Research of pulse discharge plasma combined with Mn/TiO2-molecular、Fe/TiO2-molecular、Cu/TiO2-molecular sieve catalysts decomposition of formaldehyde

doi:10.16085/j.issn.1000-6613.2015.09.020

Chemical Industry and Engineering Progree ›› 2015, Vol. 34 ›› Issue (09): 3337-3344.DOI: 10.16085/j.issn.1000-6613.2015.09.020

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Research of pulse discharge plasma combined with Mn/TiO₂-molecular、Fe/TiO₂-molecular、Cu/TiO₂-molecular sieve catalysts decomposition of formaldehyde

DONG Bingyan^1,2, SHI Zhiyong¹, HE Junwen¹, WANG Hui¹, ZHOU Haijin¹, ZHANG Peng¹, NIE Yalin¹

1. Faulty of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China;
2. Key Laboratory of Environmental Pollution Control in Jiangxi Mining and Metallurgy, Ganzhou 341000, Jiangxi, China

Received:2014-12-04 Revised:2015-01-14 Online:2015-09-05 Published:2015-09-05

脉冲放电等离子体协同Mn/TiO₂-分子筛、Fe/TiO₂-分子筛、Cu/TiO₂-分子筛催化剂降解甲醛

董冰岩^1,2, 施志勇¹, 何俊文¹, 王晖¹, 周海金¹, 张鹏¹, 聂亚林¹

1. 江西理工大学资源与环境工程学院, 江西赣州 341000;
2. 江西省矿冶环境污染控制重点实验室, 江西赣州 341000

通讯作者: 施志勇,硕士研究生,从事脉冲放电低温等离子体在大气污染治理方面的研究及催化剂的制备研究。E-mail:775844740@qq.com
作者简介:董冰岩(1974-),男,博士,教授,硕士生导师,从事脉冲放电低温等离子体在环境保护方面的应用及工业安全防护技术研究。E-mail:dongbingyan1@sina.com
基金资助:
国家自然科学基金(51167007)及江西省教育厅资助项目(GJJ11455)。

Abstract

Abstract: In order to further improve formaldehyde removal efficiency,increase carbon dioxide selectivity,and decrease the generation concentration of ozone in pulse discharge plasma,a method of discharge plasma combined with catalysts was adopted in this research. Molecular sieve was used as carrier,then three catalysts were prepared,i.e. Mn/TiO₂-molecular sieve,Fe/TiO₂-molecular sieve and Cu/TiO₂-molecular sieve catalysts,which were characterized by XRD,SEM,EDS and FT-IR. Decomposition of formaldehyde in pulse discharge plasma combined with three catalysts was studied. Effects of plasma combined with different catalysts on formaldehyde removal efficiency,carbon dioxide selectivity and generation concentration of ozone were compared. The results showed that catalysts have synergistic effects on pulse discharge plasma. It could improve formaldehyde removal efficiency,increase carbon dioxide selectivity,and decrease generation concentration of ozone efficiently. Mn/TiO₂-molecular sieve catalyst has the best synergistic effect with the impulse voltage of 20kV,the frequency of 40Hz and the gas flow rate of 0.5L/min,i.e. its formaldehyde removal efficiency achieved 94.4% and carbon dioxide selectivity achieved 42.2%. Characterization results showed that Mn/TiO₂-molecular sieve catalyst uniform dispersion of active ingredients is as well as the existence of anatase TiO₂,and microcrystalline state MnO_x increased the oxidation of formaldehyde decomposition. Meanwhile,the mechanism of degrading formaldehyde in discharge plasma combined with Mn/TiO₂-molecular sieve catalyst was also discussed.

Key words: pulse discharge plasma, TiO₂-molecular sieve, catalyst, formaldehyde, synergistic effect

摘要： 为进一步提高脉冲放电等离子降解甲醛的效率,增加CO₂选择性,降低O₃产生量,研究采用放电等离子体和催化剂协同技术。实验以分子筛为载体,分别制备了Mn/TiO₂-分子筛、Fe/TiO₂-分子筛和Cu/TiO₂-分子筛3种催化剂,并利用XRD、SEM、EDS、FT-IR方法对催化剂进行表征分析。进行了脉冲放电等离子体协同3种催化剂降解甲醛的研究,比较了不同催化剂协同等离子体对甲醛去除率、CO₂选择性、O₃产生量的影响。结果表明,3种催化剂与脉冲放电等离子体都存在协同作用,并能有效地提高甲醛去除率,增加CO₂选择性,降低O₃产生量。当脉冲电压为20kV、放电频率为40Hz、气体流量为0.5L/min时,Mn/TiO₂-分子筛催化剂协同效果最佳,甲醛去除率为94.4%,CO₂选择性为42.2%。催化剂表征结果显示Mn/TiO₂-分子筛的活性组分颗粒分布均匀,锐钛矿相的TiO₂和微晶状态的MnO_x的存在有效促进了甲醛的氧化分解。研究还对放电等离子体协同Mn/TiO₂-分子筛催化剂降解甲醛的机理进行了探讨。

关键词: 脉冲放电等离子体, TiO₂-分子筛, 催化剂, 甲醛, 协同作用

CLC Number:

X511

DONG Bingyan, SHI Zhiyong, HE Junwen, WANG Hui, ZHOU Haijin, ZHANG Peng, NIE Yalin. Research of pulse discharge plasma combined with Mn/TiO₂-molecular、Fe/TiO₂-molecular、Cu/TiO₂-molecular sieve catalysts decomposition of formaldehyde[J]. Chemical Industry and Engineering Progree, 2015, 34(09): 3337-3344.

董冰岩, 施志勇, 何俊文, 王晖, 周海金, 张鹏, 聂亚林. 脉冲放电等离子体协同Mn/TiO₂-分子筛、Fe/TiO₂-分子筛、Cu/TiO₂-分子筛催化剂降解甲醛[J]. 化工进展, 2015, 34(09): 3337-3344.

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Research of pulse discharge plasma combined with Mn/TiO₂-molecular、Fe/TiO₂-molecular、Cu/TiO₂-molecular sieve catalysts decomposition of formaldehyde

脉冲放电等离子体协同Mn/TiO₂-分子筛、Fe/TiO₂-分子筛、Cu/TiO₂-分子筛催化剂降解甲醛

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