An estimation of the fraction of Cr-II sites involved in the C2H4 polymerization on a Cr-II/SiO2 Phillips catalyst has been obtained by means of in situ alternated CO adsorption and C2H4 polymerization FTIR experiments: about 28% of the total surface sites react fast with C2H4, while a lower fraction, which depends upon the temperature reaction conditions, is more slowly involved, in agreement with XANES results.

On the fraction of CrII sites involved in the C2H4 polymerization on the Cr/SiO2 Phillips catalyst: a quantification by FTIR spectroscopy

GROPPO, Elena Clara;LAMBERTI, Carlo;CESANO, Federico;ZECCHINA, Adriano
2006-01-01

Abstract

An estimation of the fraction of Cr-II sites involved in the C2H4 polymerization on a Cr-II/SiO2 Phillips catalyst has been obtained by means of in situ alternated CO adsorption and C2H4 polymerization FTIR experiments: about 28% of the total surface sites react fast with C2H4, while a lower fraction, which depends upon the temperature reaction conditions, is more slowly involved, in agreement with XANES results.
2006
8
2453
2456
http://www.rsc.org/publishing/journals/CP/article.asp?doi=b604515d
SUPPORTED CHROMIUM CATALYSTS; DIFFUSE-REFLECTANCE SPECTROSCOPY; ETHYLENE POLYMERIZATION; OLEFIN POLYMERIZATION; OXIDATION-STATES; CR(II) SITES; SILICA
GROPPO E; LAMBERTI C; CESANO F; ZECCHINA A
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1639
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