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 journalArticle

69 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

Keywords

  • CO adsorption
  • Hydrogen production
  • K CO -promoted hydrotalcite
  • Numerical analysis
  • Packed bed
  • Sorption enhanced water gas shift reaction

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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