Showing papers in "Journal of Catalysis in 1983"

TL;DR: In this paper, the complete mineralization of trichloroethylene (Cl2CCClH) in dilute aqueous solutions, to HCl and CO2, was demonstrated with heterogeneous photoassisted catalysis using illuminated titanium dioxide (TiO2).

TL;DR: In this paper, infrared and volumetric studies of NO adsorption have been used to elucidate the type of surface structures present in sulfided Co Al 2 O 3, Ni Al 2O 3, Mo Al 2 o 3, CoMo S 2, and Ni Al O 3 catalysts.

TL;DR: In this article, the influence of the different experimental operating variables used in temperature-programmed reduction (TPR) measurements on the reduction profiles has been studied using the reduction of nickel oxide as an example.

TL;DR: In this paper, a model for the redispersion of Pt in oxygen is proposed and two surface oxides, α- and β-[PtO2]s, and two chloride-containing surface complexes are found and a comprehensive scheme of surface reactions is proposed.

TL;DR: In this paper, the authors investigated the kinetics of methane oxidation over palladium and platinum catalysts supported on a number of metal oxides using a pulse-flow microreactor technique.

TL;DR: In this paper, the activities of sulfided MoC, WC, CoC, NiC, Co-MoC, and Ni-WC catalysts for thiophene hydrodesulfurization and butene hydrogenation were studied using a flow microreactor operating at atmospheric pressure.

TL;DR: In this paper, a simple model for the different kinds of interaction that occur following a low and a high-temperature reduction of Group VIII noble metals supported on TiO 2, was developed.

TL;DR: In this paper, the performance and availability of supported heteropoly acid under vapor phase conditions were studied through alkylation of benzene with ethylene, esterification of acetic acid with ethanol, and dehydration of 2-propanol as model reactions.

TL;DR: In this article, the specific activity for NO reduction was found to be sensitive to the nature of the catalyst pre-treatment, and the rate-limiting step in this model was assumed to be the dissociation of chemisorbed NO.

TL;DR: In this article, the reaction rates in the absence of accumulated product are described by a simple Langmuir form, rate = k · K[chloromethane]1 + K [chloromethrane]2 + K[ chloromethanes]

TL;DR: The metal-support interaction between iron and titania, which is initiated by reduction at 800 K and is responsible for the changes in ammonia synthesis kinetics, is due to titanium species at the surface of the metallic iron particles as mentioned in this paper.

TL;DR: In this paper, a series of Pd SiO 2 catalysts (2 wt% Pd) with and without a promoting additive were used as promoters, and it appeared that promoters (i) influence the activity of the catalysts and (ii) increase the selectivity for "oxygenates" and suppress the selectivities for CH4.

TL;DR: In this article, it has been shown that the commonly observed and heretofore empirically treated lignite char deactivation with increasing severity of pyrolysis conditions can be correlated with a measurable fundamental property of the chars: catalyst dispersion.

TL;DR: In this paper, surface alloys were formed by heating the Pt(111) crystal that was covered with a Au multilayer, and the surfaces were characterized with Auger electron spectroscopy (AES), low-energy electron diffraction (LEED), and temperature-programmed desorption (TPD) of CO.

TL;DR: In this article, the formation of different oxidized Pt surface species previously indicated by TPR studies was confirmed by characteristic uv-vis spectra, which were used as the basis for a model describing the types of surface reactions and details of the platinum surface species formed in oxygen and in hydrogen.

TL;DR: A fundamental behavior of the CeO/sub 2/ in its reduction by hydrogen and carbon monoxide and in the oxidation by water and carbon dioxide is described in this article, where the effects of solid additives on the rates of reduction and oxidtion of the oxide are also described briefly.

TL;DR: The effect of presulfiding of a commercial NiMoAl2O3 catalyst has a significant effect on its inherent activity for the hydrodenitrogenation of quinoline (HDN).

TL;DR: In this article, the reduction-oxidation properties of perovskite-type mixed oxides (La1 − xSrxCoO3 − δ, x = 0, 0.1, 0., 0.2, CO O 2 2, 0.4, and 0.6) were investigated using flow and pulse methods.

TL;DR: In this article, the surface of the Urushibara precursors consists primarily of precipitated nickel covered with a thick oxide coating of Zn or Al, depending on which metal was used to precipitate the nickel from solution.

TL;DR: In this article, temperature-programmed desorption (TPD) was applied to the investigation of hydrogen adsorption/desorption from a series of cobalt catalysts.

TL;DR: In this article, the authors show that the fractional coverage in growing chains is low and, consequently, the chain growth relatively fast i.e., not rate-determining.

TL;DR: In this article, a mechanism for the acceleration by aromatic hydrocarbons of zeolite-catalyzed methanol conversion is proposed. But the mechanism is not applicable to the case of polycyclohexadiene.

TL;DR: Oligomerization reactions of ethene, propene, isobutene, and 2-methyl-butene-1 on zeolite H-ZSM-5 at 300 and 373k were investigated using high-resolution solid-state 13C-NMR spectroscopy as discussed by the authors.

TL;DR: In this article, the rate of conversion of methanol and aqueous methanols to hydrocarbons over H-ZSM-5 zeolite is enhanced by the addition of aromatic hydro-carbons to the feed.

TL;DR: In this paper, a Monte-Carlo model for diffusion and reaction in a ZSM-5 zeolite crystal is developed to study the effects of intracrystalline occupancy by gaseous molecules on the degree of diffusional effects on the reaction.

TL;DR: In this article, a model incorporating terminal and bridging MoS bonding and anion vacancies is proposed, based on the conversion of isolated and aggregated molybdate and MoO3 species to oxysulfide.

TL;DR: Amorphous solid acids, such as SiO 2 Al 2 O 3 and halided-Al 2 o 3, convert isobutane 30 to 400 times faster than a blank reactor, and yield a product consisting primarily of methane, propene, butenes and hydrogen as mentioned in this paper.

TL;DR: In this paper, the effect of supports (TiO2, Al2O3, SiO 2, MgO) on the dissociation of CO over supported Rh has been investigated by means of infrared spectroscopy, pulse technique, thermal desorption, and temperature-programmed reaction analysis.

TL;DR: In this paper, a high-pressure-flow microreactor was used to study the desulfurization of dibenzothiophene on a presulflded molybdenaalumina catalyst.

TL;DR: In this article, the pore structure of the crystalline zirconium phosphate (produced according to specific manufacturing procedures) appears to be particularly suitable for this reaction in the sense that it is a selective catalyst.