Transformation of carbon compounds on graphimet catalysts. Part V. The effect of pretreatment on the structure and activity of Pt-graphimet catalyst

✍ Scribed by Ágnes Mastalir; Ferenc Notheisz; Mihály Bartók; Zoltán Király; Imre Dékány

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 686 KB
• Volume: 99
• Category: Article
• ISSN: 1381-1169
• DOI: 10.1016/1381-1169(95)00044-5

✦ Synopsis

The effect of medium-temperature reduction (MTR, 573 K) on the structure and catalytic activity of Pt-graphimet was studied by transmission electron microscopy, small angle X-ray scattering, 0,-H, titration and sorption microcalorimetry. The test reaction was the hydrogenation of cyclohexene. MTR resulted in the migration of interlayer platinum atoms to the catalyst surface, leading to metal aggregation and the formation of additional inserted active sites responsible for increased O2 and H2 adsorption. The decrease in catalytic activity observed upon MTR is attributed to the encapsulation of small surface particles inside the graphite 'host'.