CO2 activation by methane in a dual-bed configuration via methane cracking and iron oxide lattice oxygen transport - Concept and materials development

Martin Keller, Yoshio Matsuzaki, Junichiro Otomo

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

In this work we describe a novel process configuration for CO2 activation into CO via methane cracking. This is achieved in a two-reactor configuration by circulating supported iron oxide/iron particles with deposited carbon between the two reactors. Thermodynamic equilibrium calculations indicate that reactor configurations with counter-current gas-solids flow enable a high CO yield and concentration in the product gas. With both reactors in counter-current flow at 850 °C the potentially achievable production of CO is estimated at 3.7 mol CO per mol of CH4 with 84% purity in endothermal operation and 2.7 mol CO per mol of CH4 with 88% purity in autothermal operation. Fe/support composite materials are developed for this application to fulfill the function of oxygen transport between the two reactors and serve as a substrate for solid carbon formation. Fe/BaZr0.9Y0.1O3−δ (BZY) composites exhibit rapid reduction kinetics with H2 that we ascribe to mixed-ionic-electronic conduction imparted by in-situ iron doping of the BZY support. In addition, the high proton conductivity of this support results in high CH4 decomposition rates to form solid carbon and hydrogen, likely due to the acceleration of hydrogen abstraction from the methyl group on its surface. This mixed conductivity thus results in unique properties that can be exploited in such CH4 decomposition process configurations.

Original languageEnglish
Pages (from-to)249-259
Number of pages11
JournalChemical Engineering Journal
Volume349
DOIs
Publication statusPublished - Oct 1 2018

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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