges of the two catalytic active components catalysts for NO reduction have been broaden in comparison with the different temperature ranges of single catalytic component catalyst.The combined Pt-Rh catalyst is the most active among them.In different combination of Pt-Al₂O₃and Rh-Al₂O₃with physically mixed catalysts and packed with two-stage catalysts, it is found that the two-stage catalysts have a better activity than that of the other combinationSIn a wide temperature range(200-450 ℃) because the reductant C₃H₆can be used efficiently, and this combined catalyst may be a potential candidates for practical use in the future.

Key words: Lean-burn automobile exhaust, Noble metal catalyst, NO reduction, Selective catalytic reduction, Synergistic effect

CLC Number:

O643.3

TrendMD:

LI Jun-Hua, HAO Ji-Ming, FU Li-Xin, ZHU Tian-Le, CHEN Ling-Lin . Selective Catalytic Reduction of Nitrogen Oxide by Propene over Noble CatalystSIn the Pressence of Exess Oxygen[J]. Chem. J. Chinese Universities, 2003, 24(11): 2060.

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Selective Catalytic Reduction of Nitrogen Oxide by Propene over Noble CatalystSIn the Pressence of Exess Oxygen

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