AgMn/HZSM-5催化剂上室温O3氧化脱除空气中的苯:Mn含量和水含量的影响

考察了Mn含量和水含量对AgMn/HZSM-5(AgMn/HZ)催化剂上室温O3氧化(OZCO)脱除空气中苯的影响.研究发现, Mn含量为2.4 wt%的AgMn/HZ催化剂(AgMn/HZ(2.4))具有大的比表面积和高的MnOx分散度, OZCO活性和稳定性最高.反应后的程序升温脱附结果表明,2.4 wt%的Mn含量能有效抑制苯和甲酸在催化剂上的残留.当Mn含量≤2.4 wt%时,催化剂分解O3的活性在苯氧化过程中占主导;当Mn含量>2.4 wt%时,苯的活化起主要作用.基于AgMn/HZ(2.4)催化剂优越的反应活性和稳定性,进一步研究了湿气流中该催化剂上苯的氧化.与干气流相比,水...

Full description

Saved in:
Bibliographic Details
Published in催化学报 Vol. 35; no. 9; pp. 1465 - 1474
Main Author 刘阳 李小松 刘景林 石川 朱爱民
Format Journal Article
LanguageChinese
Published 大连理工大学等离子体物理化学实验室,辽宁大连,116024 2014
Subjects
Online AccessGet full text
ISSN0253-9837
1872-2067
DOI10.1016/S1872-2067(14)60070-X

Cover

More Information
Summary:考察了Mn含量和水含量对AgMn/HZSM-5(AgMn/HZ)催化剂上室温O3氧化(OZCO)脱除空气中苯的影响.研究发现, Mn含量为2.4 wt%的AgMn/HZ催化剂(AgMn/HZ(2.4))具有大的比表面积和高的MnOx分散度, OZCO活性和稳定性最高.反应后的程序升温脱附结果表明,2.4 wt%的Mn含量能有效抑制苯和甲酸在催化剂上的残留.当Mn含量≤2.4 wt%时,催化剂分解O3的活性在苯氧化过程中占主导;当Mn含量>2.4 wt%时,苯的活化起主要作用.基于AgMn/HZ(2.4)催化剂优越的反应活性和稳定性,进一步研究了湿气流中该催化剂上苯的氧化.与干气流相比,水汽的加入能显著提高催化剂的反应活性和稳定性,且以0.1-0.2 vol%水含量时最优.
Bibliography:Yang Liu, Xiaosong Li, Jinglin Liu, Chuan Shi, Aimin Zhu (Laboratory of Plasma Physical Chemistry, Dalian University of Technology, Dalian 116024, Liaoning, China)
The effects of Mn loading and water content on AgMn/HZSM-5 (AgMn/HZ) catalysts were investi-gated in the ozone catalytic oxidation (OZCO) of benzene in a continuous air flow at room tempera-ture. The catalytic activity is closely related to the Mn loading, and the AgMn/HZ catalyst with 2.4 wt%Mn (AgMn/HZ(2.4)) had the highest activity and stability in benzene oxidation as a result of its large surface area and high MnOx dispersion. Temperature-programmed desorption of the used catalysts demonstrated that 2.4 wt%was also the optimal Mn loading for suppressing the accumu-lation of benzene and HCOOH over the catalyst surface after benzene oxidation. For AgMn/HZ cata-lysts with Mn loadings≤2.4 wt%, O3 decomposition to active oxygen species (O*) plays the most important role in benzene oxidation;however, benzene activation is the crucial step for benzene
ISSN:0253-9837
1872-2067
DOI:10.1016/S1872-2067(14)60070-X