Ethylene, propylene and ethylene oxide in situ polymerization on the Cr(II)/SiO2 system:: A temperature- and pressure-dependent investigation

被引:28
作者
Groppo, E.
Estephane, J.
Lamberti, C.
Spoto, G.
Zecchina, A.
机构
[1] Univ Turin, Dept Inorgan Phys & Mat Chem, INSTM UdR Torino, I-10125 Turin, Italy
[2] Univ Turin, NIS, Ctr Excellence, I-10125 Turin, Italy
[3] CNRS, CPE Lyon, UMR 9986, Lab Chim Organomet Surface, F-69616 Villeurbanne, France
关键词
polymerization; in-situ FTIR spectroscopy; Phillips catalyst;
D O I
10.1016/j.cattod.2007.01.052
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
The Cr(II)/SiO2 system was found to be able to activate and polymerize at room temperature not only light olefins (such as ethylene and propylene), but also a cyclic molecule such as ethylene oxide, which does not contain a C-C unsaturation. The polymerization of ethylene, propylene and ethylene oxide on the Cr(II)/SiO2 system have been followed in situ by means of temperature-and pressure-resolved FTIR spectroscopy. This method allowed to "freeze" the precursors of the reaction and the intermediate species, even when their amount is low in comparison with spectator species, and in some cases to determine the initiation mechanism. Information about the energy barrier associated with the polymerization reaction (temperature at which the reaction starts) and about the kinetic of the process (time dependence of the experiment) have been obtained in the three cases. (c) 2007 Published by Elsevier B.V.
引用
收藏
页码:228 / 234
页数:7
相关论文
共 28 条
[1]   A DRIFTS study of the Cr(II)/SiO2 catalyst -: Ethylene coordination and early stages of polymerisation [J].
Bade, OM ;
Blom, R ;
Dahl, IM ;
Karlsson, A .
JOURNAL OF CATALYSIS, 1998, 173 (02) :460-469
[2]  
Bailey F.E., 1976, Poly(Ethylene Oxide)
[3]   COMPARISON OF ETHYLENE-OXIDE AND PROPYLENE-OXIDE CHEMISORBED ON CLEAN AND OXYGEN PRECOVERED AG(110) [J].
BARE, SR .
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS, 1992, 10 (04) :2336-2342
[4]   On the first stages of the ethylene polymerization on Cr2+/SiO2 Phillips catalyst:: time and temperature resolved IR studies [J].
Bordiga, S ;
Bertarione, S ;
Damin, A ;
Prestipino, C ;
Spoto, G ;
Lamberti, C ;
Zecchina, A .
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL, 2003, 204 :527-534
[5]   THE ADSORPTION OF ETHYLENE-OXIDE ON AG(110) AND PT(111) - RELEVANCE TO SELECTIVE OLEFIN OXIDATION [J].
CAMPBELL, CT ;
PAFFETT, MT .
SURFACE SCIENCE, 1986, 177 (02) :417-430
[6]  
EBERT PE, 1960, J POLYM SCI, P455
[7]   IR INVESTIGATION OF POLYMERIZATION CENTERS OF THE PHILLIPS CATALYST [J].
GHIOTTI, G ;
GARRONE, E ;
ZECCHINA, A .
JOURNAL OF MOLECULAR CATALYSIS, 1988, 46 (1-3) :61-77
[8]   On the fraction of CrII sites involved in the C2H4 polymerization on the Cr/SiO2 Phillips catalyst:: a quantification by FTIR spectroscopy [J].
Groppo, E ;
Lamberti, C ;
Cesano, F ;
Zecchina, A .
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 2006, 8 (21) :2453-2456
[9]   Tuning the structure, distribution and reactivity of polymerization centres of Cr(II)/SiO2 Phillips catalyst by controlled annealing [J].
Groppo, E ;
Lamberti, C ;
Spoto, G ;
Bordiga, S ;
Magnacca, G ;
Zecchina, A .
JOURNAL OF CATALYSIS, 2005, 236 (02) :233-244
[10]   FTIR investigation of the H2, N2, and C2H4 molecular complexes formed on the Cr(II) sites in the Phillips catalyst:: A preliminary step in the understanding of a complex system [J].
Groppo, E ;
Lamberti, C ;
Bordiga, S ;
Spoto, G ;
Damin, A ;
Zecchina, A .
JOURNAL OF PHYSICAL CHEMISTRY B, 2005, 109 (31) :15024-15031