Catalytic Removal of Oxygen Impurities from Pressurized Oxy-Combustion Flue Gas for the Production of High-Purity Carbon Dioxide

Hong Lu, Ye Jiang, Oki Abiodun, Luke Schideman, Andrew Kuhn, Hong Yang, Yongqi Lu, Yongqi Lu

Research output: Contribution to journalArticlepeer-review


Flue gas purification is important for pressurized oxy-combustion systems to produce pure carbon dioxide (CO2) streams ready for storage or utilization. A catalytic approach to removing oxygen (O2) impurities from pressurized oxy-combustion flue gas via reduction with methane (CH4) was investigated in this work. Two types of catalysts were studied: palladium (Pd)-based catalysts supported on titania (TiO2) prepared by incipient wetness impregnation and cobalt-manganese (CoMn) composite catalysts prepared by coprecipitation. The performance of the catalysts was evaluated in a high-pressure-high-temperature, fixed-bed reactor at a pressure of 15 bar and a gas hourly space velocity of 30 »000 h-1(standard conditions), with a simulated feeding gas composed of 3 vol % O2, 1.5 vol % CH4, and CO2as the balance gas. Among the Pd catalysts, 5% Pd/TiO2achieved the maximum 86% O2removal at ≥350 °C. The CoMn oxide catalysts displayed comparable or better activities for O2reduction compared with the Pd catalysts. Among them, the Co40Mn1catalyst exhibited the best performance, able to reduce 99.9% of O2impurities at ∼370 °C with negligible carbon monoxide (CO) formation (<10 ppmv). Both trivalent and divalent Co and Mn were detected on the catalyst surface, and the superior activity of Co40Mn1might be associated with the resultant disordered structure. The activity of the catalyst was not affected by the presence of a trace amount of nitric oxide (NO) gas contaminant. Results of this study provide the basis for scale-up studies in both the synthesis and performance of non-noble metal catalysts.

Original languageEnglish (US)
Pages (from-to)2701-2711
Number of pages11
JournalEnergy and Fuels
Issue number5
StatePublished - Mar 3 2022

ASJC Scopus subject areas

  • General Chemical Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology


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