Chemical reactions and kinetics of a low-temperature water gas shift reaction heated by microwaves

Wei-Hsin Chen, Tsung Chieh Cheng, Chen I. Hung, Bo Jhih Lin

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Chemical reaction characteristics of a water gas shift reaction (WGSR) heated by microwaves are investigated experimentally where a Cu-Zn-based catalyst is employed. The experiments indicate that the performance of the low-temperature shift reaction (LTSR) increases with increasing temperature and steam/CO molar ratio. The effect of increasing temperature on CO conversion with microwave heating is contrary to that with conventional heating where the thermodynamic equilibrium dominates the LTSR in the latter. It follows that the reactions of the LTSR with microwave heating are governed by chemical kinetics. To further figure out the reaction phenomena inside the catalyst bed with microwave irradiation, a new chemical kinetic model accounting for the behavior of the LTSR are developed and the reaction phenomena are simulated numerically. In the numerical method, the continuity, momentum, energy and species equations as well as the electromagnetic fields are simultaneously solved. It is of interest that the temperature distribution in the catalyst bed is nearly uniform due to the exothermic reaction featured. When the thermal behavior of the LTSR is examined, heat generation stemming from microwave irradiation is always larger than that from the chemical reaction.

Original languageEnglish
Pages (from-to)276-289
Number of pages14
JournalInternational Journal of Hydrogen Energy
Volume37
Issue number1
DOIs
Publication statusPublished - 2012 Jan 1

Fingerprint

Water gas shift
Reaction kinetics
Chemical reactions
chemical reactions
reaction kinetics
Microwaves
microwaves
shift
gases
water
Microwave heating
Microwave irradiation
Temperature
Catalysts
catalysts
heating
beds
Exothermic reactions
Heat generation
irradiation

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

Cite this

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abstract = "Chemical reaction characteristics of a water gas shift reaction (WGSR) heated by microwaves are investigated experimentally where a Cu-Zn-based catalyst is employed. The experiments indicate that the performance of the low-temperature shift reaction (LTSR) increases with increasing temperature and steam/CO molar ratio. The effect of increasing temperature on CO conversion with microwave heating is contrary to that with conventional heating where the thermodynamic equilibrium dominates the LTSR in the latter. It follows that the reactions of the LTSR with microwave heating are governed by chemical kinetics. To further figure out the reaction phenomena inside the catalyst bed with microwave irradiation, a new chemical kinetic model accounting for the behavior of the LTSR are developed and the reaction phenomena are simulated numerically. In the numerical method, the continuity, momentum, energy and species equations as well as the electromagnetic fields are simultaneously solved. It is of interest that the temperature distribution in the catalyst bed is nearly uniform due to the exothermic reaction featured. When the thermal behavior of the LTSR is examined, heat generation stemming from microwave irradiation is always larger than that from the chemical reaction.",
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Chemical reactions and kinetics of a low-temperature water gas shift reaction heated by microwaves. / Chen, Wei-Hsin; Cheng, Tsung Chieh; Hung, Chen I.; Lin, Bo Jhih.

In: International Journal of Hydrogen Energy, Vol. 37, No. 1, 01.01.2012, p. 276-289.

Research output: Contribution to journalArticle

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