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首页> 外文期刊>Catalysis science & technology >Removal mechanism and quantitative control of trichloroethylene in a post-plasma-catalytic system over Mn-Ce/HZSM-5 catalysts
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Removal mechanism and quantitative control of trichloroethylene in a post-plasma-catalytic system over Mn-Ce/HZSM-5 catalysts

机译：去除机理和定量控制三氯乙烯在post-plasma-catalytic系统通过Mn-Ce / HZSM-5催化剂

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摘要

It is urgent to control trichloroethylene (TCE) due to its harmful effect on the environment and humans. Here, a post-plasma-catalytic (PPC) system combining Mn-Ce/HZSM-5 catalysts and a corona discharge reactor was developed for TCE degradation. Among the tested catalysts, MnCe1/HZSM-5 (Ce/Mn molar ratio = 1) showed the best catalytic performance due to its better reducibility and higher content of adsorbed oxygen. The PPC configuration markedly lowered the activation temperature of the catalyst. Then, the optimization of the TCE degradation process in the PPC system was performed using response surface methodology. The results showed that the discharge power was the dominant factor affecting the TCE degradation process, followed by the gas flow rate and relative humidity (RH). The optimum TCE removal efficiency of 99.9%, CO2 yield of 52.84% and CO yield of 22.74% were obtained under the following operating conditions: discharge power 1.13 W, gas flow rate 0.5 L min(-1) and RH 18.77%. The stability of the PPC system over the MnCe1/HZSM-5 catalyst was successfully evaluated by a long-time test. Finally, the TCE degradation pathway in the PPC system was also proposed. This study strengthens the understanding of the TCE decomposition mechanism and paves a way for quantitative control of TCE in the PPC system.
机译：迫在眉睫的是控制三氯乙烯(TCE)由于其对环境和有害的影响人类。系统结合Mn-Ce / HZSM-5和催化剂电晕放电反应器对TCE发达退化。MnCe1 / HZSM-5 (Ce /锰的摩尔比率= 1)显示最好的催化性能最好还原性和较高含量的吸附氧气。催化剂的活化温度。TCE降解的优化过程PPC系统都使用响应表面的方法。放电功率是主要影响因素TCE降解过程,其次是气体流量和相对湿度(RH)。TCE去除效率为99.9%,二氧化碳产生的52.84%,公司得到了收益率为22.74%以下操作条件:放电功率1.13 W,气体流速0.5 L min(1)和RH18.77%。MnCe1 / HZSM-5催化剂成功评估通过长期的考验。通路在PPC系统也提出了。研究加强对TCE的理解分解机制和铺平道路的一种方式定量控制TCE的PPC系统。

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