Reactivity of Ni-modified MIL-100(Fe) catalysts for C3H6-SCR and reaction mechanism.

Metal-organic frameworks (MOFs)-based carrier, MIL-100(Fe), was synthesized by hydrothermal method and Ni was supported on the MIL-100(Fe) by wet impregnation method to prepare the catalysts for selective catalytic reduction of NO with C 3 H 6 (C 3 H 6 -SCR). The addition of Ni significantly improved the reactivity of C 3 H 6 -SCR. At 275 °C, the NO conversion of MIL-100(Fe) was 74.5%, whereas the NO conversion of 5.8%Ni/MIL-100(Fe) with 100% N 2 selectivity was 100%. The in-situ DRIFTS prove that the interaction between NO 2 −/NO 3 − and C x H y O z substances generated intermediate isocyanates (R-NCO), and the reaction pathway was proposed based on the DRIFTS results to understand the mechanism. [Display omitted] • Ni-modified MIL-100(Fe) was successfully prepared by the wet impregnation method. • 5.8%Ni/MIL-100(Fe) was used for the C 3 H 6 -SCR reaction. • 5.8% Ni/MIL-100 (Fe) exhibited a 100% NO x conversion and 100% N 2 selectivity at 275 °C. • A possible mechanism was proposed based on the In-situ DRIFTS results. • Ni-NCO and Fe-NCO species facilitate the C 3 H 6 -SCR reaction. [ABSTRACT FROM AUTHOR]