Chromium catalysts stabilized by alkylphosphanyl PNP ligands for selective ethylene tri-/tetramerization

2021 ◽  
Author(s):  
Fakhre Alam ◽  
Haonan Fan ◽  
Chunhua Dong ◽  
Jingyi Zhang ◽  
Jing Ma ◽  
...  
Keyword(s):  
Chromium Catalysts

scholarly journals Comparison of Support Effects on Phillips and Metallocene Catalysts

Catalysts ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 842
Author(s):  
Qing Yang ◽  
Max Paul McDaniel
Keyword(s):  
High Activity ◽  
Chromium Oxide ◽  
Solid Acid ◽  
Metallocene Catalysts ◽  
Solid Oxides ◽  
Support Effects ◽  
Phillips Catalyst ◽  
Chromium Catalysts ◽  
Catalyst Systems

Both metallocene and Phillips chromium catalysts are used in the commercial manufacture of polyethylene. Unlike most other commercial metallocene systems, the Chevron Phillips Chemical (CPC) platform does not use methylaluminoxane or fluoroorganic boranes. Instead, the support itself serves to activate (ionize) the metallocenes, which then polymerize ethylene at high activity. Most of these solid acid supports can also be used to anchor Cr to make a Phillips catalyst. This provides an interesting opportunity to compare the polymerization responses by these two disparate systems, Phillips Cr and CPC metallocene, when supported on the same solid acid carriers. In this study, both chromium oxide and several metallocenes were deposited onto a variety of solid oxides, under a variety of conditions, and the resulting support effects were observed and compared. Although using seemingly different chemistries, the two catalyst systems exhibited a surprising number of similarities, which can be attributed to the acidity and porosity of these diverse supports.

ChemInform Abstract: New Supported Palladium-Chromium Catalysts: Characterization and Catalytic Properties.

ChemInform ◽  
2010 ◽  
Vol 22 (23) ◽  
pp. no-no
Author(s):  
A. BORGNA ◽  
B. MORAWECK ◽  
J. MASSARDIER ◽  
A. J. RENOUPREZ
Keyword(s):  
Catalytic Properties ◽  
Supported Palladium ◽  
Chromium Catalysts

Ethylene polymerization by new chromium catalysts based on carborane [SSO] ligands

2013 ◽  
Vol 42 (25) ◽  
pp. 9089 ◽  
Author(s):  
Ping Hu ◽  
Ya-Lin Qiao ◽  
Zhen-Hua Li ◽  
Jian-Qiang Wang ◽  
Guo-Xin Jin
Keyword(s):  
Ethylene Polymerization ◽  
Chromium Catalysts

Acidity of reduced aluminum-chromium catalysts

1973 ◽  
Vol 22 (6) ◽  
pp. 1284-1286
Author(s):  
O. D. Sterligov ◽  
S. A. Ponomareva ◽  
V. N. Medvedev
Keyword(s):  
Chromium Catalysts

Hysteresis during CO-oxidation activity measurements on carbon-supported copper/chromium catalysts

2010 ◽  
Vol 109 (2) ◽  
pp. 112-116 ◽  
Author(s):  
S. Stegenga ◽  
N. J. J. Dekker ◽  
R. van Soest ◽  
F. Kapteijn ◽  
J. A. Moulijn
Keyword(s):  
Co Oxidation ◽  
Oxidation Activity ◽  
Activity Measurements ◽  
Copper Chromium ◽  
Chromium Catalysts
Sign in / Sign up

Export Citation Format

Share Document