不同禁带宽度催化剂协同低温等离子体氧化NO x

doi:10.19964/j.issn.1006-4990.2022-0750

Abstract

Abstract:

The removal of nitrogen oxides by catalyst and low-temperature plasma is remarkable.Five catalysts with different band gaps，such as WO₃，ZnO，NiO，CdS and Cu₂O，were prepared.By means of SEM，XRD and Raman characterization，the catalytic oxidation performance of NO and NO _x combined with low temperature plasma was compared.P-type semiconductors had no effect on NO _x removal，while N-type semiconductors had obvious effect on NO _x removal.The order of oxidation efficiency from big to small was CdS，WO₃，ZnO，which was exactly opposite to their band gap values.The degradation efficiency of NO and NO _x by CdS was 98.4% and 84.4% respectively，and the catalytic performance of CdS recycling was still good.The specific effects of plasma and catalyst on the reaction process and the coupling between them were described.The determination of NO₃^- and NO₂^- on the surface of samples catalyzed by discharge by ion chromatography was conducive to further understanding of such synergistic mechanism.

Key words: plasma, catalyst, NO _x, band gap

CLC Number:

TQ126.23

GUO Zini, QU Jiyan, LUO Jianhong. Oxidation of NO _x by low-temperature plasma using catalysts with different band gaps[J]. Inorganic Chemicals Industry, 2023, 55(9): 126-133.

Figures/Tables 11

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References 18

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Oxidation of NO _x by low-temperature plasma using catalysts with different band gaps

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Oxidation of NO x by low-temperature plasma using catalysts with different band gaps