Adsorption of HCl on Calcined Ca and Zn Hydrotalcite-like Compounds (HTLs) at Medium-High Temperature in Flue Gas
Adsorption of HCl on Calcined Ca and Zn Hydrotalcite-like Compounds (HTLs) at Medium-High Temperature in Flue Gas
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DOI：
10.1021/acs.iecr.8b03092
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发表时间：
2018-12
影响因子：
4.2
通讯作者：
Jun Cao;Tianyu Chen;Baosheng Jin;Yaji Huang;Chunhong Hu
中科院分区：
文献类型：
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作者：
Jun Cao;Tianyu Chen;Baosheng Jin;Yaji Huang;Chunhong Hu
城市固体废物焚化炉在350-650 °C时产生的高浓度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，钙（Ca）和锌（Zn）类水滑石化合物（HTLs）制备去除HCl在不同的反应温度和初始HCl浓度。采用热重分析、X射线粉末衍射、扫描电子显微镜和比表面积测量等方法研究了HTLs和煅烧HTLs（HTOs）对HCl的吸附机理。Ca-和Zn-HTLs具有相似的结构和理化性质。两种吸附剂对HCl都具有良好的吸附能力，在550 °C下在750 mg/g的HCl浓度下超过456 min超过90%。在350 °C时，Zn-HTOs的吸附性能优于Ca-HTOs。在高于550 °C的温度下，Ca-HTLs的去除效率高于Zn-HTLs。Freundlich等温线提供了一个很好的适合...
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 ...