Platinum-rhodium alloy - CAS 11107-71-4
Catalog number: 11107-71-4
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1.Gas chromatographic kinetic study of carbon monoxide oxidation over platinum-rhodium alloy catalysts.
Gavril D1, Katsanos NA, Karaiskakis G. J Chromatogr A. 1999 Aug 13;852(2):507-23.
The kinetics for the oxidation of carbon monoxide in the presence of excess oxygen over Pt-Rh alloy catalysts were studied by using the reversed-flow gas chromatography technique. Suitable mathematical analysis equations were derived by means of which the rate constants for the oxidation reaction of carbon monoxide, as well as for the adsorption and desorption of the reactant CO on the catalysts pure Pt, 75 atom% Pt+25 atom% Rh, 50 atom% Pt+50 atom% Rh, 25 atom% Pt+75 atom% Rh and pure Rh supported on SiO2 were determined. All the catalysts show a maximum rate constant for the production of CO2 at a characteristic temperature close to that found in the literature. The rate constants for the adsorption of CO increase generally with increasing temperature, while those for the desorption decrease with increasing temperature. From the variation of the rate constants with temperature activation energies for the oxidation reaction and adsorption of CO were determined, which are sensitive to the composition of the catalytic surface.
2.Tracking the shape-dependent sintering of platinum-rhodium model catalysts under operando conditions.
Hejral U1,2,3, Müller P1,2,3, Balmes O4,5, Pontoni D5, Stierle A1,2,3. Nat Commun. 2016 Mar 9;7:10964. doi: 10.1038/ncomms10964.
Nanoparticle sintering during catalytic reactions is a major cause for catalyst deactivation. Understanding its atomic-scale processes and finding strategies to reduce it is of paramount scientific and economic interest. Here, we report on the composition-dependent three-dimensional restructuring of epitaxial platinum-rhodium alloy nanoparticles on alumina during carbon monoxide oxidation at 550 K and near-atmospheric pressures employing in situ high-energy grazing incidence x-ray diffraction, online mass spectrometry and a combinatorial sample design. For platinum-rich particles our results disclose a dramatic reaction-induced height increase, accompanied by a corresponding reduction of the total particle surface coverage. We find this restructuring to be progressively reduced for particles with increasing rhodium composition. We explain our observations by a carbon monoxide oxidation promoted non-classical Ostwald ripening process during which smaller particles are destabilized by the heat of reaction.
3.Elastic characterization of platinum/rhodium alloy at high temperature by combined laser heating and laser ultrasonic techniques.
Burgess K1, Prakapenka V2, Hellebrand E3, Zinin PV4. Ultrasonics. 2014 Apr;54(4):963-6. doi: 10.1016/j.ultras.2014.01.011. Epub 2014 Jan 22.
We demonstrate an innovative pump-probe technique combined with laser heating to determine the velocity of a surface Rayleigh wave at high temperature. Laser ultrasonics in a point-source-point-receiver configuration was combined with laser heating to evaluate the elastic properties of micron size specimens. The measurements of the velocity of the surface Rayleigh wave (SRW) were conducted at 1070K.
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