纳米稻壳灰为硅源合成硅酸锂陶瓷及吸附CO_(2)性能研究  

Preparation and CO_(2) Absorption Performance of Li_(4)SiO_(4) Ceramics from Nano Rice Husk Ash

作　　者：王金香[1] 王雅萱 马维思 WANG Jinxiang;WANG Yanxuan;MA Weisi(School of Material Science and Engineering,Anhui university of Science and Technology,Huainan 232001,China)

机构地区：[1]安徽理工大学材料科学与工程学院,淮南232001

出　　处：《中国陶瓷》2023年第12期51-56,共6页China Ceramics

基　　金：安徽省大学生创新创业训练计划项目(S202210361154)。

摘　　要：Li_(4)SiO_(4)吸附剂由于具有吸附容量大,吸附反应温度高,循环稳定性好等优点,在高温CO_(2)捕剂领域受到广泛关注。以稻壳灰为硅源,采用固相法合成了具有优异CO_(2)吸收性能的Li4SiO4吸附剂。实验结果表明,700℃保温6 h合成的硅酸锂材料纯度最高,吸收CO_(2)性能最好,在700℃保温20 min吸附量达31.94%,为理论转化量的86.9%。为了适应工业循环流化床的应用,以石墨为模板,采用凝胶球化法制备了Li_(4)SiO_(4)微球。Li_(4)SiO_(4)微球具有良好的球形度和丰富的孔隙结构,在吸附/解吸循环试验中,Li_(4)SiO_(4)微球表现出相对稳定的循环性能和较高的吸附容量。综上所述,以稻壳灰为硅源制备的Li4SiO4吸附剂具有良好的CO_(2)捕集前景。Lithium orthosilicate(Li_(4)SiO_(4))adsorbents have received extensive attention in the field of high-temperature CO_(2)capture due to its relatively high sorption performance,high adsorption reaction temperature,and excellent cyclic stability.In this paper,rice husk ash was used as a silicon source to synthesize Li_(4)SiO_(4)-based adsorbents with excellent CO_(2)absorption performance.The results show that Li_(4)SiO_(4)prepared at 700℃for 6h has a better purity and a higher absorption capacity.The adsorption capacity reached 31.94%at 700℃for 20 min,which was 86.9%of the theoretical conversion capacity.For the practical application in industrial circulating fluidized bed,Li_(4)SiO_(4)pellets were also prepared by gel pelletization method and graphite was used as template.The Li_(4)SiO_(4),pellets had a good sphericity and abundant pore structure and showed a relatively stable cyclic performance and high adsorption capacity during the adsorption/desorption cyclic tests.In conclusion,Li_(4)SiO_(4)adsorbents from rice husk ash have promising prospects for CO_(2)capture.

关 键 词：稻壳灰 硅酸锂 CO_(2)吸收 凝胶球化法 

分 类 号：TQ174.1[化学工程—陶瓷工业]