High-purity hydrogen production through sorption enhanced water gas shift reaction using K₂CO₃-promoted hydrotalcite

详细信息	查看全文 | 推荐本文 |

• 作者：Hyun Min Jang^a ; Ki Bong Lee^a ; ^{kibonglee@korea.ac.kr} ; Hugo S. Caram^b ; Shivaji Sircar^b
• 关键词：CO2 adsorption ; Hydrogen production ; Sorption enhanced water gas shift reaction ; K2CO3-promoted hydrotalcite ; Packed bed ; Numerical analysis
• 刊名：Chemical Engineering Science
• 出版年：2012
• 期刊代码：18_00092509
• 类别：ce
• 出版时间：7 May, 2012
• 卷：73
• 期：Complete
• 页码：431-438
• 文件大小：653 K

摘要

Sorption enhanced water gas shift (SEWGS) reaction is a process concept, which simultaneously carries out the gas phase water gas shift (WGS) reaction (CO+H₂O鈫擟O₂+H₂) and selective chemisorption of the byproduct CO₂ from the gas phase reaction zone for direct production of essentially pure H₂ in a single unit operation. A packed bed sorber-reactor containing an admixture of a WGS catalyst and a CO₂ chermisorbent is used in the process. The concept circumvents the thermodynamic limitation of the WGS reaction and enhances the rate of reaction for H₂ production. In this study, the SEWGS reaction concept was successfully demonstrated by both experiment and numerical simulation using K₂CO₃-promoted hydrotalcite as the CO₂ sorbent. Numerical model simulations were also carried out to investigate the effects of various operating conditions of SEWGS reaction on the process performance. In general, higher H₂O/CO feed ratio, higher fraction of sorbent (chemisorbent ratio in the sorber-reactor), and lower operating temperature favor both H₂ productivity and CO conversion. Higher reaction pressure increases H₂ productivity but decreases CO conversion.