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采用固相合成法和溶胶凝胶法分别制备了可直接在高温下吸收CO2的硅酸锂(Li4SiO4),并进行了Ti的掺杂改性.采用X射线衍射仪、比表面积测定仪和热重分析仪对Li4SiO4进行了表征及CO2吸收性能的测试,并在固定床台架上进行了CO2循环吸收/解吸的试验研究.结果表明:溶胶凝胶法制备的纯Li4SiO4更有利于在高温下对CO2的吸收;CO2的分压对高温下Li4SiO4吸收CO2有很大影响,分压越大,吸收的CO2量越大;当TiO2的掺杂比例x=0.02时,改性的Li4SiO4对CO2的最大吸收量可达31.59%;经过20次循环后,固溶体Li4Si0.98Ti0.02O4对CO2的吸收量仅下降了20%,从第4次循环后此样品基本达到完全再生,说明其具有较大的CO2吸收量和优良的再生性能.
Lithium silicate (Li4SiO4), which can absorb CO2 directly at high temperature, was prepared by solid state synthesis and sol-gel method, respectively, and doping modification of Ti was also carried out.Using X-ray diffractometer, specific surface area analyzer and heat Re-analyzer Li4SiO4 was characterized and CO2 absorption performance test, and carried out on a fixed bed bench CO2 cycle absorption / desorption test results show that: sol gel prepared pure Li4SiO4 more conducive to high temperature The partial pressure of CO2 has a great influence on the CO2 absorption of Li4SiO4 under high temperature. The larger the partial pressure is, the larger the amount of CO2 absorbed is. When the doping ratio of TiO2 is 0.02, the effect of modified Li4SiO4 on CO2 The maximum absorption up to 31.59%; after 20 cycles, the solid solution Li4Si0.98Ti0.02O4 on the CO2 absorption decreased by only 20%, after the fourth cycle of this sample basically complete regeneration, indicating that it has a larger CO2 absorption and excellent regeneration performance.