Showing papers in "Journal of Molecular Catalysis in 1991"

TL;DR: In this paper, the characteristics of the adsorption and reactions of CO 2 on Rh, Pd, Pt, Ni, Fe, Cu, Re, Al, Mg and Ag metals are discussed with particular emphasis on the activation of the CO 2 molecule.

TL;DR: In this article, an electron transfer between ruthenium and sulfur is proposed to explain the presence of such hydroxyl groups at the surface of sulfurized rutsium, which leads to deactivation of both hydrogenation and hydrogenolysis reactions.

TL;DR: In this paper, the effect of several organic acids and bases used as solvents and additives for the enantioselective hydrogenation of α-ketoesters with cinchona-modified platinum catalyst is described.

TL;DR: Titano-Silicalite 1 (TS-1) has been used as a catalyst for the hydroxylation of phenol with hydrogen peroxide as mentioned in this paper, which was carried out in different organic solvents in order to investigate the solvent effect and its influence on the product distribution during the oxidation.

TL;DR: In this article, the authors investigated the effect of metal particle size on the hydrogenation of unsaturated aldehydes and found that the specific activity expressed per Ru surface atom remains constant with metal dispersion, indicating that the rate determining step of the reaction is structure-insensitive.

TL;DR: In this article, eight classes of transesterification catalysts are identified for the cogeneration of ethylene glycol plus dimethyl carbonate from ethylene carbonate and methanol.

TL;DR: In this paper, a rate law was proposed for hydrogenation of p-chloronitrobenzene (CNB) in methanol suspension at 303 K and atmospheric pressure, over a series of Pt/Al2O3 catalysts of varying dispersion.

TL;DR: In this article, tris(2-pyridyl)phosphine was used for biphasic hydrofomylation of tetradec-1-ene with octane-1,2-sultone as the complex ligand.

TL;DR: The authors showed that unsaturated intermediates resulting from dehydrogenation are irreversibly adsorbed on the surface of copper-based catalysts modified or not by Ru or Pt. This phenomenon can be explained through the induced reduction of hydroxylated copper in the presence, at the catalyst surface, of H2Ru or H2Pt electrodes that fix their potential on the total catalyst.

TL;DR: In this article, a series of ZrO2-SiO2 catalysts with various molar ratios of ZRO2 and SiO2 were prepared by a coprecipitation method.

TL;DR: In this article, the formation and decomposition of the 12-molybdophosphate and 12-tungstophosphates anions proceed through several species as the pH of the solution is changed, and no evidence was observed for the formation of the Keggin anion when solutions containing molybdate and either pyrophosphate or phosphite ions were studied.

TL;DR: In this article, the aldol condensation of acetone was studied over solid base catalysts such as Ca(OH)2, La(OH), ZrO2 and CeO2 in the vapor phase over the temperature range 473-673 K. The reactions were carried out by means of a micropulse reactor, which was directly connected to a GC/MS system.

TL;DR: In this paper, it was shown that palladium metal supported on alumina is an effective catalyst for the formation of phenyl isocyanate, PhNCO, when activated by ortho-phenanthroline or its derivatives, and by 2,4,6-trimethylbenzoic acid (TMBA) (T = 180 °C, P(CO) = 40 atm, in dry benzene).

TL;DR: In this paper, the authors investigated the molecular structure and monolayer coverage of the surface niobium oxide phase on oxide supports (MgO, Al 2 O 3, TiO 2, ZrO 2 and SiO 2 ).

TL;DR: In this article, it was shown that the Co(OAc)2/O2/HOAc reaction is initiated by adventitious peroxide in acetic acid and is then propagated via a free radical chain reaction.

TL;DR: In this article, the authors identify the primary products of the reaction in order to propose a mechanistic explanation for the selective hydrogenation of ethyl acetate to ethanol and propose a reaction mechanism involving a single rhodium atom.

TL;DR: In this article, the catalytic activity and selectivity of the titanium silicate molecular sieve, TS-2, in ammoximation of cyclohexanone and other carbonyl compounds with H2O2 and NH3 is reported.

TL;DR: In this article, the trans axial ligand role of transaxial ligands in model P-450 catalysts was investigated for the oxidation of cyclohexene in methylene chloride, benzene, benzonitrile, and acetonitrile.

TL;DR: In this article, the reduction of supported CuO and CuCI 2 has been studied by thermal analytical methods, and it was shown that the ratio of the peak areas being close to 1:1 ; an intermediate Cu 1 state is clearly implicated.

TL;DR: In this article, it was shown that the Re2O7/Al2O3-SnR4 catalysts can be achieved with modified rhenium catalysts, where a third metal oxide was incorporated and when a different support was used, e.g. silica-alumina.

TL;DR: In this paper, the synthesis and characterization of the previously unknown SiW9(NbO2)3O377−, a novel composition of matter containing three adjacent NbvO2 peroxide groups, is described.

TL;DR: In this paper, the authors discuss the original discovery of unexpected olefin chemistry which involved the transition metal-catalyzed scrambling of olefins as well as the ring-opening polymerization of cycloolefs.

TL;DR: In this paper, a series of H-ZSM5 zeolites varying in Si/Al ratio were investigated for disproportionation of toluene and isomerization of xylene.

TL;DR: In this article, the treatment of alkynes with carbon monoxide and alcohols, using catalytic amounts of Pd(dba) 2 or PdOAc) 2 and 1,4-bis(diphenylphosphino)butane, affords unsaturated esters.

TL;DR: In this article, conditions ensuring a high isobutene selectivity together with a slow catalyst deactivation were derived for 1-butene over a fluorinated alumina catalyst, where the amount of the byproducts depends upon temperature, feed composition, contact time and time on-stream.

TL;DR: In this paper, the stability of supported Re2O7 metathesis catalysts was investigated in a micro catalytic flow reactor and it was shown that using a guard bed with tetraethyltin can significantly improve the stability.

TL;DR: Low conversions of isobutane catalysed by the zeolite HZSM-5 were measured with a steady-state flow reactor at 450-500 °C and an isobubane partial pressure of 7.98 kPa as mentioned in this paper.

TL;DR: In this article, it was shown that methyl glycol can be obtained selectively from dimethyl oxalate by hydrogenation in homogeneous phase in the presence of Ru 2 (CO) 4 (CH 3 COO) 2 (P t Pr 3 ) 2.

TL;DR: In this article, the peroxidase-catalyzed co-oxidation of 8 phenols with 4-aminoantipyrine (AAP) has been studied in 0.1 M phosphate buffer, pH 7.0, at 25°C.