Journal ArticleDOI
Sintering studies on platinum black catalysts. Part 1.—Effect of pretreatment and reaction on particle size
TLDR
In this article, it was shown that the sintering of a platinum black catalyst was most affected by the presence of hydrogen which caused considerable growth in crystallite size, and it was possible that apparent effects of reaction and thermal treatment may have, in previous work, been caused by pre-treatment in hydrogen.Abstract:
Counter claims appear in the literature on the effects of the particle size, sintering and pre-treatment of a catalyst on its activity. We have investigated these by studying a platinum black catalyst and the way in which helium, hydrogen, air, oxygen and thermal cycling affect the particle size as seen in the electron microscope. By making a logical sequence of experiments it has been possible to show that the sintering of the catalyst was most affected by the presence of hydrogen which caused considerable growth in crystallite size. It thus seems possible that apparent effects of reaction and thermal treatment may have, in previous work, been caused by pre-treatment in hydrogen.read more
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Journal ArticleDOI
Sintering kinetics of supported metals: new perspectives from a unifying GPLE treatment
TL;DR: In this article, the effects of atmosphere, time, temperature, support, promoters, and metal on the thermal stability of supported metal catalysts were investigated. But the analysis of these data was restricted to the case of supported metals.
Book ChapterDOI
Compensation Effect in Heterogeneous Catalysis
TL;DR: The compensation effect remains largely an empirical method of classifying kinetic observations and this has not been developed into a theoretical representation capable of predicting activities and patterns of reactivity in hitherto untested catalytic processes.
Journal ArticleDOI
Hydrogen effects in metal catalysts
Z. Paál,P. G. Menon +1 more
TL;DR: The interaction of hydrogen with metals is the cause or basis of a host of phenomena ranging from the chemisorption of hydrogen on the surface, its dissolution in the metal, catalytic reactions involving hydrogen as a reactant or as an astoichiometric component, etc., to the formation of metal hydrides as discussed by the authors.
Journal ArticleDOI
Sulfur adsorbed on Pt catalyst: its chemical state and effect on catalytic properties as studied by electron spectroscopy and n-hexane test reactions
TL;DR: In this article, electron spectroscopy of fresh Pt black samples in a fresh state, deactivated by coking and treated with H2S, were studied with electron spectrograms.
Book ChapterDOI
Metal-Catalyzed Cyclization Reactions of Hydrocarbons
TL;DR: In this paper, the authors focus on the metal-catalyzed cyclization reactions, with reference to oxide and dual-function catalysts, and make an attempt to correlate primary adsorption with two main factors: the nature of the metal and the amount of hydrogen available during the catalytic process.