Showing papers in "Journal of Catalysis in 1984"

TL;DR: In this article, the authors measured the oxygen removal at various temperatures using TPR traces of unsupported or alumina-supported ceria and showed that the reduction of surface capping oxygen and bulk oxygen anions is associated with reduction of the shared oxygen anion at the interface.

TL;DR: In this paper, it has been observed that carbon-free steam reforming of methane can be obtained on a partly sulfur-passivated nickel catalyst under conditions which, without the presence of sulfur, would result in formation of whisker carbon.

TL;DR: In this article, high temperature hydrogen adsorption and conventional 298 K adsorptions of hydrogen and carbon monoxide were characterized by unsupported cobalt and cobalt supported on silica, alumina, titania, magnesia, and carbon.

TL;DR: In this article, specific activity and selectivity of unsupported cobalt and cobalt supported on alumina, silica, titania, carbon, and magnesia carriers for CO hydrogenation were measured in a single-pass differential reactor at low conversions, 1 atm, and 175-350 °C.

TL;DR: In this paper, the authors studied the reaction kinetics of CO, C 3 H 6, 1-hexene, and toluene under excess O 2 and found that the olefin oxidation is strongly self-inhibited by HC and more than first-order in O 2, whereas the opposite was found for Rh.

TL;DR: In this article, specific intrinsic rates and product distributions for CO2 hydrogenation on Co/SiO2, Fe/Si O2, and Ru/Si o2 were determined at 450-650 K, 140-1030 kPa, and a range of space velocities.

TL;DR: In this article, the chlorinated hydrocarbons perchloroethylene, dichloroethane, monochloroacetic and dichlorocetic acids, in dilute aqueous solutions, are completely mineralized to HCl and CO2 by photoassisted heterogeneous catalysis with an aqueously slurry of near-uv illuminated TiO2.

TL;DR: Pecoraro et al. as discussed by the authors used the SCF-Xα calculations of the electronic structure of cluster models of the first and second row transition metal sulfides to identify several electronic factors which appear to be related to the catalytic activity of the sulfides.

TL;DR: In this article, three model test reactions, C-S hydrogenolysis (HDS) of thiophene, hydrogenation (HYD) of 1-hexene, and hydrocracking (HCG) of 2,4,4-trimethyl-1-pentene, were used to differentiate and assess the catalytic functionalities of sulfided CoMo catalysts, and their dependence on the nature of support and incorporation of additives.

TL;DR: In this article, the acidity of H-form zeolites which include mordenite, ZSM-5, Y-faujasite, and those modified by cation exchange or dealumination was measured by temperature-programmed desorption (TPD) of NH3.

TL;DR: In this article, an experimental and theoretical study of the behavior of metal, hydrogen-exchanged Y and USY zeolite cracking catalysts has been conducted using a new theoretical framework for acidity and showed that these data could be correlated against a single parameter, the unit cell constant of the steam deactivated catalyst.

TL;DR: In this article, the conversion of methanol to olefins over ZSM-5 zeolites is described and the interdependence of reaction parameters T, P, contact time, and catalyst Bronsted acidity in controlling olefin selectivity is characterized and interpreted.

TL;DR: In this article, the interaction of zinc ions with γ-alumina has been investigated using the surface spectroscopic techniques of X-ray photoelectron spectroscopy (ESCA or XPS) and low energy ion scattering spectrography (ISS).

TL;DR: In this paper, the electronic properties of palladium supported on SiO 2 and La 2 O 3 were investigated by X-ray photoelectron spectroscopy, showing that Pd is more electronegative than zero-valent Pd alone.

TL;DR: Gorte et al. as mentioned in this paper presented a model for temperature-programmed desorption from a packed bed of spherical particles, where dimensionless groups of easily measured catalyst parameters are presented which enable the experimenter to determine when complications due to readsorption, concentration gradients in the particles, lag times due to diffusion and hold-up in the sample cell are important.

TL;DR: In this paper, a closed system between 200 and 300 °C was used for redispersion of carbon monoxide layer over the platinum crystallites, and isotopic dilution experiments using 12CO13CO mixtures showed that the CO molecules are free of dipole-dipole coupling after the redispersive treatment.

TL;DR: In this paper, the authors showed that the products of fixed bed or slurry liquid reactors with iron catalysts frequently may be characterized as the sum of two Flory carbon number distributions, and that the dominating distribution shifts at about C10.

TL;DR: In this article, an in-depth investigation into the nature and characteristics of a ternary compound (Mg/sub 6/Al/sub 2/(OH)/sub 16/CO/sub 3/ x 4H/sub 1/O) and its evolution with the calcination temperature until the formation of the oxide phases was carried out.

TL;DR: In this article, the state of tin in Pt-Sn Al 2 O 3 was investigated by temperature-programmed reduction (TPR) and adsorption of H2 and of O2.

TL;DR: In this paper, a chain growth scheme for the synthesis of alcohols from carbon monoxide and hydrogen is proposed, assuming one or two carbon addition at the α- or β-carbon atom of the growing alcohol.

TL;DR: In this paper, the adsorption of H 2 and CO was investigated on SiO 2 and La 2 O 3-supported Pd catalysts, and the structure of adsorbed CO was characterized by infrared spectroscopy.

TL;DR: In this article, the adsorption of CO, CO2, H2, HCOOH, and CH3OH was studied over ZrO2 using FTIR and Bicarbonate, formate, and methoxide species were observed.

TL;DR: In this paper, the authors characterized several Mo and CoMo catalysts on different supports, previously evaluated for thiophene hydrodesulfurization (HDS) and 1-hexene hydrogenation (HYD) activities, were characterized for Mo dispersion in the catalysts.

TL;DR: In this article, photoacoustic spectroscopy has been applied in the infrared region to the characterization of a number of heteropoly compounds which show interesting trends in activity and selectivity in the conversion of methanol to hydrocarbons.

TL;DR: The surface structure and temperature dependence of n-hexane skeletal rearrangement was investigated near atmospheric pressure and at 520-700 K over a series of five platinum single crystal surfaces with variable terrace, step, and kink structures as discussed by the authors.

TL;DR: The adsorption of water and methanol on H-ZSM-5 has been characterized by temperature-programmed desorption (TPD), thermogravimetric analysis, and transmission infrared spectroscopy as discussed by the authors.

TL;DR: In this paper, the influence of the ammonia/propylene feed ratio on the acrylonitrile/acrolein product ratio for bismuth molybdate-based catalysts indicates the presence of two mechanistic regimes.

TL;DR: In this article, the dispersion of the Pd has been determined by adsorption of H 2 and CO, and the catalytic activity of Pd TiO 2 and Pd SiO 2 catalysts was determined for the hydrogenolysis of ethane and for the CO H 2 reaction.