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CO Oxidation over Pd-Au Alloy Nanoparticle Doped Fibrous TiO2-Support Media
Current Issue
Volume 4, 2018
Issue 1 (January)
Pages: 12-23   |   Vol. 4, No. 1, January 2018   |   Follow on         
Paper in PDF Downloads: 29   Since Apr. 27, 2018 Views: 408   Since Apr. 27, 2018
Authors
[1]
Hyeon U. Shin, Exhaust Emission Engineering Team, Hyundai Motor Company, Gyeonggi-do, South Korea.
[2]
Dinesh Lolla, Bioscience Division, Parker-Hannifin Corporation, Oxnard, USA.
[3]
Ahmed Abutaleb, Department of Chemical Engineering, Jazan University, Jazan, Saudi Arabia.
[4]
Sang Y. Hwang, Plant Engineering Center, Institute of Advance Engineering (IAE), Goan-ro, South Korea.
[5]
George G. Chase, Department of Chemical and Biomolecular Engineering, The University of Akron, Akron, USA.
Abstract
Pd-Au nano-sized alloy catalysts supported on Titania (TiO2) submicron-sized fibers were fabricated by calcination of electrospun polymer template fibers and hydrazine reduction. The morphologies, crystal structure, and textural properties (surface area, pore size, and volume) of Pd-Au/TiO2 fibers materials were evaluated with electron microscopy (SEM, TEM, and HRTEM), X-ray Diffraction (XRD), and Brunauer, Emmett and Teller (BET) nitrogen adsorption. For the alloy effect induced by the Pd-Au formation, the ensemble (geometric) effect and ligand effect (charge transfer) in Pd-Au nanoparticles were investigated with X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR) to understand the formation of alloyed Pd-Au particles of different metal composition with consequent modification of their electronic and geometric properties. The catalytic activities of the materials were tested in carbon monoxide oxidation reaction using a plug-flow reactor. The results showed that the performance was optimal for a catalyst of composition Pd2Au1 molar ratio that was active at 125°C, which had higher dispersion of active components and better catalytic performance compared to monometallic particle Au/TiO2 and Pd/TiO2 fiber media. Moreover, the improved reaction activity of Pd2Au1/TiO2 fiber media was attributed to decrease in activation energy.
Keywords
Nanofibers, Catalysis, Electrospinning, Conversion, Oxidation
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