A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Electronic effects in the coke deactivation of platinum-alumina catalysts
Abstract By means of XPS, ESR, DTA, and pyridine flash desorption techniques; micropulse reactor studies; and quantum-chemical calculations, it was shown that, during the coking of platinum-alumina catalysts in hydrocarbon media, the electron density of the platinum atom increases up to the formation of Pt0, which is a deactivating factor from the viewpoint of the electronic effects. The stabilization of the activity of platinum-alumina catalysts consists in an increase in the effective positive charge on the platinum atom; this function is fulfilled by modifier elements. It was found that the platinum protection mechanism differs, depending on the nature of the modifying additive: certain elements function via another, additional mechanism of catalyst stabilization, the blocking action. The theoretical conclusions made in this study are corroborated by the results of testing a new, Pt-Sb-Re catalyst supported on Al2O3-Cl with predicted properties.
Electronic effects in the coke deactivation of platinum-alumina catalysts
Abstract By means of XPS, ESR, DTA, and pyridine flash desorption techniques; micropulse reactor studies; and quantum-chemical calculations, it was shown that, during the coking of platinum-alumina catalysts in hydrocarbon media, the electron density of the platinum atom increases up to the formation of Pt0, which is a deactivating factor from the viewpoint of the electronic effects. The stabilization of the activity of platinum-alumina catalysts consists in an increase in the effective positive charge on the platinum atom; this function is fulfilled by modifier elements. It was found that the platinum protection mechanism differs, depending on the nature of the modifying additive: certain elements function via another, additional mechanism of catalyst stabilization, the blocking action. The theoretical conclusions made in this study are corroborated by the results of testing a new, Pt-Sb-Re catalyst supported on Al2O3-Cl with predicted properties.
Electronic effects in the coke deactivation of platinum-alumina catalysts
Vekki, A. V. (author) / Kraev, Yu. L. (author) / Solovykh, A. I. (author)
Petroleum Chemistry ; 48 ; 210-218
2008-05-01
9 pages
Article (Journal)
Electronic Resource
English
Coke Formation on Zeolites Y and Their Deactivation Model
| Springer Verlag | 2020
Effect of alkaline earth metal oxides on alumina-platinum catalysts
| Elsevier | 1973
Joint aromatization of butane and hexane on alumina-platinum catalysts
| Springer Verlag | 2011