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A novel lithium orthosilicate based adsorbent doping with halloysite nanotubes(HNTs) was synthesized with Kaolin clay and SiO_2 by an impregnation-precipitation method.The samples were characterized by X-ray diffraction and scanning electron microscopy,nitrogen adsorption-desorption isotherm analysis and thermo-gravimetry,respectively.The results indicate that the reactivity of Li_4SiO_4 for CO_2 absorption can be enhanced by doping alumina.Different aluminum sources result in different degrees of the CO_2 adsorption performance.It is also found that the CO_2 capture amount of the adsorbent doping with Halloysite nanotubes is 15.25 wt.%at 560 ℃,which is better than that of the adsorbent doping with γ-Al_2O_3(i.e.,10.88 wt.%).
A novel lithium orthosilicate based adsorbent doping with halloysite nanotubes (HNTs) was synthesized with Kaolin clay and SiO_2 by an impregnation-precipitation method. These samples were characterized by X-ray diffraction and scanning electron microscopy, nitrogen adsorption-desorption isotherm analysis and thermo- gravimetry, respectively. The results indicate that the reactivity of Li_4SiO_4 for CO_2 absorption can be enhanced by doping alumina. Different aluminum sources result in different degrees of the CO_2 adsorption performance. It is also found that the CO_2 capture amount of the adsorbent doping with Halloysite The nanotubes are 15.25 wt.% at 560 ° C, which is better than that of the adsorbent doping with γ-Al 2 O 3 (ie, 10.88 wt.%).