Concepedia

Dichloromethane as a Selective Modifying Agent To Create a Family of Highly Reactive Chromium Polymerization Sites

Cristina N. Nenu, Elena Groppo, Carlo Lamberti, Andrew M. Beale, Tom Visser, Adriano Zecchina, Bert M. Weckhuysen

Angewandte Chemie International Edition · 2007 · 26 citations · 17 references

DOIFull text

Open access

Concepts

Abstract

Uniform polymerization sites with high activity can be created by treating a Phillips-type CrII/SiO2 catalyst with CH2Cl2 (as shown schematically in the picture) under well-defined conditions. A mechanism is proposed in which CH2Cl2 increases the catalytic activity of a small fraction of Cr sites while poisoning the remainder.

References

17

The Ethylene Polymerization with Ziegler Catalysts: Fifty Years after the Discovery

Ludwig Böhm · Angewandte Chemie International Edition · 2003 · 328 citations

, , +15

Combined DRS–RS–EXAFS–XANES–TPR study of supported chromium catalysts

Bert M. Weckhuysen, Robert A. Schoonheydt, Jih‐Mirn Jehng et al. · Journal of the Chemical Society Faraday Transactions · 1995 · 198 citations · Full text

, , +16

In situ, Cr K-edge XAS study on the Phillips catalyst: activation and ethylene polymerization

Elena Groppo, Carmelo Prestipino, Federico Cesano et al. · Journal of Catalysis · 2004 · 109 citations

, , +9

Heterogeneous Nonclassical Carbonyls Stabilized in Cu(I)− and Ag(I)−ZSM-5 Zeolites:  Thermodynamic and Spectroscopic Features

Vera Bolis, A. Barbaglia, Silvia Bordiga et al. · The Journal of Physical Chemistry B · 2004 · 94 citations

, , +14

In situ FTIR spectroscopy of key intermediates in the first stages of ethylene polymerization on the Cr/SiO2 Phillips catalyst: Solving the puzzle of the initiation mechanism?

Elena Groppo, Carlo Lamberti, Silvia Bordiga et al. · Journal of Catalysis · 2006 · 86 citations

, , +12