Abstract
This present work aimed to investigate the influence of CO2 on HCl removal using calcined Ca–Mg–Al layered double hydroxides (CaMgAl-LDHs) at medium–high temperature (400–800 °C) in a fixed-bed reactor. It was revealed that a moderate CO2 concentration (~6%) in the flue gas of the municipal solid-waste incinerators could reduce the HCl capacity of the CaMgAl-layered double oxides (CaMgAl-LDOs). The highest capacity for HCl removal was observed over the CaMgAl-LDOs at 600 °C. However, sintering was also detected when the reaction temperature was below the calcination temperature (600 °C). Moreover, the decreasing HCl adsorption capacity of CaMgAl-LDOs was attributed to the existence of CO2 in the flue gas, which could efficiently inhibit the decomposition of carbonates as well as the conversion into metal chloride during the HCl removal process.
Highlights
In recent years, the output of municipal solid waste (MSW) in the world has remarkably increased alongside economic growth [1,2,3], especially in the developing countries
(250–450 ◦ C), hydrogen chloride (HCl) can be efficiently converted into polychlorinated dibenzodioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) [11,12]
Thereafter, the HCl capacity and breakthrough time continued to drop by 13.52% and 9.83% as the CO2 concentration further increased breakthrough time continued to drop by 13.52% and 9.83% as the CO2 concentration further increased to 12%, afterafter which thethe
Summary
The output of municipal solid waste (MSW) in the world has remarkably increased alongside economic growth [1,2,3], especially in the developing countries. Layered double hydroxides (LDHs) have attracted increasing attention based on their large interlayer surface area and potential applications, including as adsorbents, catalysts, and catalyst. The layered double oxides (LDOs), which previous reports, some LDOs, such as Ca–Mg–Al, Ca–Zn, and Mg–Fe LDOs [5,32,33], were found to possess higher specific surface areas and more active sites, can be obtained by calcining the LDHs [31]. CaMgAl-LDOs. it is expedient to study the influence of CO2 on the HCl adsorption method, while the calcined samples were applied to remove HCl in flue gas in the presence of CO2. The effects of calcination temperature, reaction temperature, CO2 concentration, initial HCl. characterizations including X-ray powder diffraction (XRD), scanning electron concentration, particle size, and gas flow rate on the efficiency of HCl removal were studied. Thermal gravimetric (TG) analyzer were employed to reveal the relationship between the adsorption capacity and characteristic properties of the CaMgAl-LDOs
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