KFUPM ePrints

Catalytic hydroformylation of alkenes and polyalkenes: a novel approaches to catalyst synthesis, characterization and recycling

Tijan, Jimoh (2006) Catalytic hydroformylation of alkenes and polyalkenes: a novel approaches to catalyst synthesis, characterization and recycling. PhD thesis, King Fahd University of Petroleum and Minerals.

[img]PDF
4Mb

Arabic Abstract

-

English Abstract

Hydroformylation of olefins is a versatile method and well-established industrial process for the production of aldehydes using transition metal complexes as homogeneous catalysts. Currently, worldwide production of aldehydes exceeded seven million tons/year. Rhodium (I) complexes are the most active and selective catalysts for hydroformylation reaction. For any industrial application of homogeneously catalyzed reaction, a complete recycling of the generally expensive catalyst should be guaranteed. A thermomorphic system is characterized by solvent pairs that reversibly changes from biphasic to monophasic and vice versa as a function of temperature. We have applied the thermomorphic approach to rhodium-catalyzed hydroformylation of higher olefins (C>6). The effect of CO/H₂ pressure, ligand/catalyst ratio on activity, selectivity and recycling were studied on 1-octene and other olefins. The impregnation of HRhCO(PPh₃)₃ on mesoporous materials such as MCM-41, through Phosphotungstic acid (PTA) gives a novel hydroformylation catalyst, which was characterized by XRD, IR, and ³¹P CP MAS NMR. The activity, selectivity and recycling of this supported catalyst were established by hydroformylation of 1-octene. The catalyst activity was shown by the recycling capability for several times without significant loss of activity. Results are presented on a novel application of catalysis to chemical modification of commercially available polybutadiene polymers. The functionalized polyaldehyde products are key intermediates in the development of various polymer derivatives which form the basis for various novel material and component applications, such as manufacture of automobile body components by reaction injection molding processing. Characterization of the reaction products using ¹³C and ¹H NMR shows that the olefin units in the polybutadiene are selectively hydroformylated to the 1, 2-terminal branched and 1, 4-internal branched aldehydes products.



Item Type:Thesis (PhD)
Date:May 2006
Date Type:Completion
Subjects:Chemistry
Divisions:College Of Sciences > Chemistry Dept
Creators:Tijan, Jimoh
Committee Advisor:El Ali, Bassam
Committee Members:Ali, Shaikh Asrof and Fettouhi, M. B. and Abu-Sharkh, Basel F. and Al-Arfaj, Abdul-Rahman A.
ID Code:10480
Deposited By:KFUPM ePrints Admin
Deposited On:22 Jun 2008 17:05
Last Modified:30 Apr 2011 15:36

Repository Staff Only: item control page