催化作用
化学
乙腈
矿化(土壤科学)
ZSM-5型
水解
分解
无机化学
选择性
氮氧化物
沸石
铂金
氮气
有机化学
燃烧
作者
Yaoyu Zhang,Yu-Xiong Wang,Yue Liu,Huimin Xu,Zhongbiao Wu
标识
DOI:10.1016/j.cej.2023.142343
摘要
Pt@Cu-ZSM-5@CuOx catalyst was constructed for the catalytic oxidation of acetonitrile (AN), which achieved a complete mineralization rate and more than 95 % N2 selectivity within 300–450 °C. Characterization results revealed that the satisfactory synergistic action of hydrolysis and oxidation pathways was well achieved. The NOx release from CN oxidation reaction on out-layer CuOx species and NHx species over-oxidation over Pt sites could be eliminated by NH3 from CN hydrolysis reaction on Cu ions via internal selective catalytic reduction mechanism. The deep oxidation of carbon-containing intermediates (such as CO etc.) during CN decomposition over Cu species effectively occurred over Pt site. The encapsulation of Pt inner ZSM-5 zeolite not only strengthened low-temperature mineralization rate compared to Cu/ZSM-5 sample, but also inhibited NOx release caused by over-oxidation of AN at an elevated temperature with co-impregnation of Pt species over Cu/ZSM-5. This work provided a viable strategy for designing catalysts to effective abatement of NVOCs.
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