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Immobilized palladium nanoparticles catalyzed oxidative carbonylation of amines / Mahesh R. Didgikar in Industrial & engineering chemistry research, Vol. 49 N° 3 (Fevrier 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 3 (Fevrier 2010) . - pp. 1027–1032 Titre : Immobilized palladium nanoparticles catalyzed oxidative carbonylation of amines Type de document : texte imprimé Auteurs : Mahesh R. Didgikar, Auteur ; Debdut Roy, Auteur ; Sunil P. Gupte, Auteur Année de publication : 2010 Article en page(s) : pp. 1027–1032 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Immobilized--Palladium--Nanoparticles--  Catalyzed--Oxidative--Carbonylation--Amines Résumé : Catalytic application of immobilized palladium nanoparticles for synthesis of ureas by oxidative carbonylation of amines has been investigated. This is the first report on oxidative carbonylation of amines to ureas using immobilized palladium nanoparticles catalyst. The palladium nanoparticles were immobilized on a NaY zeolite support through 3-aminopropyl-trimethoxysilane (APTS) as anchoring agent. The [Pd]-APTS-Y catalyst along with NaI promoter showed high conversion and selectivity to the desired urea products over several amine compounds including an example of an aliphatic amine precursor even at 333 K. The immobilized catalyst was easily separated and recycled several times without any loss of activity. The role of different solvents, iodide promoters, iodide to Pd ratio, concentration of substrates, and temperature on the overall yield of the reaction was also investigated. Note de contenu : Bibiogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9007024 [article] Immobilized palladium nanoparticles catalyzed oxidative carbonylation of amines [texte imprimé] / Mahesh R. Didgikar, Auteur ; Debdut Roy, Auteur ; Sunil P. Gupte, Auteur . - 2010 . - pp. 1027–1032. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 3 (Fevrier 2010) . - pp. 1027–1032 Mots-clés : Immobilized--Palladium--Nanoparticles--  Catalyzed--Oxidative--Carbonylation--Amines Résumé : Catalytic application of immobilized palladium nanoparticles for synthesis of ureas by oxidative carbonylation of amines has been investigated. This is the first report on oxidative carbonylation of amines to ureas using immobilized palladium nanoparticles catalyst. The palladium nanoparticles were immobilized on a NaY zeolite support through 3-aminopropyl-trimethoxysilane (APTS) as anchoring agent. The [Pd]-APTS-Y catalyst along with NaI promoter showed high conversion and selectivity to the desired urea products over several amine compounds including an example of an aliphatic amine precursor even at 333 K. The immobilized catalyst was easily separated and recycled several times without any loss of activity. The role of different solvents, iodide promoters, iodide to Pd ratio, concentration of substrates, and temperature on the overall yield of the reaction was also investigated. Note de contenu : Bibiogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9007024

Kinetic modeling of aqueous - phase glycerol hydrogenolysis in a batch slurry reactor / Arely Torres in Industrial & engineering chemistry research, Vol. 49 N° 21 (Novembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 21 (Novembre 2010) . - pp. 10826-10835 Titre : Kinetic modeling of aqueous - phase glycerol hydrogenolysis in a batch slurry reactor Type de document : texte imprimé Auteurs : Arely Torres, Auteur ; Debdut Roy, Auteur ; Bala Subramaniam, Auteur Année de publication : 2011 Article en page(s) : pp. 10826-10835 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Modeling  Particle  suspension  Reactor  Batchwise  Hydrogenolysis  Kinetic  model Résumé : The kinetics of the aqueous-phase hydrogenolysis of glycerol to 1,2-propanediol (1,2-PDO) was studied using a bimetallic Ru―Re/C catalyst in a slurry reactor in a temperature range of 493-513 K and a hydrogen pressure of 2.4-9.6 MPa. Glycerol hydrogenolysis to produce 1,2-PDO via C―O cleavage (i) proceeds with parallel C—C cleavage, reforming, water-gas shift, and Fischer-Tropsch reactions, (ii) results in a very complex reaction network with several gaseous- and liquid-phase products, and (iii) poses a challenge to design selective catalysts. It is observed that Ru―Re bimetallic catalyst shows higher hydrogenolysis activity (glycerol conversion of X = 57.7%) and 1,2-PDO selectivity (S = 36.6%), compared to the monometallic Ru catalyst (X = 52.1%; S = 18.9%) but the monometallic Re catalyst showed no catalytic activity for the reaction. Stirred-batch reactor data on the transient concentrations of reactants and products in both the gas and liquid phases were obtained using a bimetallic Ru-Re/C catalyst under different conditions to understand the reaction pathways, selectivity behavior, and intrinsic kinetics of the different reaction steps. For kinetic modeling, several experiments were performed at different initial pressures of hydrogen, catalyst concentration, and temperatures. The proposed rate equations, along with the regressed kinetic and activation energy parameters, were found to represent the experimental data for the multistep hydrogenolysis reaction very satisfactorily. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23447975 [article] Kinetic modeling of aqueous - phase glycerol hydrogenolysis in a batch slurry reactor [texte imprimé] / Arely Torres, Auteur ; Debdut Roy, Auteur ; Bala Subramaniam, Auteur . - 2011 . - pp. 10826-10835. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 21 (Novembre 2010) . - pp. 10826-10835 Mots-clés : Modeling  Particle  suspension  Reactor  Batchwise  Hydrogenolysis  Kinetic  model Résumé : The kinetics of the aqueous-phase hydrogenolysis of glycerol to 1,2-propanediol (1,2-PDO) was studied using a bimetallic Ru―Re/C catalyst in a slurry reactor in a temperature range of 493-513 K and a hydrogen pressure of 2.4-9.6 MPa. Glycerol hydrogenolysis to produce 1,2-PDO via C―O cleavage (i) proceeds with parallel C—C cleavage, reforming, water-gas shift, and Fischer-Tropsch reactions, (ii) results in a very complex reaction network with several gaseous- and liquid-phase products, and (iii) poses a challenge to design selective catalysts. It is observed that Ru―Re bimetallic catalyst shows higher hydrogenolysis activity (glycerol conversion of X = 57.7%) and 1,2-PDO selectivity (S = 36.6%), compared to the monometallic Ru catalyst (X = 52.1%; S = 18.9%) but the monometallic Re catalyst showed no catalytic activity for the reaction. Stirred-batch reactor data on the transient concentrations of reactants and products in both the gas and liquid phases were obtained using a bimetallic Ru-Re/C catalyst under different conditions to understand the reaction pathways, selectivity behavior, and intrinsic kinetics of the different reaction steps. For kinetic modeling, several experiments were performed at different initial pressures of hydrogen, catalyst concentration, and temperatures. The proposed rate equations, along with the regressed kinetic and activation energy parameters, were found to represent the experimental data for the multistep hydrogenolysis reaction very satisfactorily. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23447975