Reversible chemisorption of carbon dioxide: Simultaneous production of fuel-cell grade H2 and compressed CO2 from synthesis gas

K. B. Lee, M. G. Beaver, H. S. Caram, S. Sircar

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

One vision of clean energy for the future is to produce hydrogen from coal in an ultra-clean plant. The conventional route consists of reacting the coal gasification product (after removal of trace impurities) with steam in a water gas shift (WGS) reactor to convert CO to CO2 and H2, followed by purification of the effluent gas in a pressure swing adsorption (PSA) unit to produce a high purity hydrogen product. PSA processes can also be designed to produce a CO2 by-product at ambient pressure. This work proposes a novel concept called "Thermal Swing Sorption Enhanced Reaction (TSSER)" which simultaneously carries out the WGS reaction and the removal of CO2 from the reaction zone by using a CO2 chemisorbent in a single unit operation. The concept directly produces a fuel-cell grade H2 and compressed CO2 as a by-product gas. Removal of CO2 from the reaction zone circumvents the equilibrium limitations of the reversible WGS reaction and enhances its forward rate of reaction. Recently measured sorption-desorption characteristics of two novel, reversible CO 2 chemisorbents (K2CO3 promoted hydrotalcite and Na2O promoted alumina) are reviewed and the simulated performance of the proposed TSSER concept using the promoted hydrotalcite as the chemisorbent is reported.

Original languageEnglish
Pages (from-to)385-397
Number of pages13
JournalAdsorption
Volume13
Issue number3-4
DOIs
Publication statusPublished - 2007 Aug
Externally publishedYes

Keywords

  • Carbon dioxide
  • Chemisorption
  • Hydrogen
  • Promoted alumina
  • Promoted hydrotalcite
  • Thermal swing sorption enhanced reaction

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Surfaces and Interfaces

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