Synergistic removal of acetone and NOx by Ag modified Mn/ HZSM-5 catalyst

被引：0

作者：

Sun, Changcheng ^{[1
,2
]}

Ye, Lyumeng ^{[2
]}

Lu, Peng ^{[2
]}

Yan, Xianhui ^{[2
]}

Huang, Jianhang ^{[2
]}

Tang, Zhixiong ^{[2
]}

Chen, Dongyao ^{[2
]}

Cen, Chaoping ^{[2
]}

机构：

[1] Chinese Res Inst Environm Sci, Beijing 100012, Peoples R China

[2] MEE, South China Inst Environm Sci, Guangdong Prov Engn Lab Air Pollut Control, Guangdong Prov Key Lab Water & Air Pollut Control, Guangzhou 510655, Peoples R China

来源：

CHEMICAL ENGINEERING JOURNAL | 2025年 / 505卷

关键词：

Acetone oxidation; NH3-SCR; MnAg/HZSM-5; catalyst; Synergistic control; SCR CATALYST; OXIDATION; CHLOROBENZENE; FORMALDEHYDE; PERFORMANCE; REDUCTION; MECHANISM; SUPPORT;

D O I：

10.1016/j.cej.2025.159622

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The key point to broaden the operating temperature window for synergistic control of NOx and oxygenated volatile organic compounds (OVOCs) with high NOx/VOCs conversion and N2/CO2 selectivity relies on development of appropriate catalysts. Herein, a silver-modified Mn/HZSM-5 catalyst was designed, which achieved an effective NOx and acetone co-removal activity and maintained over 90 % N2/CO2 selectivity at a broad temperature range from 293 to 400 degrees C. The excellent performance of MnAg/HZSM-5 was due to large surface area, plenty of oxygen vacancies and Lewis acid sites, as well as outstanding oxygen mobility and reducibility that derived from the interactions between Mn4+/Mn3+ and Ag+/Ag0. NOx reduction followed both Eley-Rideal and Langmuir-Hinshelwood mechanisms, while acetone hardly replaced NH3 as a reduction agent. Acetone oxidation underwent acetone -> acetate -> formate -> carbonate -> CO2 and H2O following a Mars-van Krevelen mechanism. NH3 participated in acetone oxidation, forming amide and nitrile species, which caused catalyst deactivation and secondary pollution.

引用

页数：12

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