无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2023, Vol. 55 ›› Issue (9): 126-133.doi: 10.19964/j.issn.1006-4990.2022-0750

• 催化材料 • 上一篇    下一篇

不同禁带宽度催化剂协同低温等离子体氧化NO x

郭子妮(), 屈吉艳, 罗建洪()   

  1. 四川大学化学工程学院,四川成都 610065
  • 收稿日期:2022-12-22 出版日期:2023-09-10 发布日期:2023-09-19
  • 通讯作者: 罗建洪(1979— ),男,博士,教授,研究方向为光催化处理有机废水技术开发等;E-mail:luojianhong@scu.edu.cn
  • 作者简介:郭子妮(1997— ),女,硕士,研究方向为等离子体催化氧化降解氮氧化物;E-mail:guozn97@ 163.com
  • 基金资助:
    国家重点研发计划项目(2018YFC1900203-03);四川省科技计划项目(2021YF0285)

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

GUO Zini(), QU Jiyan, LUO Jianhong()   

  1. School of Chemical Engineering,Sichuan University,Chengdu 610065,China
  • Received:2022-12-22 Published:2023-09-10 Online:2023-09-19

摘要:

由于催化剂协同低温等离子体法脱除氮氧化物效果显著,通过研究制备了WO3、ZnO、NiO、CdS和Cu2O共5种禁带宽度不同的催化剂,通过SEM、XRD、Raman等表征方式,对比了与低温等离子体联合催化氧化NO与NO x 的性能。实验得出:P型半导体对NO x 去除效果较差,N型半导体对NO x 的去除具有明显效果;氧化效率由大到小依次为CdS、WO3、ZnO,这与其禁带宽度值正好相反;CdS对NO、NO x 的氧化效率分别为98.4%、84.4%,并且CdS循环再利用的催化性能效果依旧。阐明了等离子体和催化剂对反应过程的具体影响和二者之间的耦合作用。经过放电催化后的样品,借助离子色谱测定其表面的NO3-与NO2-,有利于深入了解此类协同机制。

关键词: 等离子体, 催化剂, NO x, 禁带宽度

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

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