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Rapid Ultrasound‐Assisted Synthesis of Mesoporous Manganese Oxides for Low‐Concentration NO Elimination with Superior Water‐Resistance
Author(s) -
Du Yanyan,
He Feng,
Hua Zile,
Wu Zhijian,
Li Mengli,
Li Jiusheng,
Huang Keke,
Shi Jianlin
Publication year - 2017
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201700008
Subject(s) - chemistry , manganese , catalysis , mesoporous material , chemisorption , adsorption , redox , nitric acid , inorganic chemistry , relative humidity , ion , nuclear chemistry , organic chemistry , physics , thermodynamics
Through a room‐temperature ultrasound‐assisted redox process, mesoporous manganese oxides were synthesized in short reaction times of 3–9 h. At room temperature, the resultant materials showed superior performance for the elimination of low‐concentration NO (10 ppm). Specifically, under humid conditions (50–90 % relative humidity), 97 % NO removal efficiency was obtained over 110 h without deactivation. Synergetic effects between Mn 2+ , Mn 3+ , and Mn 4+ ions were proposed to explain the oxidation of NO to NO 2 on the surface of the catalyst. Density functional theory (DFT) calculations indicated that water molecules strengthen the chemisorption of NO 2 on manganese oxide (001) owing to a much higher adsorption energy. As a result, the probability of the reaction between NO 2 and H 2 O increases, and the formation of volatile nitric acid ensures that the catalytically active sites are always available.