Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9614535 | Journal of Molecular Catalysis A: Chemical | 2005 | 9 Pages |
Abstract
Correlation of oxidation states of surface Cr species on TEA-modified Phillips catalysts with their ethylene polymerization activity in terms of catalyst calcination temperature and Al/Cr molar ratio suggested that the real active Cr precursor might be a Cr2+·2Cr6+ cluster (Scheme 1). Based on this plausible cluster model, the active sites concentration is estimated to be around 14.4-24.9 (mol% Cr) for the TEA-modified Phillips catalysts.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Catalysis
Authors
Boping Liu, Pavel Å indeláÅ, Yuwei Fang, Kouichi Hasebe, Minoru Terano,