Immobilized transition-metal carbonyls and related catalysts

Bailey, David C.; Langer, Stanley H.

doi:10.1021/cr00042a001

Cited by 456 publications

(130 citation statements)

References 72 publications

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“…They tions. [1][2][3] Several such catalysts have been develwere (i) 2-hydroxy ethylmethacrylate (HEMA), (ii) oped using phosphinated polystyrene as support 2,3-epoxypropyl methacrylate (GMA), (iii) 4-vinylpyrmatrix. [4][5][6] Polymer supports with nitrogen conidine (4-VP), (iv) N-vinylpyrrolidinone (N-VP), (v) taining ligands have also been studied as supports methyl methacrylate (MMA), (vi) N,N-dimethylamibecause of their stability to oxidation.…”

Section: Introduction Experimentalmentioning

confidence: 99%

Polymer-supported palladium and rhodium species as hydrogenation catalysts

Selvaraj¹,

Mahadevan²

1997

J. Polym. Sci. A Polym. Chem.

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Section: Introduction Experimentalmentioning

confidence: 99%

Polymer-supported palladium and rhodium species as hydrogenation catalysts

Selvaraj¹,

Mahadevan²

1997

J. Polym. Sci. A Polym. Chem.

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“…When NaOH was added to the calcined RuCl3/ Al2O3, the conversion of DBT decreased (run 6). When Ru3(CO)12 and/or NaOH were supported on alumina in sequence, no significant increase in the catalytic activity was observed (runs 7,8). This suggests that the location of the sodium close to the ruthenium species by the presulriding of Na[HRu3(CO)11] supported on alumina may be intrinsic to the high catalytic activity.…”

Section: Catalysts For Hydrodesulfurizationmentioning

confidence: 99%

Hydrodesulfurization of Dibenzothiophene Catalyzed by Supported Metal Carbonyl Complexes.

2001

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Hydrodesulfurization(HDS) of dibenzothiophene (DBT) catalyzed by supported anionic molybdenum and ruthenium carbonyl complexes is described, specifically the catalytic activity and the product selectivity. A Mo(CO)6-NEt3-EtSH/Al2O3 system activated by H2 or H2S shows the highest catalytic activity among catalysts derived from supported-metal carbonyls and conventional molybdena-alumina.Investigation of the effects of supports found the yields of HDS products decreased in the order, SiO2-Al2O3>Al2O3>TiO2=Active carbon> SiO2>NaY zeolite=HZSM-5>HYzeolite. The effects of addition of alkali metal hydroxide on the catalytic activity and product selectivity of sulfided alumina-supported ruthenium carbonyls in HDS of DBT were described.Addition of an alkali metal hydroxide to catalysts derived from alumina-supported Ru3(CO)12 remarkably increased the conversion of DBT. The Ru3(CO)12 must be supported on alumina so that the reaction with the alkali metal hydroxide will form an anionic ruthenium hydride complex [HRu3(CO)11]-, which is essential to obtain the high catalytic activity. Cesium was the most effective of the alkali metals.The conversion of DBT reaches the maximum at Cs/Ru=2. Further addition of cesium decreased the activity. Biphenyl was produced selectively in this system.The involvement of cesium was elucidated by tracing the behavior of 35S on the alumina-supported ruthenium carbonyls-cesium hydroxide systems in HDS of [35S]DBT. The amount of labile sulfur was estimated from the amount of 35S accommodated on the catalyst. The rate constant of [35S]H2S release was estimated from the first order plot of the decreasing radioactivity of product [35S]H2S. The results obtained indicated that the dispersion of ruthenium species was significantly high. Cesium probably promotes the C-S bond scission of DBT and increases the activity by stabilizing the Ru-S bonds of ruthenium sulfide.

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“…Dentre as principais aplicações, destaca-se seu uso como fase estacionária em cromatografia [1][2][3][4][5] , como catalisadores suportados 6 , em pré-concentração de íons metálicos 7-10 , imobilização de enzimas 11 , nas modificações de superfícies de eletrodos [12][13] e em outras aplicações. Agentes quelantes tais como ferroína 14 , ditizona [15][16] , 8-hidroxiquinoleína [17][18][19][20][21][22][23][24][25][26][27][28][29] , dimetilglioxima 30 , alquilaminas, diaminas, xantatos, ditiocarbamatos [31][32][33][34] e ácido propilenodiaminotetracético 35 , têm sido imobilizados em vários substratos com subseqüente utilização na pré-concentração de traços de metais de soluções aquosas.…”

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