化工进展 ›› 2022, Vol. 41 ›› Issue (11): 5830-5842.DOI: 10.16085/j.issn.1000-6613.2022-0089

• 工业催化 • 上一篇    下一篇

响应面法优化Mn-Ce/HZSM-5催化氧化三氯乙烯

常甜1,2,3,4(), 王宇1, 赵作桐1, 胡锦超1, 沈振兴2()   

  1. 1.陕西科技大学环境科学与工程学院,陕西 西安 710021
    2.西安交通大学能源与动力工程学院,陕西 西安 710049
    3.省部共建煤炭高效利用与绿色化工国家重点实验室(宁夏大学),宁夏 银川 750021
    4.中国科学院地球环境研究所黄土与第四纪地质国家重点实验室,陕西 西安 710049
  • 收稿日期:2022-01-12 修回日期:2022-05-20 出版日期:2022-11-25 发布日期:2022-11-28
  • 通讯作者: 沈振兴
  • 作者简介:常甜(1988—),女,副教授,硕士生导师,研究方向为大气挥发性有机物监测与控制。E-mail:changtian@sust.edu.cn
  • 基金资助:
    省部共建煤炭高效利用与绿色化工国家重点实验室开放课题(2022-K45);中国科学院地球环境研究所黄土与第四纪地质国家重点实验室开放课题(SKLLQG2129);陕西省自然科学基础研究计划(2022JQ-101)

Optimization of catalytic oxidation of trichloroethylene over Mn-Ce/HZSM-5 using response surface methodology

CHANG Tian1,2,3,4(), WANG Yu1, ZHAO Zuotong1, HU Jinchao1, SHEN Zhenxing2()   

  1. 1.School of Environmental Science and Engineering, Shaanxi University of Science & Technology, Xi’an 710021, Shaanxi, China
    2.School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, China
    3.State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, Ningxia, China
    4.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, CAS, Xi’an 710049, Shaanxi, China
  • Received:2022-01-12 Revised:2022-05-20 Online:2022-11-25 Published:2022-11-28
  • Contact: SHEN Zhenxing

摘要:

三氯乙烯(TCE)是用途广泛的工业原料,其排放严重威胁着生态环境和人体健康。如何高效去除TCE成为亟待解决的关键问题。本文采用沉积-沉淀法制备了一系列不同Ce/Mn摩尔比的Mn-Ce/HZSM-5催化剂,用于催化去除TCE,并用响应面分析的方法探究不同因素对TCE催化氧化过程的影响。结果表明:Mn-Ce/HZSM-5催化剂对TCE有较好的催化活性,当Ce/Mn摩尔比为0.8时催化活性最高,主要归因于该催化剂较高的还原性和丰富的表面氧物种。另外,响应面分析结果表明:在MnCe0.8/HZSM-5催化氧化TCE过程中,温度是影响TCE去除率和CO2选择性的最关键因素,其次是流量和相对湿度(RH)。当气体流量为0.2L/min、温度为450℃、RH为16%时,最优TCE去除率为77.1%,CO2选择性为70.0%,且MnCe0.8/HZSM-5催化剂表现出较好的稳定性。研究结果为含氯挥发性有机物的去除提供了一种有效方法。

关键词: Mn-Ce/HZSM-5催化剂, 三氯乙烯, 活性, 响应面法, 优化

Abstract:

Trichloroethylene (TCE) is a widely used industrial raw material, but its emission seriously threatens the ecological environment and human health. How to efficiently remove TCE is still a crucial issue to be solved urgently. In this study, a series of Mn-Ce/HZSM-5 catalysts with different molar ratios of Ce/Mn were prepared by a deposition-precipitation method, and then used for the catalytic oxidation of TCE. The effects of various process parameters on the catalytic performance of the TCE decomposition were investigated using response surface methodology (RSM). The Mn-Ce/HZSM-5 catalyst demonstrated good catalytic activity for TCE decomposition, and MnCe0.8/HZSM-5 catalyst exhibited the highest catalytic activity due to its high reducibility and abundant surface oxygen species. In addition, the RSM analysis results showed that temperature was the most significant factor affecting the TCE removal efficiency and CO2 selectivity, followed by the gas flow rate and relative humidity (RH) in catalytic oxidation of TCE by MnCe0.8/HZSM-5. The best TCE removal efficiency (77.1%) and CO2 selectivity (70.0%) were acquired at a gas flow rate of 0.2L/min, temperature of 450℃ and RH of 16%. Moreover, the MnCe0.8/HZSM-5 catalyst also showed good stability. The results provided an effective method for the removal of chlorinated volatile organic compounds.

Key words: Mn-Ce/HZSM-5 catalyst, trichloroethylene, reactivity, response surface methodology, optimization

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