Sorption enhanced water gas shift (SEWGS) reaction is a process concept, which simultaneously carries out the gas phase water gas shift (WGS) reaction (CO+H 2O↔CO 2+H 2) and selective chemisorption of the byproduct CO 2 from the gas phase reaction zone for direct production of essentially pure H 2 in a single unit operation. A packed bed sorber-reactor containing an admixture of a WGS catalyst and a CO 2 chermisorbent is used in the process. The concept circumvents the thermodynamic limitation of the WGS reaction and enhances the rate of reaction for H 2 production. In this study, the SEWGS reaction concept was successfully demonstrated by both experiment and numerical simulation using K 2CO 3-promoted hydrotalcite as the CO 2 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 H 2O/CO feed ratio, higher fraction of sorbent (chemisorbent ratio in the sorber-reactor), and lower operating temperature favor both H 2 productivity and CO conversion. Higher reaction pressure increases H 2 productivity but decreases CO conversion.
Bibliographical noteFunding Information:
This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Korea government Ministry of Education, Science and Technology (2009-0072025) , and the Energy Efficiency and Resources R&D program (2011201020004A) and the Human Resources Development Program (20114010203050) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Knowledge Economy.
- CO adsorption
- Hydrogen production
- K CO -promoted hydrotalcite
- Numerical analysis
- Packed bed
- Sorption enhanced water gas shift reaction
ASJC Scopus subject areas
- General Chemistry
- General Chemical Engineering
- Industrial and Manufacturing Engineering