论文部分内容阅读
Promising technologies have recently emerged to capture CO_2 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 CO_2 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 CO_2 enriched gas and the modified sorbent are brought into contact,the rate of CO_2 sorption is enhanced in the initial fast phase of interest for practical applications.
Promising technologies have recently emerged to capture CO_2 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 CO_2 to unreacted sorption sites. Ca-based powders may exhibit cohesive aggregation, thus hindering gas-solids contact efficiency. 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 CO 2 enriched gas and the modified sorbent are brought into contact, the rate of CO 2 sorption is enhanced in the initial fast phase of interest for practical applications.