Novel thermal-swing sorption-enhanced reaction process concept for hydrogen production by low-atemperature steam-methane reforming

Ki Bong Lee, Michael G. Beaver, Hugo S. Caram, Shivaji Sircar

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61 Citations (Scopus)

Abstract

Hydrogen production by steam reforming of natural gas is a well-established technology. The possibility of using hydrogen, a nonpolluting fuel, in fuel cells has brought new interest in developing small, efficient, fuel-cell grade hydrogen production units for residential or industrial use. A novel, step-out, low-temperature, steam-methane reforming (SMR) process concept called "thermal-swing sorption-enhanced reaction" (TSSER) is described. The concept simultaneously carries out the SMR reactions at 490-590 °C and removes the byproduct CO 2 from the reaction zone in a single unit operation, thereby (a) circumventing the thermodynamic limitations of the SMR reactions and (b) directly producing a fuel-cell grade H 2 product with very high CH 4-to-H 2 conversion. A K 2CO 3 promoted hydrotalcite is used as the CO 2 selective chemisorbent in the reactor, which is periodically regenerated by steam purge at 590 °C. Model simulations of the TSSER process using recently measured CO 2 chemisorption characteristics of the promoted hydrotalcite indicate that a very compact H 2 generation unit can be designed that requires relatively low amounts of steam for regeneration. New CO 2 desorption data from the chemisorbent and its thermal stability are reported.

Original languageEnglish
Pages (from-to)5003-5014
Number of pages12
JournalIndustrial and Engineering Chemistry Research
Volume46
Issue number14
DOIs
Publication statusPublished - 2007 Jul 4
Externally publishedYes

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ASJC Scopus subject areas

  • Polymers and Plastics
  • Environmental Science(all)
  • Chemical Engineering (miscellaneous)

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