Selective Catalytic Reduction of NOx by Methanol on Metal-Free Zeolite with Brønsted and Lewis Acid Pair

• DOI: 10.1021/acscatal.1c05624
• Publication Date: 2022-02-01T23:13:56Z
• Authors: Fei Han; Han Sun; Zhenchao Zhao; Yaxin Xu; Hong Dong; Weiwei Liu; Lu Sun; Zhili Wang; Guangjin Hou; Masaaki Kitano; Wei Li; Meiqing Shen; Haijun Chen
• Keywords: Selective catalytic reduction; Brønsted–Lowry acid–base theory; Selective Reduction

The selective catalytic reduction deNOx technology by ammonia (NH3-SCR) on vanadium-based catalysts is now being used worldwide for industrial exhaust treatment, while the disposal of spent faces a high level environmental risk posed poisonous vanadium. We present here an environmentally friendly method with pure H-FER zeolite as catalyst using methanol reductant instead NH3 (CH3OH-SCR). This metal-free Brønsted and Lewis acid pairs shows almost 4 times higher activity than most investigated precious metal (Ag/Al2O3). Furthermore, it comparable efficiency state-of-the-art NH3-SCR catalysts, well good stability potential application. Operando Fourier transform infrared (FT-IR), in situ NMR, theoretical calculations demonstrated that solid species are highly active CH3OH-SCR reaction. A reaction mechanism based synergistic effect between Si–O(H)–Al sites neighboring extra-framework aluminum (EFAL) has been proposed.