Showing papers in "Journal of Molecular Catalysis in 1989"

TL;DR: Giant cationic palladium clusters approximated as Pd561L60(OAc)180 (L = phen, bipy) and pd561phen60O60(PF6)60 were synthesized and characterized with high resolution TEM, SAXS, EXAFS, IR and magnetic susceptibility data as discussed by the authors.

TL;DR: In this paper, a procede sol-gel for the inclusion of cellules of Saccharomyces cerevisiae dans des couches minces de gel de silice deposees sur des surfaces in verre vitre.

TL;DR: In this article, the authors used a series of di-and mononuclear orthopalladated complexes of the type trans-Pd2L2X2 and trans-pdLL'Cl as catalysts in DMF medium.

TL;DR: In this article, the authors reviewed the recent developments in the process of self-condensation of acetone, evaluating the significance of various parameters for obtaining the desired product, and concluded that the selectivity of the reaction for the desired products is achieved by proper choice of catalyst and experimental conditions.

TL;DR: In this paper, the influence of the reaction medium upon the enantioselective hydrogenation of α-ketoesters to the corresponding α-hydroxyesters has been studied, using a commercial platinum-on-alumina catalyst modified with cinchonidine.

TL;DR: In this paper, a series of ZrO2 catalysts modified with sulfur compounds were prepared by treating Zr(OH)4 with sulfate ion and by treating H2S, CS2, and SO2 followed by oxidation.

TL;DR: In this article, the energy of deprotonation is used as a quantum-chemically accessible measure of acidity, and it is analyzed to what extent spectroscopic parameters (OH valence stretching frequency, 1 H NMR chemical shift) are suitable measures of acidities.

TL;DR: In this article, the surface properties of a fumed vanadium oxide sample have been studied by FT-IR spectroscopy and it has been found that evacuation at temperatures up to 673 K causes a partial reduction of the sample, with a decrease in transmission of the IR light corresponding to the formation of ESR-detectable paramagnetic centers.

TL;DR: In this paper, the regio selectivity of styrene hydroformylation in the presence of Rh 4 (CO) 12 as catalytic precursor is strongly affected by reaction parameters: the branched isomer, which prevails m all cases, decreases with increasing reaction temperature and decreasing gas pressures.

TL;DR: In this article, the main kinetic regularities of these reactions have been elucidated, and the catalytically active palladium species have been detected and characterized by 1 H, 13 C and 31 P NMR.

TL;DR: In this article, the effect of metal chlorides to platinum-supported catalysts has been studied in the hydrogenation of cinnamaldehyde in the liquid phase, and a reaction mechanism for hydrogenation over promoted platinum is suggested.

TL;DR: In this article, the activity of various rare earth-exchanged Y-type zeolites was investigated in the acylation of toluene with octanoic acid for which the yield in acylated product is 75% and the selectivity in para isomer 94%.

TL;DR: In this paper, nonporous heteropoly oxometalates are shown to be capable of absorbing polar molecules into their bulk structures while retaining their properties as solids, and the results from photoacoustic FTIR, X-ray diffraction and sorption measurements are employed to illustrate this feature.

TL;DR: In this article, the potential electrolysis of acidic solutions of cis-diaquabis-(2,2'-bipyridyl-4,4'-dicarboxylate) yields the title compound 1 in quantitative yield.

TL;DR: In this paper, the intermediate formed during the oxidation of benzylamine with molecular oxygen at atmospheric pressure and 80 °C to yield the corresponding nitrile catalyzed by Ru(PPh 3 ) 2 (RCH 2 NH 2 ) 2 Cl 2 ( I ) (a reaction previously studied), has been shown to be Ru(pPh 3 ),(RCN),RCH2 NH 2 ),Cl 2 ( R = C 6 H 5, p -CH 3 OC 6 H 4 ) ( II ), a complex such as cis -Ru(bipy) 2

TL;DR: In this paper, a mechanism was proposed for the formation of formic acid and formaldehyde and their decomposition to CO and H2O, the end products of the reverse water-gas shift reaction.

TL;DR: In this article, the alkylation of phenol with methanol was studied at 473 K, at atmospheric pressure in a flow reactor, in the presence of ultrastable (US) HY zeolite.

TL;DR: The FT-IR spectra of the surface species arising from the adsorption of methanol, formaldehyde and formic acid on pure vanadia and vanadia-silica are discussed in this paper.

TL;DR: In this article, the authors show that the formation of alcohols may be related to the presence of bridged-CO species on the surface of the catalysts, and they show that Co2(CO)2 supported on SiO2 changes to Co4(CO), and then to highly dispersed cobalt metal when heated in a stream of hydrogen at 673 K.

TL;DR: In this paper, a model of catalyst-reactant interaction is described, where one role of the catalyst is to supply energy into that vibrational mode of the reactant that most effectively takes the system to the activated state.

TL;DR: Pyridine adsorption on ceria surfaces, prepared by thermal decomposition of diammonium hexanitratocerate at 400 °C, was studied by infrared spectroscopy and gravimetric techniques as mentioned in this paper.

TL;DR: In this article, cyclopropane (CP) chemisorption on silica-molybdena catalysts photoreduced in CO was found to result in a sharp increase (by more than one order of magnitude at 293 K) of specific activities for propene metathesis.

TL;DR: In this article, the effect of particle size on enantioselective hydrogenation of ethyl pyruvate to ethyl lactate in the liquid phase was studied using a series of Pt/γ-Al 2 O 3 catalysts modified with cinchonidine.

TL;DR: In this paper, Extended X-ray absorption fine structure (EXAFS) spectroscopy has been used in conjunction with other techniques to characterize bonds between mononuclear metal complexes and metal oxide surfaces and also to provide structural information about metal-support interfaces in highly dispersed supported metal aggregates.

TL;DR: In this paper, a mixture of Mo16O3 and 18O-labeled α-Sb2O4 and pure oxides are contacted with propene in the absence of molecular oxygen.

TL;DR: In this paper, the catalytic activity of the polycondensation of rh(CO)Cl[PPh2CH2CH 2CH2SiO3/22·xSiO2 (H) with tetraethoxysilane is compared with that of the homogeneous compound H and with catalyst S, prepared by attaching H to the surface of SiO2.

TL;DR: In this paper, an IR cell which can be used as a continuous flow reactor up to 1 MPa and 525 K was used for methanol synthesis from CO + CO 2 + CO2 + H2 reaction on a 15% Cu-ZnAl2O4 catalyst.

TL;DR: In this article, the use of methyl formate instead of CH 3 OH/CO as a catalyst for the synthesis of propionic acid is described. Butadiene reacts with methyl formates to give 3-pentenoates.