Showing papers in "Journal of Molecular Catalysis in 1984"

TL;DR: In this article, two types of polyoxoaluminum solutions, base-hydrolyzed A1Cl 3 and aluminum chlorohydrate (ACH) with OH/A1 ratios of 2.42 and 2.50, respectively, have been used as reagents for the pillaring of the smectite clays montmorillonite and nontronite.

TL;DR: In this paper, a back-mixed flow reaction was carried out in a back mixed flow reactor in the presence of 0.04 wt.% Pd/Al 2 O 3 catalyst containing 0:100, 30:70, and 80:20 atoms Cu:atoms Pd.

TL;DR: In this paper, the authors defined the development of their present understanding of the urease molecule and described physical and chemical properties of the enzyme, the interaction of inhibitors with the active site Ni(II) ion(s), substrate specificity and differential effects of pH on catalytic efficiency.

TL;DR: In this paper, a brief discussion of the present status of knowledge of the mechanism of intercalation processes in α-zirconium phosphate, recent developments particularly in the synthesis of new layered materials with α-structures are examined.

TL;DR: In this paper, the effect of alloying an active transition metal with an inactive diluent is analyzed in terms of different ensemble requirements for parallel and consecutive reaction paths for bimetallic catalysts.

TL;DR: In this article, a mechanism based upon a consideration of the structure of the layered phosphate is presented, which involves a bridged dicopper dioxygen complex, and the reduction of Cu(II) to the metal and the nature of the metal particles is also described.

TL;DR: In this article, semi-empirical extended Huckel calculations have been performed on simulated anions of heteropoly compounds and the results when compared with experimental information show that the activity of these compounds in acid-catalyzed processes is inversely related to the net atomic charges on the outer oxygen atoms, while the activity in oxidation reactions correlates inversely with the partitioned energy of the bond between the inner oxygen atom and the peripheral metal atom to which it is coordinated.

TL;DR: In this paper, cobalt ion-exchanged faujasites X were subjected to reactions with 1,2-dicyanobenzene as well as with dunethyl glyoxime.

TL;DR: Ion-exchanged montmorillonites can be used as heterogeneous catalysts for the dehydration of liquid alcohols in pressure vessels at 200 °C as discussed by the authors, and they are more selective than concentrated mineral acids and have the distinct advantage of being much easier to separate from the products.

TL;DR: In this paper, a two-component hydrogen-transfer system consisting of NaX-type zeolite and isopropanol was applied as reducing agent for MPV reduction in a continuous flow reactor.

TL;DR: In this paper, a reaction with triethylsilane in 1,2-dichloroethane solution in the presence of [(C 5 Me 5 Rh) 2 Cl 4 ] catalyst is described.

TL;DR: Although montmorillonites have little catalytic activity in their natural Na+ form, various cation-exchanged sheet silicates have proved to be effective catalysts for a wide variety of organic reactions as mentioned in this paper.

TL;DR: In this article, the authors considered the influence of the factors mentioned for different hydrocarbon transformations as well as for hydrocarbon synthesis on the catalytically active surface of unsupported and supported alloys.

TL;DR: In this paper, the steric reaction of dicarboxylic acids was studied in the homogeneous phase in the presence of H4Ru4(CO)8(PBu3)4.

TL;DR: In this article, a Pd-Pb alloy supported on the CaCO 3 system was characterized, and the selectivity was attributed to the ordered structure of the pd-pb alloy.

TL;DR: In this paper, the authors used X-ray photoelectron spectroscopy (XPS), electron microscopy and cyclic voltammetry to characterize the behaviour of two differently prepared platinum catalysts supported on TiO 2 (anatase).

TL;DR: In this article, the use of shape-selective reactions in zeolite characterisation is examined and it is concluded that in equilibrium reactions, such as the isomerisation of m -xylene, the relative rates of formation of the two products reflect their diffusionally limited transport.

TL;DR: The complexes Ph(Ph3P)Ni(Ph2PCHCOPh) 1 and (η3-C8H13)Ni (Ph2PC-H2COO) 2 were heterogenized by several modes of fixation, and their catalitic behavior in the oligomerization of ethylene was investigated in this article.

TL;DR: Using catalysts prepared in situ from [Rh(NBD)Cl] 2 and chiral diphosphines of the type Ph 2 PCHRCH 2 PPh 2 (R = Ph, i-Pr, PhCH 2 ) optical yields above 60% were achieved in the hydrogenation of PhMeCNCH 2 Ph as discussed by the authors.

TL;DR: For example, in this article, the synthesis of t-alkyi esters failed at temperatures much above room temperature due to the rapidity of the competing process, and all other ester types could be synthesised at temperatures up to 200 °C.

TL;DR: In this article, the structural properties of rhodium crystallites were determined after reduction with H{2, evacuation at elevated temperatures, CO admission at room temperature, CO desorption, and admission at 523 K (at which temperature the Boudouard reaction takes place).

TL;DR: In this paper, the influence of free ligand concentration on the reaction course was studied for two selected catalysts, i.e., Rh(AA)(CO)(PPh3) and Phosphite (P(OPh)3]2), for hex-1-ene hydroformylation.

TL;DR: In this paper, the surface chemistry of Co2(CO)8 supported on SiO2 or γ-Al2O3 was studied in connection with the potential preparation of specific surface structures and new well-defined solid catalysts.

TL;DR: Carbonylation du nitrobenzene en presence de Pd(phenanthroline-9,10,11,12) and preparation du carbamate de phenyle as mentioned in this paper.

TL;DR: In this article, the direct formation of the phenylated olefins from benzene and olefin can be rationalized in terms of the following steps: (i) oxidative addition of the benzene C-H bond to the rhodium catalyst, (ii) insertion of Olefin into the resulting phenyl-rhodium bond, and (iii) subsequent β-hydrogen elimination, giving the corresponding β-oxide elimination.

TL;DR: RhCl(m-SPΦ 2 ) 3 (avec m-SP Φ=diphenylphosphino-3 benzenesulfonique acide) is a catalyseur efficace de l'hydrogenation des acides gras insatures and des oxo-2 acides as discussed by the authors.

TL;DR: In this paper, the authors investigated the catalytic activity of cyclohexene, 1-pentene and styrene under mild conditions (25-50 °C, 1 atm equimolar mixture of CO and H 2 ) using as catalyst precursor either the Co 4- n Rh n (CO) 12 + x L ( n = 0, 2, 4; x = 0- 9) system or preformed Rh 4 CO) 12− x L x ( x = 1 - 4) substituted clusters, where L is a trisubstituted phosphine or

TL;DR: In this paper, temperature-programmed reduction (TPR) shows that these catalysts are almost completely oxidized during passivation, which leads to ultradisperse systems (H/Rh > 1.0).

TL;DR: In this article, the effects of the structure of the substrates, the diphosphine/Pd ratio, the CO pressure up to 800 kg cm−2, the R in ROH (alcohol), the solvent, and additives such as organic bases, halide salts and hydrogen have been investigated mainly for 2-phenylpropene.