Journal ArticleDOI
Alloy formation and metal oxide segregation in PtRe/γ-AlO catalysts as investigated by temperature-programmed reduction
N Wagstaff,Roel Prins +1 more
TLDR
In this article, the formation of "bimetallic clusters" supports the Alloy explanation for the improved performance of this type of bimetallic reforming catalyst, and it is shown that in the presence of adsorbed oxygen the Pt-Re clusters are thermodynamically unstable but that under mild conditions the rate of segregation is slow.About:
This article is published in Journal of Catalysis.The article was published on 1979-10-15. It has received 167 citations till now. The article focuses on the topics: Temperature-programmed reduction & Catalysis.read more
Citations
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Journal ArticleDOI
Temperature Programmed Reduction
TL;DR: In this paper, the success or otherwise of catalyst preparation or modification depends on the availability of suitable characterization techniques to determine the condition of the catalyst, and none of these techniques has proved to be wholly reliable or generally applicable to the characterization of catalysts under working conditions.
Journal ArticleDOI
Temperature-Programmed Reduction. Parametric Sensitivity and Estimation of Kinetic Parameters
Daniele Monti,Alfons Baiker +1 more
TL;DR: In this article, the influence of the different experimental operating variables used in temperature-programmed reduction (TPR) measurements on the reduction profiles has been studied using the reduction of nickel oxide as an example.
Journal ArticleDOI
Reactions of platinum in oxygen- and hydrogen-treated Ptγ-Al2O3 catalysts: I. Temperature-programmed reduction, adsorption, and redispersion of platinum
TL;DR: In this paper, a model for the redispersion of Pt in oxygen is proposed and two surface oxides, α- and β-[PtO2]s, and two chloride-containing surface complexes are found and a comprehensive scheme of surface reactions is proposed.
Journal ArticleDOI
Nanostructured Pt- and Ni-based catalysts for CO2-reforming of methane
TL;DR: In this paper, the effect of using a nanofibrous Al 2 O 3 as support for Ni-based catalysts, modified with Pt, for the dry reforming of methane (DRM) was studied.
Journal ArticleDOI
Conversion of n-hexane over monofunctional supported and unsupported PtSn catalysts
TL;DR: In this article, the ensemble effect was observed in the conversion of n-hexane over Pt upon its being alloyed with Sn and the change in selectivity can be interpreted in terms of a change in adsorption properties due to differences in the number of adjacent platinum atoms required for the various reaction pathways (ensemble effect).
References
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Journal ArticleDOI
Supported “bimetallic cluster” catalysts
TL;DR: In this paper, it was shown that ruthenium or osmium concentration in the catalysts was held constant at 1 wt% while the atomic ratio of copper-to-RUThenium ratio was varied from 0 to 1.
Journal ArticleDOI
Determination of reducibility and identification of alloying in copper-nickel-on-silica catalysts by temperature-programmed reduction
TL;DR: In this paper, the reduction characteristics of various copper, nickel, and copper-nickel-on-silica catalysts have been examined using a temperature-programmed technique, which involves a continuous and quantitative monitoring of the hydrogen uptake due to the reduction of a particular species on the catalyst surface.
Journal ArticleDOI
Platinum-rhenium-alumina catalysts: II. Study of the metallic phase after reduction
C. Bolivar,H. Charcosset,Roger Fréty,Michel Primet,L. Tournayan,C. Betizeau,G. Leclercq,R. Maurel +7 more
TL;DR: Two percent (Pt + Re ) Al 2 O 3 catalysts prepared by co-impregnation of Al2O3 with H2PtCl6 and Re2O7 and generally reduced by hydrogen at 500 °C were mainly investigated by thermogravimetry (H2O2 cycles at 25 °C), electron microscopy, and infrared spectroscopy (chemisorption of CO at 25°C) as mentioned in this paper.