On the fraction of CrII sites involved in the C2H4 polymerization on the Cr/SiO2 Phillips catalyst: a quantification by FTIR spectroscopy.
An estimation of the fraction of Cr(II) sites involved in the C(2)H(4) polymerization on a Cr(II)/SiO(2) Phillips catalyst has been obtained by means of in situ alternated CO adsorption and C(2)H(4) polymerization FTIR experiments: about 28% of the total surface sites react fast with C(2)H(4), while a lower fraction, which depends upon the temperature reaction conditions, is more slowly involved, in agreement with XANES results.
Groppo
E
E
Department of Inorganic, Physical and Materials Chemistry, INSTM centro di riferimento and NIS Centre of Excellence, University of Turin, Torino, Italy. elena.groppo@unito.it
Lamberti
C
C
Cesano
F
F
Zecchina
A
A