scholarly journals Polymerization Catalyst of the Triethylaluminum-Chloral Hydrate System. I. Triethylaluminum-Chloral Hydrate Reaction and Catalyst Activity in Cationic Polymerization

1968 ◽  
Vol 41 (5) ◽  
pp. 1188-1191 ◽  
Author(s):  
Takeo Saegusa ◽  
Hiroyasu Fujii ◽  
Takashi Ueshima ◽  
Katsumi Tanaka
Keyword(s):  
Cationic Polymerization ◽  
Chloral Hydrate ◽  
Catalyst Activity ◽  
Polymerization Catalyst

scholarly journals Complexes of aluminum, iron(III), and gallium(III) chlorides with ethers in synthesis of highly reactive polyisobutylene

2020 ◽  
pp. 50-62
Author(s):  
Sergei V. Kostjuk
Keyword(s):  
Cationic Polymerization ◽  
Lewis Acids ◽  
Catalyst Activity ◽  
Steric Structure ◽  
Motor Oil ◽  
Hydrocarbon Solvents ◽  
Computational Data ◽  
Aluminum Iron ◽  
Highly Reactive Polyisobutylene ◽  
Ether Complex

In this review, the latest achievements in the field of cationic polymerization of isobutylene catalyzed by the complexes of conventional Lewis acids with ethers are presented. The experimental and computational data on the influence of steric structure and basicity of ether used for the preparation of the Lewis acid-ether complex on the catalyst activity and regioselectivity of β-H abstraction are discussed here. Complexes of metal halides with linear (Bu2O) and moderately branched (iPr2O) ethers of moderate basicity (pKa from –4.3 to –5.4) displayed the highest activity and regioselectivity in the cationic polymerization of isobutylene affording highly reactive polyisobutylene (HR PIB) – the key intermediate in the preparation of motor oil and fuel additives. The review is also focusing on the adaptation of the developed catalytic system to the industry, which consists in using non-polar hydrocarbon solvents, high temperatures and monomer concentrations.

scholarly journals Aluminum Silanolates Acid Strength and Polymerization Catalyst Activity

1968 ◽  
Vol 41 (7) ◽  
pp. 1694-1696 ◽  
Author(s):  
Takeo Saegusa ◽  
Takashi Ueshima ◽  
Kunioki Kato
Keyword(s):  
Catalyst Activity ◽  
Acid Strength ◽  
Polymerization Catalyst

Epoxy-titania composites of cationic polymerization: synthesis conditions and properties

2015 ◽  
Vol 37 (4) ◽  
pp. 402-407
Author(s):  
S.V. Zhil’tsova ◽  
◽  
V.M. Mikhal’chuk ◽  
N.G. Leonova ◽  
R.I. Lyga ◽  
...  
Keyword(s):  
Cationic Polymerization ◽  
Synthesis Conditions

Preparation and Evaluation of Skeletal Cobalt-Molybdenum Hydrodesulfurization Catalysts

1995 ◽  
Vol 60 (4) ◽  
pp. 568-575
Author(s):  
Karel Sporka ◽  
Jiří Hanika ◽  
Vladimír Jůn
Keyword(s):  
Aqueous Solutions ◽  
Active Component ◽  
Catalyst Activity ◽  
Gas Oil ◽  
Gamma Alumina ◽  
Molybdenum Sulfides ◽  
Hydrodesulfurization Catalysts ◽  
Hds Catalysts ◽  
Kinetics Of ◽  
Preparation And Evaluation

Preparation of skeletal Co-Mo catalysts by controlled impregnation of aluminosilicate skeletons containing deposited gamma-alumina with aqueous solutions of active component precursors has been investigated. The activity of the laboratory catalysts in gas oil hydrodesulfurization has been determined. Kinetics of impregnation of skeletal supports, the effect of their type, and the dependence of catalyst activity on the content of cobalt and molybdenum sulfides are reported. HDS skeletal catalysts prepared were compared with the extruded types. It was found that skeletal HDS catalysts show the higher activity (related to the content of alumina and Co-Mo sulfides) than the extruded ones due to the less significant effect of internal diffusion. However, if the activity is related to the same volume of catalyst bed, the activity of skeletal catalysts is only one fourth of that of the extruded types.

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