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首页> 外文期刊>Environmental Science & Technology >Alkali Potassium Induced HCl/CO_2 Selectivity Enhancement and Chlorination Reaction Inhibition for Catalytic Oxidation of Chloroaromatics
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Alkali Potassium Induced HCl/CO_2 Selectivity Enhancement and Chlorination Reaction Inhibition for Catalytic Oxidation of Chloroaromatics

机译：碱钾诱导的HCl / CO_2选择性增强和氯代芳烃催化氧化的氯化反应抑制

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摘要

Industrial combustion of chloroaromatics is likely to generate unintentional biphenyls (PCBs), polychlorinated dibenzo-p -dioxins (PCDDs), and polychlorinated dibenzofurans (PCDFs). This process involves a surface-mediated reaction and can be accelerated in the presence of a catalyst. In the past decade, the effect of surface nature of applied catalysts on the conversion of chloroaromatics to PCBs/PCDD/PCDF has been well explored. However, studies on how the flue gas interferent components affect such a conversion process remain insufficient. In this article, a critical flue gas interferent component, alkali potassium, was investigated to reveal its effect on the chloroaromatics oxidation at a typical solid acid–base catalyst, Mn_(x )Ce_(1–x )O_(2)/HZSM-5. The loading of alkali potassium was found to improve the Lewis acidity of the catalyst (by increasing the amounts of surface Mn~(4+) after calcination), which thus promoted the CO_(2) selectivity for catalytic chlorobenzene (CB) oxidation. The KOH with a high hydrophilicity has favored the adsorption/activation of H_(2)O molecules that provided sufficient hydroxyl groups and possibly induced a hydrolysis process to promote the formation of HCl. The K ion also served as a potential sink for chorine ions immobilization (via forming KCl). Both of these inhibited the formation of phenyl polychloride byproducts, thereby blocking the conversion of CB to chlorophenol and then PCDDs/PCDFs, and potentially ensuring a durable operation and less secondary pollution for the catalytic chloroaromatics combustion in industry.
机译：氯代芳烃的工业燃烧很可能会产生意外的联苯（PCBs），多氯代二苯并对二恶英（PCDDs）和多氯代二苯并呋喃（PCDFs）。该过程涉及表面介导的反应，并且可以在催化剂的存在下加速。在过去的十年中，已经很好地探索了所施加催化剂的表面性质对氯代芳烃向PCBs / PCDD / PCDF转化的影响。然而，关于烟气干扰成分如何影响这种转化过程的研究仍然不足。在本文中，研究了一种关键的烟气干扰组分碱金属钾，以揭示其对典型的固体酸碱催化剂Mn _（）Ce_（1-x）上的氯代芳烃氧化的影响。 （2）/ HZSM-5。发现碱钾的负载改善了催化剂的路易斯酸度（通过增加煅烧后表面Mn〜（4+）的量），从而提高了催化氯苯（CB）氧化的CO_（2）选择性。具有高亲水性的KOH有利于H_（2）O分子的吸附/活化，H_（2）O分子提供了足够的羟基，并可能诱导了水解过程以促进HCl的形成。钾离子还可以作为固定氯离子的潜在通道（通过形成氯化钾）。两者均抑制了苯基多氯化物副产物的形成，从而阻止了CB向氯苯酚和PCDDs / PCDFs的转化，并有可能确保工业上催化性氯代芳烃燃烧的持久运行和较少的二次污染。

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  • 来源
    《Environmental Science & Technology》 |2018年第11期|6438-6447|共10页
  • 作者

    Pengfei Sun; Wanglong Wang; Xiaole Weng; Xiaoxia Dai; Zhongbiao Wu;

  • 作者单位

    Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental and Resource Sciences, Zhejiang University, 310058 Hangzhou, P. R. China;

    Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental and Resource Sciences, Zhejiang University, 310058 Hangzhou, P. R. China;

    Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental and Resource Sciences, Zhejiang University, 310058 Hangzhou, P. R. China,Zhejiang Provincial Engineering Research Centre of Industrial Boiler & Furnace Flue Gas Pollution Control, 388 Yuhangtang Road, 310058 Hangzhou, P. R. China;

    Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental and Resource Sciences, Zhejiang University, 310058 Hangzhou, P. R. China;

    Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental and Resource Sciences, Zhejiang University, 310058 Hangzhou, P. R. China,Zhejiang Provincial Engineering Research Centre of Industrial Boiler & Furnace Flue Gas Pollution Control, 388 Yuhangtang Road, 310058 Hangzhou, P. R. China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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