Removal of toluene using non-thermal plasma coupled with Mn-Ce/La/γ-Al2O3 catalysts

doi:10.11949/j.issn.0438-1157.20161656

Abstract

Abstract:

The removal of low concentrations of toluene using non-thermal plasma (NTP) coupled with Mn-Ce/La/γ-Al₂O₃catalysts was investigated in this study. Mn/γ-Al₂O₃ catalyst, Mn-Ce/γ-Al₂O₃catalyst and Mn-La/γ-Al₂O₃catalyst were prepared for the experiment. The removal efficiency of toluene, generation of O₃, CO_x selectivity for different reactors were studied. The catalysts were characterized by BET, SEM, H₂-TPR and ICP-OES. The results showed that the rare earth catalysts could effectively improve the removal efficiency of toluene and the degree of mineralization. Mn-La/γ-Al₂O₃had the better catalytic performance than Mn-Ce/γ-Al₂O_3.The removal efficiency of toluene for the Mn-La/γ-Al₂O₃catalyst was 72.74% under the initial concentration of toluene of 600 mg·m^-3, discharge voltage of 22 kV and gas flow rate of 6 L·min^-1. Moreover, H₂-TPR results indicated that the low-temperature activity and capability of O₃ adsorption enhanced with the loading of rare earth catalysts. The catalysts were contributed to the decomposition of O₃and the enhancement of selectivity of CO₂ and CO_x.

Key words: non-thermal plasma, toluene, Mn-Ce/La/γ-Al₂O₃, ozone, CO_x

摘要：

采用自制线管式介质阻挡放电反应器，针对非热等离子体协同Mn-Ce/La/γ-Al₂O₃催化剂对低浓度甲苯的去除开展研究。研究中制备了Mn/γ-Al₂O₃、Mn-Ce/γ-Al₂O₃、Mn-La/γ-Al₂O₃催化剂，从甲苯去除率、产物O₃生成、CO_x选择性及其他副产物生成情况考察比较了空管放电、协同催化剂放电时催化降解甲苯性能，并对催化剂进行了BET、SEM、H₂-TPR和ICP-OES表征研究。结果表明：稀土助剂的加入有助于提高甲苯去除率及降低程度，且La催化性能优于Ce_.，当外加电压22 kV、气量6 L·min^-1、甲苯初始浓度600 mg·m^-3时，Mn-La/γ-Al₂O₃催化剂对甲苯去除率达到72.74%。H₂-TPR结果表明，稀土助剂的加入提高了催化剂低温活性及储氧能力，添加La的效果优于Ce。催化剂有助于抑制副产物O₃生成，提高CO₂和CO_x选择性。

关键词: 非热等离子体, 甲苯, Mn-Ce/La/γ-Al₂O₃, 臭氧, CO_x

CLC Number:

X511

LIANG Wenjun, GUO Shuqing, WU Hongmei, LI Jian, HE Hong. Removal of toluene using non-thermal plasma coupled with Mn-Ce/La/γ-Al₂O₃catalysts[J]. CIESC Journal, 2017, 68(7): 2755-2762.

梁文俊, 郭书清, 武红梅, 李坚, 何洪. 非热等离子体协同Mn-Ce/La/γ-Al₂O₃催化剂去除甲苯[J]. 化工学报, 2017, 68(7): 2755-2762.

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Removal of toluene using non-thermal plasma coupled with Mn-Ce/La/γ-Al₂O₃catalysts

非热等离子体协同Mn-Ce/La/γ-Al₂O₃催化剂去除甲苯

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