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Adsorption of HCl on Calcined Ca and Zn Hydrotalcite-like Compounds (HTLs) at Medium-High Temperature in Flue Gas
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-12-20 , DOI: 10.1021/acs.iecr.8b03092 Jun Cao 1 , Tianyu Chen 1 , Baosheng Jin 1 , Yaji Huang 1 , Chunhong Hu 1
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-12-20 , DOI: 10.1021/acs.iecr.8b03092 Jun Cao 1 , Tianyu Chen 1 , Baosheng Jin 1 , Yaji Huang 1 , Chunhong Hu 1
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The high level of HCl generated from municipal solid-waste incinerators at 350–650 °C is considered a primary chlorine source for emitted toxic polychlorinated dibenzodioxins and polychlorinated dibenzofurans. Herein, calcium (Ca) and zinc (Zn) hydrotalcite-like compounds (HTLs) were prepared to remove HCl at different reaction temperatures and initial HCl concentrations. The mechanism of the adsorption of HCl by the HTLs and calcined HTLs (HTOs) was investigated using thermogravimetric analysis, X-ray powder diffraction, scanning electron microscopy, and surface-area measurements. The Ca- and Zn-HTLs had similar structures and physicochemical properties. Both sorbents had good adsorption capacities for HCl that exceeded 90% over 456 min at 550 °C in an HCl concentration of 750 mg/g. The adsorption capacity of Zn-HTOs was better than that of Ca-HTOs at 350 °C. The removal efficiency of Ca-HTLs was higher than that of Zn-HTLs at temperatures above 550 °C. The Freundlich isotherm provided a good fit to the experimental data for the HTLs.
中文翻译：
烟气中高温下煅烧的钙和锌水滑石样化合物（HTL）上的HCl吸附。
在350–650°C的温度下，市政固体废物焚烧炉产生的高浓度HCl被认为是排放有毒多氯二苯并二恶英和多氯二苯并呋喃的主要氯源。在此，制备钙（Ca）和锌（Zn）类水滑石化合物（HTL）以去除在不同反应温度和初始HCl浓度下的HCl。使用热重分析，X射线粉末衍射，扫描电子显微镜和表面积测量研究了HTL和煅烧HTL（HTO）吸附HCl的机理。Ca和Zn-HTL具有相似的结构和理化性质。两种吸附剂均具有良好的HCl吸附能力，在550°C的750 mg / g的HCl中，在456分钟内超过了90％。在350°C时，Zn-HTOs的吸附能力优于Ca-HTOs。在高于550°C的温度下，Ca-HTL的去除效率高于Zn-HTL。Freundlich等温线非常适合HTL的实验数据。
更新日期：2018-12-20
中文翻译：
烟气中高温下煅烧的钙和锌水滑石样化合物（HTL）上的HCl吸附。
在350–650°C的温度下，市政固体废物焚烧炉产生的高浓度HCl被认为是排放有毒多氯二苯并二恶英和多氯二苯并呋喃的主要氯源。在此，制备钙（Ca）和锌（Zn）类水滑石化合物（HTL）以去除在不同反应温度和初始HCl浓度下的HCl。使用热重分析，X射线粉末衍射，扫描电子显微镜和表面积测量研究了HTL和煅烧HTL（HTO）吸附HCl的机理。Ca和Zn-HTL具有相似的结构和理化性质。两种吸附剂均具有良好的HCl吸附能力，在550°C的750 mg / g的HCl中，在456分钟内超过了90％。在350°C时，Zn-HTOs的吸附能力优于Ca-HTOs。在高于550°C的温度下，Ca-HTL的去除效率高于Zn-HTL。Freundlich等温线非常适合HTL的实验数据。
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