Use of silica nanopowder to accelerate CO2 sorption by Ca(OH)(2)

作者：Quintanilla M A S; Valverde J M^*

来源：Particuology, 2013, 11(4): 448-453.

DOI：10.1016/j.partic.2012.06.015

• Fluidization
• Fine powders
• CO2 sorption
• Nanoparticles

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 sorption 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.

• 出版日期2013-8