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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

The role of Pt-FexOy interfacial sites for CO oxidation

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Author(s):
Ro, Insoo [1, 2] ; Aragao, Isaias B. [3, 1] ; Chada, Joseph P. [1] ; Liu, Yifei [1] ; Rivera-Dones, Keishla R. [1] ; Ball, Madelyn R. [1] ; Zanchet, Daniela [3] ; Dumesic, James A. [1] ; Huber, George W. [1]
Total Authors: 9
Affiliation:
[1] Univ Wisconsin, Dept Chem & Biol Engn, 1415 Engn Dr, Madison, WI 53706 - USA
[2] Univ Calif Santa Barbara, Dept Chem Engn, Santa Barbara, CA 93106 - USA
[3] Univ Campinas UNICAMP, Inst Chem, POB 6154, BR-13083970 Campinas, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: JOURNAL OF CATALYSIS; v. 358, p. 19-26, FEB 2018.
Web of Science Citations: 11
Abstract

Supported Pt catalysts with different Fe/Pt atomic ratios were synthesized using controlled surface reactions to deposit (cyclohexadiene) iron tricarbonyl onto Pt/SiO2 to create Pt-FexOy interfacial sites. X-ray photoelectron spectroscopy measurements show that Pt and Fe species exist as metallic Pt and Fe oxides phases, respectively, after treatment in H-2 at 573 K, whereas Fe becomes more oxidized under reaction conditions for CO oxidation at 313 K (CO:O-2 = 1:1). The addition of Fe increases the turnover frequency of Pt1Fex/SiO2 at 313 K and atmospheric pressure by up to two orders of magnitude compared to Pt/SiO2. The reaction order with respect to the O-2 partial pressure suggests that O-2 adsorption on the surface is likely to be a rate controlling step for both Pt/SiO2 and Pt1Fe0.2/SiO2. The enhanced activity over Pt1Fex/SiO2 catalysts compared to Pt/SiO2 can be associated with a lower energy barrier for O-2 adsorption and activation over Pt-FexOy interfacial sites. (C) 2017 Elsevier Inc. All rights reserved. (AU)

FAPESP's process: 15/23900-2 - Earth-abundant materials as next-generation catalytic platforms for the conversion of lignocellulosic biomass
Grantee:Daniela Zanchet
Support Opportunities: Scholarships abroad - Research
FAPESP's process: 15/20477-1 - Synthesis of monodisperse bimetallic catalysts: organometallic complexes deposited on platinum clusters
Grantee:Isaias Barbosa Aragão
Support Opportunities: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 14/21988-7 - Carbonyl organometallic precursors for supported catalysts synthesis: in situ studies and hydrogen production
Grantee:Isaias Barbosa Aragão
Support Opportunities: Scholarships in Brazil - Doctorate