Showing papers in "Journal of Catalysis in 1967"

TL;DR: In this paper, a study of the possible cause for sorption hysteresis in the case of cylindrical pores of uniform diameter, open at both ends, is made.

TL;DR: The infrared spectra of ammonium Y zeolite have been observed after calcination at a series of temperatures up to 750 °C, and the concentration of coordinately bound pyridine (Lewis acidity) is low below 475 °C but increases rapidly with increasing calcination temperature.

TL;DR: In this article, a series of noble metals of Group VIII of the Periodic Table (Ruthenium, rhodium, palladium, and iridium) were investigated for hydrogenolysis of ethane.

TL;DR: In this paper, a generalized electronegativity of the metal ion (Xi) was found to increase the acidity and catalytic activity of the catalysts, which is explained by the inductive effect of metal ions in the catalyst.

TL;DR: In this article, an empirical relation is given for the universal t curve of multimolecular nitrogen adsorption, relating the thermodynamic potential of the adsorbed layer at 78 °K to its thickness.

TL;DR: In this paper, the catalytic activity of rhodium for hydrogenolysis has been investigated as a function of the state of dispersion, and the results suggest that catalytic performance ultimately decreases as the dispersion is increased to an extremely high degree.

TL;DR: In this paper, the catalytic properties of various oxides were determined in the oxidation of isobutene, acetylene, ethylene, and propane and were correlated with the heat of formation of the catalyst oxides divided by the number of oxygen atoms in the oxide molecule (ΔHO).

TL;DR: In this article, a mechanistic view of the dehydration of alcohols over alumina to form ethers and olefins was studied from a molecular point of view, and it was shown that both reactions are surface reactions but requiring different types of active sites.

TL;DR: In this article, a study of the conversion of n-butenes into olefins of lower and higher carbon number (dismutation) on catalysts containing cobalt, molybdenum, and aluminum oxides has shown that the product spectrum is markedly affected by doublebond isomerization which accompanies the dismutation.

TL;DR: In this article, the reaction of toluene, n -butane, and n -pentane catalyzed by two crystalline zeolites, mordenite and Y faujasite, was determined as a function of the extent of decomposition of the ammonium zeolite to their hydrogen (Bronsted acid) and hydrogen free (Lewis acid) forms.

TL;DR: In this paper, the surface hydroxyls on silica, alumina, and silica-alumina catalysts were characterized using a closed system under normal nitrogen atmosphere and the volume of ethane produced was measured.

TL;DR: In this paper, the structure of Pt/silica catalysts containing up to 11.5 wt % Pt was determined from X-ray line-broadening measurement of crystallite size, the proportion of platinum detectable by Xray diffraction, and electron micrographs of ultramicrotome sections.

TL;DR: In this article, the reaction of 1-butene with bismuth molybdate, MoO3, and some nonstoichiometric Mo oxides was studied as a function of time and temperature at virtually constant hydrocarbon pressure.

TL;DR: In this article, the coadsorption and interaction of carbon monoxide and hydrogen on a series of unsupported noble metal catalysts was studied in the temperature range 100-200 °C.

TL;DR: In this article, the applicability of linear free energy relationships (LFER) in heterogeneous catalysis to dealkylation of alkylbenzenes was surveyed and a linear relationship between the rate data and some numerical variables which represent either reactivity of reactants or catalytic activity of heterogeneous catalysts.

TL;DR: In this article, infrared spectral data were presented for the adsorption of acetone and acetaldehyde on silica and silica-supported nickel at various temperatures, and the hydrogen-bonded interaction between surface hydroxyl groups and the adsorbate carbonyl groups has been confirmed.

TL;DR: In this paper, the mechanism of the one-step catalytic conversion of ethanol to butadiene on Al2O3:ZnO(60:40) catalyst has been investigated.

TL;DR: In this paper, the formation of ethyl alcohol on η and γ alumina was investigated and it was shown that the rate constants obtained with these materials are correlated with their surface structures.

TL;DR: In this paper, a model of the acid site is introduced in which the bond strengths of acidic hydroxyl groups are perturbed by the polarizing effects of neighboring cations.

TL;DR: In this article, the influence of pore geometry on reaction rate and selectivity in dehydration of ethanol and n-butanol to olefins and ethers over various zeolite catalysts was studied.

TL;DR: In situ X-ray diffraction and differential thermal analysis have been applied to a study of a supported oxide catalyst used in the air oxidation of CO to CO2 as mentioned in this paper, and the results reveal pronounced differences in composition for the variously activated catalysts.

TL;DR: In this paper, a reinvestigation of the reaction between hydrogen and oxygen chemisorbed on supported platinum has established the following stoichiometry for conditions of 25 °C and pressures above about 10 torr: Pt (surface) + 1 2 O2(g) → PtO(surface)

TL;DR: In this paper, the thermal stability and physical properties of activated alumina are studied as a function of the precursor material, a low-temperature, highly amorphous alumina impregnated with varying concentrations of Li +, K +, or Mg 2+.

TL;DR: In this article, a comparative study of the heat of chemisorption of ammonia at 30 °C on various preparations of alumina, silica, and silica-alumina, and Linde molecular sieve X was made.

TL;DR: In this paper, the surface ethoxide on alumina made by ethanol adsorption was desorbed by heat treatment, with the desored species analyzed by mass spectrometry.

TL;DR: In this article, the first order character of both the heterogeneous and depletive oxidation rates for hydrogen and carbon monoxide indicates that the reaction mechanism is a Rideal type and is due to coverage of most of the oxide surface with one of the reactive atomic (H) or radical (CO) species.