Cost-effective and dynamic carbon dioxide conversion into methane using a CaTiO3@Ni-Pt catalyst in a photo-thermal hybrid system

Jae Hyung Lee, Jeong Yeon Do, No Kuk Park, Myung Won Seo, Ho Jung Ryu, Jin Pyo Hong, Yang Soo Kim, Seog K. Kim, Misook Kang

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

This research focuses on the synergy of converting carbon dioxide (CO2) into methane (CH4) by simultaneously introducing light and heat as dynamic sources to activate the catalyst. A CaTiO3@Ni-Pt catalyst, loaded with 30.0 wt.% Ni and 1.0 wt.% Pt on a perovskite CaTiO3 support was introduced. The photo-thermal catalytic hybrid system has two features that distinguish it from other photo- or thermal-catalytic systems. First, unlike the CO2 thermal-methanation reaction where CO2 and H2 react at a molar ratio of 1:4, 2.0 mol of H2 was replaced with 2.0 mol H2O in the photo-thermal catalytic hybrid system compared to the thermal-methanation reaction requiring 4.0 mol of H2. Second, by loading Ni and Pt, which are catalytic active species with excellent CO2 and H2 adsorption abilities, the CO2 reduction (46.48%) was promoted and the CH4 selectivity (99.46%) in the product was increased compared to the photo-methanation reaction. The CaTiO3@Ni-Pt not only inhibited the recombination of the photo-generated charges, but also facilitated the adsorption of the reactants in the photo-thermal hybrid system. The quantum efficiency of the CaTiO3@Ni-Pt catalyst measured for the photo-thermal hybrid system steadily increased to 180 °C. Nevertheless, this study implies that a photo-thermal hybrid system can be useful to photo-reducing CO2 by adding a small amount of heat. From a thermal reaction standpoint, a photo-thermal hybrid system can be used to reduce the reaction temperature during CO2 thermal-methanation and to reduce the consumption of H2 in half.

Original languageEnglish
Pages (from-to)219-232
Number of pages14
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume364
DOIs
StatePublished - 1 Sep 2018

Keywords

  • CH selectivity
  • CO methanation
  • CaTiO/Ni/Pt
  • Photo-thermal hybrid system

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