摘要
采用高温固相合成法和沉淀法分别制备了高温CO2吸附剂正硅酸锂(Li4SiO4),利用X射线粉末衍射仪(XRD)和扫描电镜(SEM)对吸附剂进行表征,化学吸附仪测试CO2吸附/脱附性能,研究了合成方法、焙烧温度、锂硅物质的量比和不同硅源对吸附剂的影响。实验结果表明,在750℃下沉淀法制备的吸附剂比固相法合成的颗粒分布均匀,经过6次CO2(VCO2/VHe=1∶5)吸附-解吸循环后,以SiO2-II为硅源的沉淀法吸附剂吸附量由13.38%降为9.92%,解吸量由11.74%降为8.52%;以SiO2-I为硅源的沉淀法吸附剂的吸附量、解吸量大约下降2.61%、2.39%,固相法吸附剂的吸附量、解吸量分别下降1.85%、1.42%。
The Lithium-based sorbents for high temperature CO2 capture were prepared through solid-state reaction method and precipitation method, which were characterized by X-ray diffraction（XRD） and scanning electronic microscopy（SEM）. The COz absorption performance was evaluated by the chemical BET absorption（CHEMBET） method and the impact factors （including synthetic method, calcination temperature, molar ratio of Li to Si and different silica sources） were studied. The results indicated that the particle size of the adsorbents synthesized by the precipitation method distributed more homogeneous than that of the adsorbents synthesized by the solid-state reaction method at 750 ℃. Meanwhile, BET surface area of former was larger than that of latter. After six times CO2 （carbon dioxide to helium in a volume ratio of 1 ： 5） recycles, adsorption capacity of precipitation-method adsorbents using SiO2-Ⅱ reduced to 9.92% from 13.38%, and desorption amount decreased from 11.74% to 8.52%. However, the amounts of adsorption and desorption of precipitation-method adsorbents using SiO2-I were reduced by 2.61% and 2.39%, those of solid-state-method adsorbents reduced by 1.85 % and 1.42%.
出处
《石油化工高等学校学报》
CAS
2015年第3期12-16,共5页
Journal of Petrochemical Universities
基金
国家自然科学基金项目(21103077)
新世纪优秀人才支持计划(NCET-11-1011)
关键词
正硅酸锂
二氧化碳
高温固相法
沉淀法
Lithium-based sorbent
Carbon dioxide
Solid-state reaction method
Precipitation method
