Acidity of reduced aluminum-chromium catalysts

Author(s):  
O. D. Sterligov ◽  
S. A. Ponomareva ◽  
V. N. Medvedev
Keyword(s):  
Catalysts ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 842
Author(s):  
Qing Yang ◽  
Max Paul McDaniel

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 ◽  
2010 ◽  
Vol 22 (23) ◽  
pp. no-no
Author(s):  
A. BORGNA ◽  
B. MORAWECK ◽  
J. MASSARDIER ◽  
A. J. RENOUPREZ

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

2010 ◽  
Vol 109 (2) ◽  
pp. 112-116 ◽  
Author(s):  
S. Stegenga ◽  
N. J. J. Dekker ◽  
R. van Soest ◽  
F. Kapteijn ◽  
J. A. Moulijn

2008 ◽  
Vol 120 (31) ◽  
pp. 5900-5903 ◽  
Author(s):  
Khalid Albahily ◽  
Ece Koç ◽  
Danya Al‐Baldawi ◽  
Didier Savard ◽  
Sandro Gambarotta ◽  
...  

Sign in / Sign up

Export Citation Format

Share Document