Use of silica nanopowder to accelerate CO_2 sorption by Ca(OH)_2

作     者：M.A.S.Quintanilla J.M.Valverde 

作者机构：Faculty of PhysicsUniversity of SevilleAvenida Reina Mercedes s/n 

出 版 物：《Particuology》 (颗粒学报（英文版）)

年 卷 期：2013年第11卷第4期

页      面：448-453页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 0817[工学-化学工程与技术] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学] 

基　　金：supported by the "Consejeria de Innovacion, Ciencia y Empresa(Junta de Andalucia)" within the European Regional Development Fund contract FQM-5735 the Spanish Government Agency "Ministerio de Ciencia e Innovacion" (contract FIS2011-25161) 

主　　题：FluidizationFine powdersCO2 sorptionNanoparticles 

摘      要：Promising technologies have recently emerged to capture CO2 from postcombustion flue gas and to enhance the production of hydrogen from natural gas by steam-methane reforming, on the basis of sorp- tion of CO2 by Ca-based powders. The rate of CO2 sorption on Ca-based powders is limited by both carbonation kinetics and transport of CO2 to unreacted sorption sites. Ca-based powders may exhibit cohesive aggregation, thus hindering gas-solids contact efficiency. In our work, we tested the sorption rate of powder samples prepared by dry mixing of a cohesive Ca（OH）2 powder with a silica nanopowder used as additive. The silica nanopowder serves to improve the dispersibility of Ca（OH）2. Consequently, when a CO2 enriched gas and the modified sorbent are brought into contact, the rate of CO2 sorption is enhanced in the initial fast phase of interest for practical applications.