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Article

Kinetics of CO Oxidation over Unloaded and Pd-Loaded α-Fe2O3 Spherical Submicron Powder Catalysts: Photoacoustic Investigations at Low Pressure

1
Department of Chemistry, Yonsei University, Seoul 03722, Korea
2
Department of Chemistry, Yonsei University, Wonju 26493, Korea
*
Authors to whom correspondence should be addressed.
Catalysts 2018, 8(3), 98; https://doi.org/10.3390/catal8030098
Received: 29 January 2018 / Revised: 23 February 2018 / Accepted: 24 February 2018 / Published: 28 February 2018
(This article belongs to the Special Issue Conversion of CO2 into CO Using Heterogeneous Catalysis)
In this study, α-Fe2O3 spherical particles with an average diameter of approximately 200 nm were synthesized by a solvothermal method for use as both a catalyst and medium for a Pd catalyst. The kinetics of CO oxidation over powders of α-Fe2O3 spherical particles and 14 wt % Pd/α-Fe2O3 spherical particles were measured in a static reactor by using a CO2 laser-based photoacoustic technique. The total pressure was fixed at 40 Torr for the CO/O2/N2 mixture for temperatures in the range of 225–350 °C. The variation in the CO2 photoacoustic signal with the CO2 concentration during CO oxidation was recorded as a function of time, and the CO2 photoacoustic data at the early reaction stage was used to estimate the rates of CO2 formation. Based on plots of ln(rate) vs. 1/T, apparent activation energies were calculated as 13.4 kcal/mol for the α-Fe2O3 submicron powder and 13.2 kcal/mol for the 14 wt % Pd/α-Fe2O3 submicron powder. Reaction orders with respect to CO and O2 were determined from the rates measured at various partial pressures of CO and O2 at 350 °C. The zero-order of the reaction with respect to Po2 was observed for CO oxidation over α-Fe2O3 submicron powder, while 0.48 order to Po2 was observed for CO oxidation over Pd/α-Fe2O3 submicron powder. The partial orders with respect to PCO were determined as 0.58 and 0.54 for the α-Fe2O3, and the Pd/α-Fe2O3 submicron powders, respectively. The kinetic results obtained from both catalysts were compared with those for the α-Fe2O3 fine powder catalysts and were used to understand the reaction mechanism. View Full-Text
Keywords: photoacoustic technique; kinetics of CO oxidation; α-Fe2O3 spherical powder catalyst; Pd/α-Fe2O3 catalyst photoacoustic technique; kinetics of CO oxidation; α-Fe2O3 spherical powder catalyst; Pd/α-Fe2O3 catalyst
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MDPI and ACS Style

Roh, J.-S.; Kim, J.-Y.; Choi, J.-G.; Lee, S.-H. Kinetics of CO Oxidation over Unloaded and Pd-Loaded α-Fe2O3 Spherical Submicron Powder Catalysts: Photoacoustic Investigations at Low Pressure. Catalysts 2018, 8, 98. https://doi.org/10.3390/catal8030098

AMA Style

Roh J-S, Kim J-Y, Choi J-G, Lee S-H. Kinetics of CO Oxidation over Unloaded and Pd-Loaded α-Fe2O3 Spherical Submicron Powder Catalysts: Photoacoustic Investigations at Low Pressure. Catalysts. 2018; 8(3):98. https://doi.org/10.3390/catal8030098

Chicago/Turabian Style

Roh, Joong-Seok, Ji-Yeong Kim, Joong-Gill Choi, and Sung-Han Lee. 2018. "Kinetics of CO Oxidation over Unloaded and Pd-Loaded α-Fe2O3 Spherical Submicron Powder Catalysts: Photoacoustic Investigations at Low Pressure" Catalysts 8, no. 3: 98. https://doi.org/10.3390/catal8030098

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