类水滑石Ti/Li/Al-LDHs的制备及其CO_2吸附性能  

Preparation of hydrotalcite-like Ti/Li/Al-LDHs and its performance in CO_2 adsorption

作　　者：孔婷婷[1] 董羿蘩 张颖萍[1] 张亚刚[1] 周安宁[1] 

机构地区：[1]西安科技大学化学与化工学院,陕西西安710054

出　　处：《燃料化学学报》2016年第8期1017-1024,共8页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金(51074122)资助~~

摘　　要：采用共沉淀法制备了一系列新型的类水滑石Ti/Li/Al-LDHs材料,通过原子吸收光谱(AAS)、X射线衍射(XRD)、扫描电镜(SEM)、热重分析(TG)和傅里叶变换红外光谱(FT-IR)等技术对其进行了表征,研究了不同金属元素比例和焙烧温度对该Ti/Li/Al-LDHs材料的结构、形貌及其CO_2吸附性能的影响。结果表明,当Ti/Li/Al比为1∶3∶4时,水滑石Ti/Li/AlLDHs的结晶度最好,形貌最规整,而Ti/Li/Al比为1∶3∶2、300℃下焙烧后得到的Ti_1Li_3Al_2-LDHs_(300)的CO_2吸附性能最好。Ti_1Li_3Al_2-LDHs_(300)上CO_2吸附量可达53.5 mg/g,10次循环吸附后,CO_2吸附量仅下降了2.4%。A series of hydrotalcite-like Ti/Li/Al-LDHs materials were prepared by co-precipitation method and characterized by atomic absorption spectrophotometer （ AAS ） , X-ray diffraction （ XRD ） , scanning electron microscopy （ SEM） , thermal gravimetric analysis （ TG） and Fourier transform infrared （ FT-IR）; the influence of metal composition and calcination temperature on the structure, morphology and CO2 adsorption capacity of Ti/Li/Al-LDHs was investigated. The results showed that Ti1 Li3 Al4-LDHs obtained with a Ti/Li/Al ratio of 1：3：4 displays the highest crystallinity and regular morphology, whereas Ti1 Li3 Al2-LDHs300 prepared with a Ti/Li/Al ratio of 1：3：2 and calcined at 300℃ exhibits the best adsorption performance towards CO2 . The CO2 adsorption capacity over Ti1 Li3 Al2-LDHs300 reaches 53. 5 mg/g; in addition, the adsorption capacity is only decreased by 2. 4% after adsorption for 10 cycles.

关 键 词：水滑石 Ti/Li/Al-LDHs 金属元素 焙烧 二氧化碳 吸附 

分 类 号：TQ424.1[化学工程]