钙铝类水滑石衍生复合氧化物的SO_2储存性能研究  

Reaction of SO_2 over CaAl Mixed Oxides Derived from Hydrotalcites Samples

作　　者：曹琳[1] 王海林[2] 解强[1] 

机构地区：[1]中国矿业大学(北京)化学与环境工程学院,北京100083 [2]中国科学院生态环境研究中心,北京100085

出　　处：《环境科学》2013年第9期3627-3632,共6页Environmental Science

基　　金：国家自然科学基金项目(21007082)

摘　　要：采用共沉淀法制备系列钙铝类水滑石材料[CaxAl-LDH(x=1,2,3)],经高温焙烧获得其衍生复合金属氧化物.采用X射线衍射仪(XRD)、气体吸附仪(BET)、热重分析仪(DTG)、程序升温脱附(TPD)等对复合氧化物的晶体结构、比表面积和孔结构、碱性位分布等进行表征,并测定了复合金属氧化物在700℃时储存SO2的性能.结果表明,制备的CaxAl-LDH前驱物结构均一、结晶度良好,前驱物经800℃焙烧后,层间氢氧根、水和阴离子脱去形成CaO及(CaO)x(Al2O3)y的混合氧化物,随着Ca含量的增加,样品完全失重温度增高,Ca3Al-LDO具有最高的比表面积(30.8 m2.g-1)、孔容(21.3 cm3.g-1)和最多的碱性位中心,在700℃下SO2吸附量达0.29 g·g-1.Series of CaAl hydrotalcite-like compounds were synthesized by co-precipitation,and the oxides were obtained after being calcined at 800℃.XRD,BET,DTG and TPD were taken to characterize the physicochemical properties of samples,and reactions of SO2 over samples were studied.Results show that precursors were homogeneous and well crystallographic,and after being calcined with taking off the interlayer hydroxyls,water and anion,forming CaO and（CaO） x（Al2O3） y,and the Ca element enhances the thermal stability,Ca3Al-LDO has the largest surface area,the highest pore volume and the most basic center,the saturation capacity was 0.29 g.g-1 at 700℃.

关 键 词：钙铝 类水滑石 氧化物 SO2 

分 类 号：X701.3[环境科学与工程—环境工程]