Strong activation of MgCl2 -supported Ziegler-Natta catalysts by treatments with BCl3 : Evidence and application of the “cluster” model of active sites

2009 ◽  
Vol 47 (21) ◽  
pp. 5784-5791 ◽  
Author(s):  
David Ribour ◽  
Vincent Monteil ◽  
Roger Spitz
Keyword(s):  
Cluster Model ◽  
Active Sites ◽  
Ziegler Natta Catalysts

Nonlinear Vibrations in a 2-Dimensional Protein Cluster Model with Linear Bonds

2000 ◽  
Vol 214 (1) ◽  
Author(s):  
E.G. Shidlovskaya ◽  
L. Schimansky-Geier ◽  
Yu.M. Romanovsky
Keyword(s):  
Active Site ◽  
Internal Resonance ◽  
Cluster Model ◽  
Active Sites ◽  
Nonlinear Vibrations ◽  
Nonlinear Phenomena ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Two Dimensional Model

A two dimensional model for the substrate inside a pocket of an active site of an enzyme is presented and investigated as a vibrational system. The parameters of the system are evaluated for α-chymotrypsin. In the case of internal resonance it is analytically and numerically shown that the energy concentrated on a certain degree of freedom might be several times larger than in the non-resonant case. Additionally, the system is driven by harmonic excitations and again energy due to nonlinear phenomena is redistributed inhomogeneously. These results may be of importance for the determination of the rates of catalytic events of substrates bound in pockets of active sites.

Energy Distribution of Active Sites in Heterogeneous Ziegler-Natta Catalysts. Method of Study of Active Site Non-Uniformity

1999 ◽  
pp. 89-96 ◽  
Author(s):  
L. A. Novokshonova ◽  
N. Yu Kovaleva ◽  
Yu A. Gavrilov ◽  
V. G. Krasheninnikov ◽  
T. A. Ladygin ◽  
...  
Keyword(s):  
Energy Distribution ◽  
Active Site ◽  
Active Sites ◽  
Ziegler Natta Catalysts

Study of energy distribution of active sites in heterogeneous Ziegler-Natta catalysts

1997 ◽  
Vol 39 (1) ◽  
pp. 59-65 ◽  
Author(s):  
Lyudmila A. Novokshonova ◽  
Natalia Yu. Kovaleva ◽  
Yurii A. Gavrilov ◽  
Vadim G. Krasheninnikov ◽  
Ilia O. Leipunskii ◽  
...  
Keyword(s):  
Energy Distribution ◽  
Active Sites ◽  
Ziegler Natta Catalysts

Precise arguments on the distribution of stereospecific active sites on MgCl2-supported ziegler-natta catalysts

2004 ◽  
Vol 213 (1) ◽  
pp. 7-18 ◽  
Author(s):  
Boping Liu ◽  
Takashi Nitta ◽  
Hisayuki Nakatani ◽  
Minoru Terano
Keyword(s):  
Active Sites ◽  
Ziegler Natta Catalysts

New Evidence on the Nature of the Active Sites in Heterogeneous Ziegler−Natta Catalysts for Propene Polymerization

1997 ◽  
Vol 30 (16) ◽  
pp. 4786-4790 ◽  
Author(s):  
Vincenzo Busico ◽  
Roberta Cipullo ◽  
Giovanni Talarico ◽  
Anna Laura Segre ◽  
John C. Chadwick
Keyword(s):  
Active Sites ◽  
Propene Polymerization ◽  
New Evidence ◽  
Ziegler Natta Catalysts
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