Experimental Study on SCR-C3H6 Over Cu–Fe/Al-PILC Catalysts: Catalytic Performance, Characterization, and Mechanism

作者：Yaxin Su, Nini Wen, Jianghao Cheng, Wenyi Deng, Hao Zhou, Bingtao Zhao · 发表于：Industrial & Engineering Chemistry Research · 年份：2020 · DOI：10.1021/acs.iecr.0c02798 · 被引用次数：26 · 研究领域：Catalytic Processes in Materials Science、Nanomaterials for catalytic reactions、Phosphorus and nutrient management

The selective catalytic reduction of NO with hydrocarbons (SCR-HC) is currently one of the promising technologies for the control of nitrogen oxides (NO x ). Iron-based catalysts are very promising for the SCR-HC reaction considering both the NO conversion efficiency and low cost as an environmentally friendly metal. However, these Fe-based catalysts showed poor SCR activity below 300 °C. To improve the reactivity of the iron-based catalysts supported on Alumina-pillared clays at lower temperatures, Cu was used to modify the Fe/Al-pillared interlayered clay (PILC) catalysts and the selective catalytic reduction of NO with C 3 H 6 (SCR-C 3 H 6 ) was investigated at 150–550 °C over x Cu–Fe/Al-PILC catalysts ( x = 0.11–0.38, x means the molar ratio of Cu/Fe) prepared by the impregnation method. The catalysts were characterized by means of X-ray diffraction (XRD), N 2 adsorption–desorption, H 2 -temperature-programmed reduction (TPR), ultraviolet–visible spectroscopy (UV–vis), X-ray photoelectron spectroscopy (XPS), pyridine-adsorption infrared spectroscopy (Py-FTIR), etc. The results showed that Cu improved the SCR of NO obviously at lower temperatures, e.g., the NO conversion increased from 5 to 44% at 150 °C and from 15 to 93% at 250 °C, respectively, for the original Fe/Al-PILC catalysts and the 0.13Cu–Fe/Al-PILC catalyst. The interaction of copper and iron promoted the dispersion of iron species on the catalyst surface and improved the reduction ability of the iron species a...