Performance analysis of nanostructured NiO-In2O3/TiO2 catalyst for CO2 photoreduction with H2 in a monolith photoreactor

Muhammad Tahir, Nor Aishah Saidina Amin

Research output: Contribution to journalArticlepeer-review

90 Citations (Scopus)

Abstract

The photocatalytic reduction of CO2 with H2 over nickel (Ni) and indium (In) co-doped TiO2 nanocatalysts in a monolith photoreactor has been investigated. The structure and properties of catalysts, prepared via modified sol-gel method with different metal-doping levels, were characterized by XRD, SEM, TEM, N2 adsorption-desorption, XPS, UV-vis and PL spectrophotometry. Both nickel and indium, present over TiO2 as Ni2+ and In3+, promoted efficient separation of photo-generated charges (e-/h+). The CO2 reduction efficiency was more significant for H2 compared to H2O vapors. TiO2 modified with 1.0wt.% NiO and 3.5wt.% In2O3 registered the highest CO yield. In a batch process, the maximum yield rate of CO over NiO-In2O3/TiO2 catalyst at 99.7% selectivity was 12,029μmolg-catal.-1h-1; 5.9 and 207 folds higher than In2O3/TiO2 and TiO2 catalysts, respectively. Similarly, CO2 conversion over NiO-In2O3/TiO2 (10.2%) was more substantial than In2O3/TiO2 (6.42%) and pure TiO2 (1.7%). In a continuous process, CO production rate was slightly decreased, but more CO2 was processed over the entire irradiation time. Significantly enhanced quantum efficiency of a monolith photoreactor over NiO-In2O3/TiO2 catalyst was observed compared to the cell reactor obviously due to greater mobility of charges with hindered recombination rate and higher photonic efficiency. The stability of NiO-In2O3/TiO2 catalyst was partially reduced after several cyclic runs.

Original languageEnglish
Pages (from-to)635-649
Number of pages15
JournalChemical Engineering Journal
Volume285
DOIs
Publication statusPublished - Feb 1 2016
Externally publishedYes

Keywords

  • CO reduction
  • H reductant
  • Monolith photo-reactor
  • NiO-InO/TiO
  • Performance analysis
  • Photocatalysis

ASJC Scopus subject areas

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

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