Статья

CO<sub>2</sub> Adsorption Behavior of 3-Aminopropyltrimethoxysilane-Functionalized Attapulgite with the Grafting Modification Method

Shupanxiang ChenJoint International Center for CO2 Capture and Storage (iCCS), Provincial Hunan Key Laboratory for Cost-effective Utilization of Fossil Fuel Aimed at Reducing Carbon-dioxide Emissions, Department of Chemical Engineering, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, PR ChinaBo JiaJoint International Center for CO2 Capture and Storage (iCCS), Provincial Hunan Key Laboratory for Cost-effective Utilization of Fossil Fuel Aimed at Reducing Carbon-dioxide Emissions, Department of Chemical Engineering, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, PR ChinaPeng YuJoint International Center for CO2 Capture and Storage (iCCS), Provincial Hunan Key Laboratory for Cost-effective Utilization of Fossil Fuel Aimed at Reducing Carbon-dioxide Emissions, Department of Chemical Engineering, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, PR ChinaXiao LuoJoint International Center for CO2 Capture and Storage (iCCS), Provincial Hunan Key Laboratory for Cost-effective Utilization of Fossil Fuel Aimed at Reducing Carbon-dioxide Emissions, Department of Chemical Engineering, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, PR ChinaYangqiang HuangJoint International Center for CO2 Capture and Storage (iCCS), Provincial Hunan Key Laboratory for Cost-effective Utilization of Fossil Fuel Aimed at Reducing Carbon-dioxide Emissions, Department of Chemical Engineering, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, PR ChinaBo JinJoint International Center for CO2 Capture and Storage (iCCS), Provincial Hunan Key Laboratory for Cost-effective Utilization of Fossil Fuel Aimed at Reducing Carbon-dioxide Emissions, Department of Chemical Engineering, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, PR ChinaHongxia GaoJoint International Center for CO2 Capture and Storage (iCCS), Provincial Hunan Key Laboratory for Cost-effective Utilization of Fossil Fuel Aimed at Reducing Carbon-dioxide Emissions, Department of Chemical Engineering, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, PR ChinaZhiwu LiangJoint International Center for CO2 Capture and Storage (iCCS), Provincial Hunan Key Laboratory for Cost-effective Utilization of Fossil Fuel Aimed at Reducing Carbon-dioxide Emissions, Department of Chemical Engineering, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, PR ChinaXiayi HuCollege of Chemical Engineering, Xiangtan University, Xiangtan 411105 Hunan, P. R. ChinaYefeng ZhouCollege of Chemical Engineering, Xiangtan University, Xiangtan 411105 Hunan, P. R. China

2021en

ABI

Аннотация

In this study, attapulgite (AT) was treated by high-temperature roasting and hydrochloric acid to form HcAT. It was then modified with 3-aminopropyltrimethoxysilane (APS) through the grafting method to synthesize a new adsorbent, which exhibits relatively low regenerative energy consumption in CO2 adsorption and desorption processes. Scanning electron microscopy (SEM), N2 adsorption–desorption, Fourier transform infrared spectroscopy, X-ray diffraction, and thermogravimetric analysis were selected to support the research. The CO2 adsorption process on the adsorbent was studied at different APS loadings and different temperatures. The maximal amount of CO2 adsorbed on the adsorbent is 1.81 mmol/g at 313 K when the APS mass fraction is 30%. The Freundlich isotherm model shows a great correlation with the CO2 adsorption isotherm obtained from the experimental data, and R2 reached up to 0.996. The isosteric heat while CO2 adsorbed on 30%APS-HcAT is calculated as 62.63 kJ/mol. The regeneration cyclic stability of 30%APS-HcAT is excellent, while the CO2 adsorption capacity only decreased by 3.2% after 10 cycles. The energy consumption in the CO2 desorption process was also calculated as 26.875 kJ/mol. Three different kinetic models were selected to fit the experimental data, and two models showed a great fit, which were the pseudo-second and Avrami’s fractional order models. The activation energy of 30%APS-HcAT was 38.826 kJ/mol, which can be calculated from the experimental data, and this value is higher compared with those of the other sorbents modified by the impregnation method and also much lower than the value of the chemical absorption process between traditional amine solvents and CO2.

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Идентификаторы

DOI: 10.1021/acs.iecr.1c03436

Цитирования и источники

Цитирований: 2Использованных источников: 0

Показатели — AkademScholar