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以间苯二酚-甲醛为前驱体,二氧化硅溶胶为硬模板,采用溶胶-凝胶法制备出高孔容中孔炭材料,并利用物理担载途径制备了多种有机胺改性的中孔炭基CO2吸附剂。采用氮气吸附、热重和傅里叶红外法测定了吸附剂的物理化学特性,并研究了有机胺的种类对CO2吸附性能的影响。结果表明:中孔炭基固态胺对CO2的吸附受扩散控制,提高温度能够促进CO2扩散,增大吸附容量;小分子的胺类物质乙醇胺(MEA),二乙醇胺(DEA),二乙烯三胺(DETA)热稳定性较差,CO2吸附容量偏低;低分子量聚乙烯亚胺(PEI,分子量600)具有最优的循环吸附性能,吸附量达到190 mg/g;四乙烯五胺(TEPA)的吸附容量最大,为208mg/g,但是循环性较差,可通过加入小分子交联剂环氧氯丙烷提高其循环吸附性能。
With the resorcinol-formaldehyde as the precursor and the silica sol as the hard template, the mesoporous carbon materials with high pore volume were prepared by sol-gel method. A variety of organic amine-modified mesopores Carbon-based CO2 adsorbent. The physicochemical properties of adsorbents were determined by nitrogen adsorption, thermogravimetry and Fourier transform infrared spectroscopy. The effects of organic amine species on the adsorption properties of CO2 were also studied. The results showed that the adsorption of CO2 by the mesoporous carbon-based solid amine was controlled by diffusion. Increasing the temperature could promote the diffusion of CO2 and increase the adsorption capacity. The small molecules such as MEA, DEA, diethylenetriamine (DETA) has poor thermal stability and low CO2 adsorption capacity. Low molecular weight polyethyleneimine (PEI, molecular weight 600) has the best cyclic adsorption capacity with an adsorption capacity of 190 mg / g. Tetraethylenepentamine (TEPA) Of the maximum adsorption capacity of 208mg / g, but the poor cycle, by adding a small molecule crosslinker epichlorohydrin to improve its cyclic adsorption performance.