Showing papers in "Journal of Molecular Catalysis in 1988"

TL;DR: In this article, the interaction of chromium oxide with Al2O3, TiO2 and SiO2 supports was investigated with Raman spectroscopy and the influence of the nature of the oxide support, calcination temperature and chromium oxides loading upon the molecular state of the supported chromium dioxide was determined.

TL;DR: In this paper, the CO-reduced Phillips catalyst (Cr(II) ions supported on silica) has been studied by IR spectroscopy and the number of active sites is shown to increase during the polymerization and to reach some 10% of the total loading.

TL;DR: In this article, the interaction of rhenium oxide with an alumina support was examined over a wide range of conditions (rhenium oxides loading, calcination temperature and environment) using laser Raman spectroscopy (LRS) and X-ray absorption near-edge spectrograph (XANES).

TL;DR: In this paper, a review with 96 references details the advances in homogeneous catalysis of the water-gas shift reaction (WGSR) over the last 10 years, including transition metal catalysis under both acidic and basic conditions.

TL;DR: XPS analysis of monocrystalline surfaces of V2O5 revealed that the (010) crystal plane contains only V+5 and O2− ions, whereas the (100) plane is covered by OH groups as discussed by the authors.

TL;DR: In this paper, carbon dioxide reduction on platinum and carbon felt electrodes coated with polymeric films obtained by oxidative electropolymerization of pyrrole-containing Re(L)(CO)3Cl complexes, where L is a 2,2'-bipyridine, was investigated.

TL;DR: In this article, a complex of the type W(CHtBu)(NAr)Cl2(dme) (Ar = 2,6-diisopropylphenyl) with PCl5 in dimethoxyethane is presented.

TL;DR: In this paper, a new family of long-lived catalysts based upon the (bis(2-pyridyl-imino)isoindolinato) ligand was discovered.

TL;DR: In this paper, a unique mechanism for a cobalt-Schiff base complex-catalyzed monooxygenation of alkenes is reported, which involves rate-determining decomposition of a benzyl alcoholatocobalt(III) complex to benzaldehyde and a hydridocobalcoobalt species, followed by rapid addition of the hydride intermediate to styrene, and dioxygen incorporation into the resulting organobalt complex.

TL;DR: In this article, a 95% conversion of dimethyl oxalate to the corresponding glycol has been achieved under optimum conditions, under a high hydrogen pressure and the pre-treatment of the catalytic system with a hydroxylated reactant such as methyl glycolate or ethylene glycol itself.

TL;DR: In this paper, simple stereochemical rules have been found that establish a relationship between product configuration and catalyst or reactant configuration for the two most effective and extensively studied asymmetric reactions, viz., asymmetric hydrogenation of dehydroacylamino acids in the presence of chiral rhodium-phosphine complexes and asymmetric reduction of ketones with chiral hydrides.

TL;DR: In this paper, the structure of alumina-supported rhenium oxide after calcination is described and several explanations are discussed, mainly based on temperature programmed reduction and ESR studies.

TL;DR: In this article, the activation energy for the formation of methanol was estimated as 5.6 kcal mol−1, and the generalized reaction pathway was discussed, where the major product was methanoline (selectivity, ~70% at 90 °C), followed by formic acid (11%), ethanol (5%), formaldehyde (5), acetone (4%), and acetic acid (3%).

TL;DR: Extended X-ray absorption fine structure (EXAFS) spectra were obtained for chromium(VI) oxide species on silica, ammonium perrhenate on alumina and for their various products after calcination in dry air.

TL;DR: In this article, the regeneration of NAD(P)H is accomplished with CdS semiconductor powder and TiO2 colloids using formate or mercaptoethanol as electron donors.

TL;DR: RuCl 2 (TRIPHOS) as discussed by the authors catalyzes the homogeneous hydrogenation and isomerization of olefins, hydrogenation of alkynes, aldehydes, ketones and nitriles, under moderate reaction conditions in different organic solvents.

TL;DR: In this paper, the authors describe a highly efficient catalyst for the isomerization of methyl formate to acetic acid at 180°C, which they call RLII.

TL;DR: In this paper, the reductive carbonylation of nitrobenzene to give PhNHCO 2 Me is catalysed by Ru 3 (CO) 12 in toluene-methanol at 170 °C and 60 atm.

TL;DR: In this paper, a mechanism involving association of the α-olefin substrate with the N- and P-ligated ruthenium carbonyl, or hydrogen transfer to form an alkyl-Ru intermediate, has been proposed as rate-determining steps under normal oxonation conditions.

TL;DR: The photocatalytic metathesis reactions of olefins in systems containing Group VI metal carbonyls are reviewed in this article, where the authors focus on the transition compounds formed in these systems and the reaction mechanism.

TL;DR: In this article, the synthesis of olefin metathesis of vinyl (methyl, alkoxy)-substituted silanes, in the presence of highly active catalytic systems based on complexes of ruthenium and rhodium, as well as those with various hydride-donor cocatalysts and dioxygen activators, are summarized.

TL;DR: In this article, carbon dioxide has been reduced at metal porphyrin-modified electrodes in the presence of homogeneous catalysts, and an external source of energy was required to rereduce MTPP+ to the active mediator.

TL;DR: In this paper, the formation mechanism of molybdenum-carbene intermediates, arising from the interaction of ethylene, propene and cyclopropane with Mo4+ ions in photoreduced silica-molyb dena catalysts for olefin metathesis, was studied by UV-Vis diffuse reflectance spectroscopy and mass spectrometry.