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Flame Synthesis of Pd-TiO2 Nanocomposite Catalyst for Oxygen Removal from CO2-rich Streams in Oxy Combustion Exhaust
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  • Sungyoon Jung,
  • Nathan Reed,
  • Gregory Yablonsky,
  • Pratim Biswas
Sungyoon Jung
Washington University in St. Louis, Washington University in St. Louis
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Nathan Reed
Washington University in St. Louis
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Gregory Yablonsky
Washington University in St. Louis
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Pratim Biswas
Washington University in St. Louis
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Abstract

Pd-TiO2 catalysts with five Pd loadings were synthesized using a flame aerosol reactor. Their initial and changed catalytic properties and kinetic characteristics during/for O2 removal with CH4 were investigated. Different Pd loadings affected the size of Pd sub-nano clusters/nanoparticles and the speciation fraction of Pd (metallic Pd, PdO and PdOx (0〈x〈1)). Increased size of Pd nanoparticles on catalysts’ surface due to sintering and the reduction of PdO to metallic Pd or/and PdOx were observed during the reaction. Fractions of the total surface area of Pd species were calculated, and correlations to the apparent reaction rate constants were established. Apparent kinetic constants were linearly proportional to fractions of total surface areas of metallic Pd or/and reduced Pd oxide were revealed, representing the intrinsic active site. The linear correlation between the O2 reaction rate and the CO2 concentration in the initial gas stream was also observed due to an autocatalytic reaction effect.

Peer review status:IN REVISION

05 Apr 2020Submitted to AIChE Journal
06 Apr 2020Submission Checks Completed
06 Apr 2020Assigned to Editor
09 Apr 2020Reviewer(s) Assigned
12 May 2020Editorial Decision: Revise Major
27 Jun 20201st Revision Received
14 Jul 2020Submission Checks Completed
14 Jul 2020Assigned to Editor
15 Jul 2020Reviewer(s) Assigned
10 Aug 2020Editorial Decision: Revise Major