Photocatalytic CO2 reduction with H2O vapors using montmorillonite/TiO2 supported microchannel monolith photoreactor

Muhammad Tahir, Nor Aishah Saidina Amin

Research output: Contribution to journalArticlepeer-review

83 Citations (Scopus)

Abstract

In this study, the performance of a montmorillonite (MMT)/TiO2 coated monolith photoreactor was tested for the photocatalytic CO2 reduction. CH4 and CO were the main products having yield rates of 139 and 52μmolegcatal.-1h-1, respectively. The other adequately significant products were C2H4, C2H6, C3H6 and C3H8. The catalytic reactor performance for CH4 production was in the order of MMT-TiO2-monolith (139μmolegcatal.-1h-1)>TiO2-monolith (82μmolegcatal.-1h-1)>MMT-TiO2-cell (43μmolegcatal.-1h-1)>TiO2-cell (7.7μmolegcatal.-1h-1). The higher yield rates in monolith photoreactor were due to the higher illuminated surface area and efficient light utilization. In addition, the profound hydrocarbon yield rates over MMT/TiO2 nanocatalyst supported microchannels were due to the efficient production and utilization of charges. The reaction rate and the adsorption-desorption phenomenon was postulated according to the Langmuir-Hinshelwood (L-H) model. A simple kinetic equation, derived to model the coupled effect of adsorptive photocatalytic reduction and oxidation, fitted-well with the experimental data.

Original languageEnglish
Pages (from-to)314-327
Number of pages14
JournalChemical Engineering Journal
Volume230
DOIs
Publication statusPublished - Aug 15 2013
Externally publishedYes

Keywords

  • CO reduction
  • Kinetic model
  • Monolith photoreactor
  • Montmorillonite

ASJC Scopus subject areas

  • General Chemistry
  • Environmental Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering

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