ChemInform Abstract: REACTIONS OF PLATINUM IN OXYGEN‐ AND HYDROGEN‐TREATED PLATINUM/Γ‐ALUMINA CATALYSTS. I. TEMPERATURE‐PROGRAMMED REDUCTION, ADSORPTION, AND REDISPERSION OF PLATINUM

Abstract

Pt/γ‐Al2O3‐Katalysatoren mit und ohne Chlorid werden bei verschiedenen Temp. mit O2 bzw. H2 behandelt und mittels Temp.‐programmierter Reduktion sowie H‐Adsorption untersucht.

Effect Of The Solvent Used During Preparation On The Properties Of Pt/Al2O3 And Pt−Sn/Al2O3 Catalysts

“…However, in the case of acetone, the H 2 consumption was lower and this can be assigned to a previous platinum reduction as suggested by the gray color of the solid after calcination, in accordance with previous works. 30 For the Sn/Al 2 O 3 catalysts, similar profiles were obtained regardless the solvent used. The hydrogen consumption is similar for the catalysts prepared using water and ethanol and higher for the catalyst prepared using acetone.…”

“…The second peak includes the partial reduction of segregated Sn, 31 probably stabilized by the support forming tin aluminates species. 5,17,30,32,33 The presence of Sn shifts the first peak toward higher temperatures compared with Pt/Al 2 O 3 , while the second reduction peak of Pt is suppressed. For Pt-Sn/Al 2 O 3 (a), there is a shift of the first peak to lower temperatures compared with the material prepared using water.…”

On-board H2 generation by catalytic dehydrogenation of hydrocarbon mixtures or fuels

“…TPR of fresh Cat1 (dot line) and Cat3 (full line). of two peaks, the first one attributable to the reduction of surface Pt IV to Pt 0 and the second, at higher temperature, probably due to a core and shell effect [20,22] or a strong interaction of the Pt with the support [23,24]. The addition of Sn significantly modify the reduction profile; Cat3 show a shoulder at low temperature again attributable to Pt IV reduction, with further three peaks at higher temperatures.…”

Etude in situ par analyse EXAFS d'un catalyseur de reformage Pt-Sn/Al2O3-Cl

“…La simulation est réalisée sur les pics représentant les premiers voisins : 1,2 à 3,2 A. [19], sur un catalyseur Pt/AIz@, l'oxyde de platine Pt02 se décompose en platine métallique sous air si la température est supérieure à 600°C. La formation de cristallites de platine sur le catalyseur neuf peut être expliquée par la méthode de préparation de ce catalyseur Pt-SnlA1203-Cl.…”