Influence of support properties on H2 selective catalytic reduction activities and N2 selectivities of Pt catalysts

doi:10.1016/S1872-2067(14)60197-2

Abstract

Abstract:

The selective catalytic reduction of NO_x by H₂ (H₂-SCR) was studied over Pt/MgO, Pt/γ-Al₂O₃, Pt/ZrO₂, and Pt/HZSM-5 catalysts. The H₂-SCR activities and N₂ selectivities of the catalysts were strongly influenced by the amounts of Pt metal in the catalysts and the NO_x adsorption capacities of the supports. The acidic surface of HZSM-5 increased the amount of metallic Pt on the support, decreasing the NO_x adsorption capacity, resulting in much higher H₂-SCR activity and N₂ selectivity. The inferior activities of Pt/MgO and Pt/γ-Al₂O₃ are ascribed to the low amounts of metallic Pt and large NO_x adsorption capacities of the supports as a result of their basic surfaces. Based on these results and in situ Fourier transform infrared spectroscopic studies of the reaction, it is proposed that the reduction products of nitrite/nitrate species at the Pt/support interface are N₂ or N₂O, depending on the relative amounts of active hydrogen and nitrous species involved in the reduction.

Key words: Hydrogen activation, Nitrogen oxide adsorption, Selective catalytic reduction, Nitrogen selectivity, Hydrogen-spillover

Xinyan Li, Xiaoxiao Zhang, Yongzhen Xu, Ye Liu, Xinping Wang. Influence of support properties on H₂ selective catalytic reduction activities and N₂ selectivities of Pt catalysts[J]. Chinese Journal of Catalysis, 2015, 36(2): 197-203.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(14)60197-2

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Influence of support properties on H₂ selective catalytic reduction activities and N₂ selectivities of Pt catalysts

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