Showing papers in "Journal of Catalysis in 1980"

TL;DR: In this article, a new silica-rich zeolite has been synthesized with greatly differing SiO2/Al2O3 ratios; the aluminum content, while always small, can be varied by several orders of magnitude.

TL;DR: In this paper, the effect of surface chemical composition on the kinetics of the catalytic methanation reaction over a single crystal Ni(100) catalyst was examined using a specially designed ultrahigh vacuum system.

TL;DR: In this article, the effects of metal-support interactions on room-temperature H2 adsorption on alumina- and silica-supported Ni catalysts were investigated. But the results were limited to the case of Ni SiO 2 catalysts.

TL;DR: Chang and Silvestri as discussed by the authors showed that methanol and/or its ether reacted on the phosphorus-modified ZSM-5 zeolite to yield ethylene as the primary products, probably via a methyl ethyl ether intermediate, followed by alkylation of the ethylene with methanoline or its ether to give an olefin with one additional carbon atom.

TL;DR: In this paper, the authors showed that the NO-NH 3 reaction on vanadium oxide catalyst under the dilute gas condition was markedly accelerated by the addition of O 2, and the oxygen species responsible for the acceleration of the reaction was found to be the V 3+ O species on the catalyst.

TL;DR: In this article, the authors derived geometric shape models for spheres, cubes, and disks which gave the EXAFS average coordination number for first, second, and third coordination spheres as a function of cluster size.

TL;DR: In this paper, the authors investigated the properties of NiSiO2, NiAl2O3, and NiTiO2 catalysts representing wide ranges of dispersion and nickel concentration.

TL;DR: In this article, it was shown that the beneficial effects on catalyst selectivity and stability which are brought about by adding widely different catalyst modifiers (gold, tin, sulfur, carbon) to platinum catalysts are largely due to one common cause, namely, the division of the platinum surface into very small ensembles of platinum atoms.

TL;DR: In this article, the ensemble effect was observed in the conversion of n-hexane over Pt upon its being alloyed with Sn and the change in selectivity can be interpreted in terms of a change in adsorption properties due to differences in the number of adjacent platinum atoms required for the various reaction pathways (ensemble effect).

TL;DR: In this article, the anisotropic nature of molybdenum disulfide has been investigated in terms of the O2 chemisorption capacities of the activity-tested catalysts.

TL;DR: In this paper, an analysis of new and available data on the adsorption of n-pentane, n-hexane, 3-methyl pentane, p-xylene, toluene, and isopentane in ZMS-5 zeolites suggested that the reactant molecules enter the ZSM-5 catalyst essentially by its sinusoidal channels and that the isoaliphatic and aromatic products diffuse preferentially in the linear and elliptical channels.

TL;DR: The carbenium ion mechanism in the formation of various aliphatic (C1,C6) and aromatic (C6,C10) hydrocarbons was studied in this article.

TL;DR: In this article, the authors examined the chemisorption of hydrogen on pure and Cu-covered Ru(0001) surfaces by means of low energy electron diffraction (LEED), work function (Δϑ) measurements, and thermal desorption spectroscopy (TDS).

TL;DR: In this article, the catalytic decomposition of formic acid was studied on a (110)-oriented copper single-crystal surface and the rate constant was determined to be 9.4 × 10 13 exp ( −31,870 RT ) sec −1.

TL;DR: In this article, the adsorption and methanation of carbon dioxide on a nickel/silica catalyst were studied using temperature-programmed desorption, and temperatureprogrammed reaction.

TL;DR: In this article, the decomposition of methanol-OD was studied on W(100) and W (100)-(5 × 1)C surfaces by temperature-programmed reaction spectroscopy.

TL;DR: In this paper, X-ray photoelectron spectroscopy has been employed to characterize the surface of nickel boride hydrogenation catalysts and the data indicate that the surface stoichiometry is identical to the bulk Ni 2 B.

TL;DR: In this paper, thin copper overlayers on a Ru single-crystal surface were prepared as models for Cu/Ru “bimetallic cluster” catalysts, and various amounts of copper were deposited at 540 K on a ruthenium(0001) crystal surface.

TL;DR: In this paper, the effect of cobalt on the structure and reducibility of a series of molybdena-alumina catalysts was studied, and two separate phases were found, a Co-Al2O3 interaction phase, which was nonreducible, and a well-defined Co3O4 phase which reduced to Co metal.

TL;DR: In this article, the CO shift reaction over a Cu ZnO catalyst, CO + H2O and CO2+H2, has been studied to obtain kinetic evidence for the supposition that it proceeds via a formate-type intermediate on the catalyst surface.

TL;DR: In this paper, a controlled atmosphere electron microscopy has been used to follow the growth of filamentous carbon on NiFe surfaces from the catalyzed decomposition of acetylene.

TL;DR: In this paper, the adsorption of Ru3(CO)12, α-H4Ru4(CO), and Ru6C(CO)-17 on γ-Al2O3 and SiO2 was investigated.

TL;DR: In this article, the side-chain alkylation of toluene with methanol has been studied experimentally and a detailed mechanism of the reaction has been investigated by using quantum chemistry.

TL;DR: In this paper, the response of several bismuth molybdate-based catalysts to reduction under propylene ammoxidation conditions in the absence of gaseous oxygen, and to reoxidation by gas oxygen, was studied using a pulse microreactor method.

TL;DR: In this article, the low-temperature interaction between H2 + CO2 on RhAl2O3 was investigated by adsorption and infrared spectroscopic measurements, which indicated that the presence of H2 greatly enhances the uptake of CO2 by RhAl 2O3 catalyst.

TL;DR: In this paper, the authors developed two reaction models which include separate adsorption, desorption and surface reaction steps, and which do not assume an adaption equilibrium.

TL;DR: In this paper, the authors measured the rates of C2H6, C3H8, and n-C4H10 hydrogenolysis on homogeneous, SiO2-supported NiCu alloys for which surface and bulk compositions were shown to be very similar.

TL;DR: Ozaki et al. as discussed by the authors found that carbon-supported ruthenium was much less active than either alumina- or silica-supported ruthensium in the ammonia synthesis reaction, and the same trend may exist for the hydrogenation of these two isoelectronic molecules.