Supercritical water syntheses of transition metal-doped CeO2nano-catalysts for selective catalytic reduction of NO by CO: An in situ diffuse reflectance Fourier transform infrared spectroscopy study

doi:10.1016/S1872-2067(17)63008-0

Abstract

Abstract:

In the present study, we synthesized CeO₂ catalysts doped with various transition metals (M=Co, Fe, or Cu) using a supercritical water hydrothermal route, which led to the incorporation of the metal ions in the CeO₂ lattice, forming solid solutions. The catalysts were then used for the selective catalytic reduction (SCR) of NO by CO. The Cu-doped catalyst exhibited the highest SCR activity; it had a T₅₀ (i.e., 50% NO conversion) of only 83℃ and a T₉₀ (i.e., 90% NO conversion) of 126℃. Such an activity was also higher than in many state-of-the-art catalysts. In situ diffuse reflectance Fourier transform infrared spectroscopy suggested that the MO_x-CeO₂ catalysts (M=Co and Fe) mainly followed an Eley-Rideal reaction mechanism for CO-SCR. In contrast, a Langmuir-Hinshelwood SCR reaction mechanism occurred in CuO-CeO₂ owing to the presence of Cu⁺ species, which ensured effective adsorption of CO. This explains why CuO-CeO₂ exhibited the highest activity with regard to the SCR of NO by CO.

Key words: Supercritical water, Nitrogen oxides, CO, Selective catalytic reduction, Diffuse reflectance Fourier transform infrared spectroscopy, CeO₂

Xiaoxia Dai, Weiyu Jiang, Wanglong Wang, Xiaole Weng, Yuan Shang, Yehui Xue, Zhongbiao Wu. Supercritical water syntheses of transition metal-doped CeO₂nano-catalysts for selective catalytic reduction of NO by CO: An in situ diffuse reflectance Fourier transform infrared spectroscopy study[J]. Chinese Journal of Catalysis, 2018, 39(4): 728-735.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(17)63008-0

https://www.cjcatal.com/EN/Y2018/V39/I4/728

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Supercritical water syntheses of transition metal-doped CeO₂nano-catalysts for selective catalytic reduction of NO by CO: An in situ diffuse reflectance Fourier transform infrared spectroscopy study

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