Different strong metal-support interaction effects on rhodium/titanium dioxide and platinum/titanium dioxide catalysts

The influence of catalytic activity on the response of Pt/SnO2 gas sensors to carbon monoxide and hydrogen

“…Unfortunately, there are some factors which affect chemisorption. In the case of noble metals, Strong Metal Support Interactions (SMSI) can influence chemisorption properties of catalysts to a great extent [32]. The real mechanism of metal support interaction is not always clear, but it is usually observed for reducible supports and after the reduction of catalyst at high temperatures.…”

Effect of Sn addition to Pt/CeO2–Al2O3 and Pt/Al2O3 catalysts: An XPS, 119Sn Mössbauer and microcalorimetry study

“…Catalysts supported on reducible oxides have shown interesting catalytic and chemisorption properties, such as a decrease in H 2 chemisorption ability [6], suppression of alkane hydrolysis activity, increase in CO hydrogenation activity [7], and improvement in selectivity of crotyl alcohol for crotonaldehyde hydrogenation [8][9][10] when catalysts are subjected to high temperature reduction (> 773 K). Electron microscopy studies have shown that after high temperature reduction, partially reduced oxide species migrate, and decorate the metal surface [4][5][6]11,12]. Bernal, et al have shown that in the case of a Pt/CeO 2 catalyst this decoration occurs at a reduction temperature of 973 K and CePt 5 particles are formed at temperatures of 1173 K [13].…”

Comparison of hydrogenation and hydrogenolysis on unsupported and silica-supported Rh–V2O3 and Pt–V2O3

“…While all reports agree that metal-oxide interaction between Group VIII metals and reducible oxides decreases H, chemisorption capacity, some model studies of Pt/TiO, find no change in the heat of a d s ~r p t i o n ~~ and others find a de~rease.~O Because KO and G ~r t e ~~ studied TiO, deposited on a Pt foil, where a morphology change of the metal is unlikely, while Belton et al 40 studied Pt films on TiO,, where a morphology change of the metal is very likely with heat treatment, it is probable that the change in heat of adsorption reported by Belton et al is akin to the morphological effect on the heat of adsorption demonstrated by Resasco et aZ. 32 for benzene on Pt small particles. Vannice et aZ.…”