Onium chains-silica as catalytic support: Application to hydroformylation

Journal Article · Wed Sep 01 04:00:00 EDT 1993 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1006/jcat.1993.1253· OSTI ID:5772385

Hong, L; Ruckenstein, E ^[1]

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1. State Univ. of New York, Buffalo, NY (United States)

Polymer chains of quaternary oniums are deposited on the surface of hydrophilic silica by the radical polymerization of water-soluble quaternary onium monomers present in a water medium which imbibes the porous silica. The modified (quaternized) silica surface which contains a small amount of water is a more suitable support than silica, since it provides anchors for the catalytic species and sites for the adsorption of reactant molecules. It is used as substrate for the immobilization of monosulfonated triphenylphosphine (DPM) and of its rhodium carbonyl complex Cl(CO)Rh(DPM)[sub 2], through an ion-exchange process. The immobilized catalytic system containing a small amount of water was employed in the hydroformylation of styrene and ethyl 10-undecenoate. The presence of ethanol in the reaction medium is necessary to achieve a high yield of aldehydes. For styrene, the ratio of the isomer to the normal aldehyde is greater than 6, while for ethyl 10-undecenoate, it is 1/8. Structural factors that affect the regioselectivities of the aldehydes are suggested as possible explanations for the above ratios. The performance of the catalyst has remained almost unchanged during several reuses. 23 refs., 6 figs., 4 tabs.

• OSTI ID: 5772385
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 143:1; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALDEHYDES
ALKYLATED AROMATICS
AROMATICS
CARBONYLATION
CATALYSIS
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
COMPLEXES
DEPOSITION
ESTERS
HETEROGENEOUS CATALYSIS
HYDROCARBONS
ION EXCHANGE
MINERALS
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHOSPHINES
PHOSPHORUS COMPOUNDS
POLYMERIZATION
RADICALS
RHODIUM COMPLEXES
SILICA
SILICON COMPOUNDS
SILICON OXIDES
STYRENE
SYNTHESIS
TRANSITION ELEMENT COMPLEXES
YIELDS