Abstract

A catalyst with sufficient catalytic performance at low temperature and excess oxygen is desired for C3H6-SCR. Layered double hydroxides (LDHs) are a kind of layered minerals with great application potential, due to their diverse chemical composition and flexible structure. After the heat treatment, LDHs can provide a nano-polymetallic catalyst for C3H6-SCR, with small particle size, good thermal stability, and homogenous dispersion of metal cations. In this contribution, the C3H6-SCR under excess oxygen was investigated over a series of CuxFey-600c catalysts, derived from CuxFey-LDHs precursors synthesized by the coprecipitation method. These samples were characterized by various techniques, namely, FTIR, SEM, XRD, H2-TPR, XPS, Py-FTIR, and In situ DRIFTS. The results indicated that CuxFey-600c catalysts showed superior C3H6-SCR performance than single metal catalysts (CuO, Fe2O3), as a result of the synergistic effect between Cu and Fe. This synergistic effect between Cu and Fe can promote the formation of CuFe2O4 active phase and redox ability of catalysts. Among all catalysts, Cu0.71Fe0.29-600c exhibited the maximum NO conversion of 60% at 300 °C, owing to the strongest synergistic effect, more lattice oxygen, and stronger Brønsted acidity. On the basis of static and dynamic in situ DRIFTS experiments, a possible reaction pathway of C3H6-SCR was proposed.

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