High-purity hydrogen production through sorption enhanced water gas shift reaction using K 2CO 3-promoted hydrotalcite

Hyun Min Jang, Ki Bong Lee, Hugo S. Caram, Shivaji Sircar

Research output: Contribution to journalArticlepeer-review

87 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)431-438
Number of pages8
JournalChemical Engineering Science
Volume73
DOIs
Publication statusPublished - 2012 May 7

Bibliographical note

Funding 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.

Keywords

  • 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

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