The Mechanism of Low-Temperature Oxidation of Carbon Monoxide by Oxygen over the PdCl2–CuCl2/γ-Al2O3 Nanocatalyst
KAUST DepartmentAdvanced Membranes and Porous Materials Research Center
Chemical Science Program
Functional Materials Design, Discovery and Development (FMD3)
Physical Science and Engineering (PSE) Division
Permanent link to this recordhttp://hdl.handle.net/10754/627546
MetadataShow full item record
AbstractThe state of palladium and copper on the surface of the PdCl2–CuCl2/γ-Al2O3 nanocatalyst for the low-temperature oxidation of CO by molecular oxygen was studied by various spectroscopic techniques. Using X-ray absorption spectroscopy (XAS), powder X-ray diffraction (XRD), and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), freshly prepared samples of the catalyst were studied. The same samples were also evaluated after interaction with CO, O2, and H2O vapor in various combinations. It was shown that copper exists in the form of Cu2Cl(OH)3 (paratacamite) nanophase on the surface of the catalyst. No palladium-containing crystalline phases were identified. Palladium coordination initially is comprised of four chlorine atoms. It was shown by XAS that this catalyst is not capable of oxidizing CO at room temperature in the absence of H2O and O2 over 12 h. Copper(II) and palladium(II) are reduced to Cu(I) and Pd(I,0) species, respectively, in the presence of CO and H2O vapor (without O2). It was found by DRIFTS that both linear (2114 cm−1, 1990 cm−1) and bridging (1928 cm−1) forms of coordinated CO were formed upon adsorption onto the catalyst surface. Moreover, the formation of CO2 was detected upon the interaction of the coordinated CO with oxygen. The kinetics of CO oxidation was studied at 18–38 °C at an atmospheric pressure for CO, O2, N2, and H2O (gas) mixtures in a flow reactor (steady state conditions).
CitationBruk L, Titov D, Ustyugov A, Zubavichus Y, Chernikova V, et al. (2018) The Mechanism of Low-Temperature Oxidation of Carbon Monoxide by Oxygen over the PdCl2–CuCl2/γ-Al2O3 Nanocatalyst. Nanomaterials 8: 217. Available: http://dx.doi.org/10.3390/nano8040217.
SponsorsThis work was supported by the Russian Foundation for Basic Research (grant No. 16-33-00482) in the part related to the kinetic studies. Synchrotron radiation studies of catalysts were performed at the unique scientific facility of Kurchatov Synchrotron Radiation Source supported by the Ministry of Education and Science of the Russian Federation (project code RFMEFI61917X0007). L.M. Kustov and O.P. Tkachenko are thankful to Russian Scientific Foundation for financial support in the part related to the spectroscopic studies (Grant No. 14-50-00126).
Except where otherwise noted, this item's license is described as This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
- Kinetic Studies of the Pt Carbonate-Mediated, Room-Temperature Oxidation of Carbon Monoxide by Oxygen over Pt/Al<sub>2</sub>O<sub>3</sub> Using Combined, Time-Resolved XAFS, DRIFTS, and Mass Spectrometry.
- Authors: Newton MA, Ferri D, Smolentsev G, Marchionni V, Nachtegaal M
- Issue date: 2016 Oct 26
- Mo-modified Pd/Al₂O₃ catalysts for benzene catalytic combustion.
- Authors: He Z, He Z, Wang D, Bo Q, Fan T, Jiang Y
- Issue date: 2014 Jul
- Acid-modified clinoptilolite as a support for palladium-copper complexes catalyzing carbon monoxide oxidation with air oxygen.
- Authors: Rakitskaya TL, Kiose TA, Golubchik KO, Ennan AA, Volkova VY
- Issue date: 2017 Mar 27
- Skeletal Ru/Cu catalysts prepared from crystalline and quasicrystalline ternary alloy precursors: characterization by X-ray absorption spectroscopy and CO oxidation.
- Authors: Highfield J, Liu T, Loo YS, Grushko B, Borgna A
- Issue date: 2009 Feb 28
- [In-situ DRIFTS study of coupling partial oxidation of methane and carbon dioxide reforming].
- Authors: Ji HB, Xu JH, Xie JF, Chen QL
- Issue date: 2008 Jun