High temperature adsorption of CO2 on Mg–Al hydrotalcite: Effect of the charge compensating anions and the synthesis pH
High temperature adsorption of CO2 on Mg–Al hydrotalcite: Effect of the charge compensating anions and the synthesis pH
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DOI：
10.1016/j.cattod.2010.10.042
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发表时间：
2011-04
期刊：
影响因子：
5.3
通讯作者：
Qiang Wang;Zhi-ming Wu;H. Tay;Luwei Chen;Yan Liu;Jie Chang;Z. Zhong;J. Luo;A. Borgna
中科院分区：
文献类型：
--
作者：
Qiang Wang;Zhi-ming Wu;H. Tay;Luwei Chen;Yan Liu;Jie Chang;Z. Zhong;J. Luo;A. Borgna
研究了电荷补偿阴离子和合成pH对镁铝水滑石结构和CO2吸附性能的影响。合成了一系列Mg3 Al 1-A（A= CO 32-，HCO 3-，NO3-，SO 42-，和Cl-）HTs，并测试了其作为高温CO2吸附剂的性能。结果表明，阴离子对HTs的热稳定性、形貌和比表面积有很大影响，从而影响HTs衍生物的CO2吸附性能。Mg3 Al 1-CO 3对CO2的吸附量最大，为0.53mmol/g。研究了合成pH对Mg3 Al 1-CO 3的Mg/Al比、BET比表面积、孔径和CO2吸附量的影响。在pH=10-12范围内合成的Mg3 Al 1-CO 3对CO2具有较好的吸附性能。通过掺杂20 wt.%的Mg3 Al 1-CO 3（pH=10），K_2CO_3的加入使CO_2吸附量提高到0.85mmol/g。
This work reported a detailed investigation on how charge compensating anions and synthesis pH affect the structural properties and CO2adsorption capacity of Mg–Al hydrotalcites (HTs). A series of Mg3Al1–A (A=CO32−, HCO3−, NO3−, SO42−, and Cl−) HTs were synthesized and tested as high temperature CO2adsorbents. It was found that the anions have great effect on the thermal stability and morphology, as well as on the surface area of HTs, consequently influencing the CO2adsorption capacity of HT derivatives. Among various HTs, Mg3Al1–CO3showed the highest CO2adsorption capacity of 0.53mmol/g. Next, the influence of synthesis pH on the Mg/Al ratio, BET surface area, pore size, and CO2adsorption capacity of Mg3Al1–CO3was investigated. Mg3Al1–CO3synthesized at pH=10–12 showed good performance for CO2adsorption. By doping Mg3Al1–CO3(pH=10) with 20wt.% K2CO3, the CO2adsorption capacity was increased up to 0.85mmol/g.