Showing papers in "Journal of Molecular Catalysis in 1993"

TL;DR: In this article, Raman and IR spectroscopy were used to study the surface structures of chromium oxide supported on alumina, titania, zirconia, and silica, as a function of the loading under dehydrated conditions.

TL;DR: In this article, a catalytic oxidation of hydroxymethyl furfural leads to 2,5-furandicarboxylic acid, which is obtained in less than 2 h and the purity of the diacid obtained is > 99%.

TL;DR: The gold/platinum bimetallic systems stabilized by polymer and micelle were obtained by alcohol-and photo-reduction of the corresponding metal ions in the presence of water-soluble polymers and non-ionic surfactant-micelles, respectively as mentioned in this paper.

TL;DR: In this paper, two series of mixed oxides ZrO2 and TiO2 were prepared from propylate hydrolysis, followed by drying and calcination, and they were characterized by adsorption of specific probe molecules (carbon dioxide, pyridine, 2,6-di-methylpyridine) studied by FT-IR spectroscopy.

TL;DR: In this paper, solid state NMR (51 V, 27 Al, 31 P) and ESR were used to characterize the vanadium site in VAPO-5, as obtained by a fluoride-assisted synthesis.

TL;DR: In this paper, the catalysts were prepared by using anionic, cationic or organometallic platinum precursors for hydrogenation of p-chloronitrobenzene (CNB).

TL;DR: In this article, the molecular structures of the chromium(VI) oxide surface species are a function of the surface coverage and calcination temperature because under ambient conditions the surface structures depend on the net surface pH at point of zero charge of the hydrated oxide surface.

TL;DR: A stoichiometric reaction of benzene with the surface α-oxygen produced in N2O decomposition has been studied over FeZSM-5 zeolites in this paper.

TL;DR: In this article, the influence of particle size, bimetallic formulation and nature of support on activity and selectivity to the desired product, cinnamyl alcohol, was investigated.

TL;DR: In this article, the authors studied the hydrogenation of acrolein in the vapor phase on various supported Group VIII metals, including graphite, graphite and ruthenium.

TL;DR: A DRIFT study of the adsorption and the (amm) oxidation of toluene was carried out at 150-300°C on a TiO2(B)-supported vanadia catalyst with a loading corresponding to 1.9 Mg V2O5 per m2 of the support surface area.

TL;DR: In this paper, the catalytic activities in the oxidation of 2-mercaptoethanol of the different supported porphyrins are compared, and the influence of the substituents, correlating with their Hammett constants σp, and of the ligand types are discussed on the basis of the metal LUMO orbital energy.

TL;DR: In this paper, the authors used Raman spectroscopy and methanol oxidation reaction to design a supported metal oxide catalysts from molecular level information obtained from Raman Spectral Resonance Imaging (RMI).

TL;DR: In this paper, the photocatalytic bleaching of methyl orange in titanium dioxide suspended in aqueous solution was investigated, using titanium dioxide as catalyst, methyl orange was bleached by photooxidation via the formation of HO• radical in alkaline solution and by both photooxification and photoreduction, drastically enhanced by bubbling oxygen, in acidic solution.

TL;DR: In this paper, an acetamidate-bridged mixed-valent octanuclear platinum complex, [Pt(2.25+) 8 (NH 3 ) 16 (CH 3 CONH) 8 ](NO 3 ) 10 ·4H 2 O, was employed as a hydrogen-producing catalyst in a photochemical model system, containing EDTA as a sacrificial electron donor, [Ru (2,2′-bpy) 3 ] 2+ as a photosensitizer and methyl viologen as an electron relay.

TL;DR: In this article, the selectivity of the orthovanadates of Mg, Zn, Cr, Ni, Cu and Fe was investigated for butane oxidation at 500°C using a feed of C 4 /O 2 /He of 4/8/88.

TL;DR: Isotactic polypropene was prepared using rac-dimethyl-silylbis(2-methyl-4-t-butyl-cyclopentadienyl) zirconiumdichloride (1) and methylalumoxane (MAO) at temperatures between 0 and 80°C and with Al/Zr ratios of 300 and 1500 as discussed by the authors.

TL;DR: The appearance of these Chini complexes is most probably connected with the occurrence of the low temperature water gas shift reaction as mentioned in this paper, which occurs after the adsorption of CO at 300 K. The results of the reduction with hydrogen results in characteristic particle size distributions, which are reflected in distinct vibration frequencies of adsorbed CO, i.e., ca. 2010 cm −1 for d ≈1.2 nm.

TL;DR: In this paper, a rhodium (III) bis-terpyridine complex covalently linked to two pyrrole groups has been electropolymerized on a reticulated vitreous carbon electrode.

TL;DR: In this paper, a homogeneous catalytic system for ethylene polymerization is presented. But-1-ene is added to the reaction mixture, and the results showed that the catalyst is still able to perform the homopolymerization of ethylene with a very high productivity, even in the presence of but- 1-ene in reaction mixture.

TL;DR: In this paper, the results of adsorption on two oxide surfaces were compared: (i) a reactive transition metal oxide surface of Cr2O3(111) where it was shown that the surface contains Cr2+ ions which trigger its reactivity; (ii) a non-reactive simple metal oxide surfaces of γ-Al2O 3(111), which was used as a support model surface.

TL;DR: In this paper, the vanadium atoms of mixed addenda heteropolyanions are used as catalysts for the oxidation of alkylaromatic compounds to the respective acetates or alcohols and aldehydes or ketones using 30% hydrogen peroxide as oxidant.

TL;DR: In this paper, selective hydrogenations of different α,β-unsaturated aldehydes into allylic alcohols with immobilized homogeneous catalysts are reported. And different kinds of catalysts were used: supported aqueous-phase catalysts (RuCl2(TPPTS)3/SiO2 and RuH2( TPPTS)4/Si O2) and supported homogeneous catalyst (especially phosphino-iridium catalysts like IrCl3{(C6H5)P[(CH2)3SiO 3 2

TL;DR: Vanadium complexes formed from VO (acac) 2 as the starting material for the catalysts have been characterized in situ with 51 V and 1 H NMR and EPR in the course of three types of catalytic reactions as mentioned in this paper.

TL;DR: In this paper, it is suggested that hydrogenation of the CO group occurs on sites associated with tin ions, and the carbonyl group is polarized, facilitating hydrogen transfer from an adjacent RuH site.

TL;DR: In this article, the Ga 1− x Fe x CuMnO 4 system has been studied for the decomposition of 1-octanol, and the activation energy for electronic conduction varied between 0.35 and 0.135 eV. All the catalysts exhibited cubic symmetry and p-type semiconductivity.

TL;DR: In this article, a new synthetic procedure to carbon-carbon bond formation between CH acidic compounds and nucleophiles, like Michael acceptors and nitriles, is based on the use of metal(II) centres as catalysts in a homogeneous phase.

TL;DR: The trans-Pd(COOR)ClL2 (PPh3, R = Et, n-Pr, iso-Pr and iso-Bu as discussed by the authors, sec-Bu, 2-ethoxyethyl, cyclopentyl, cyclohexyl; L = 1,2-diphenylphosphinoethane and Et = Et.

TL;DR: Copper(II), palladium(II) and silver(I), in conjunction with non-coordinating anion environments, have been found to catalyze the hydration of a variety of functionalized and nonfunctionalized alkynes as mentioned in this paper.