Showing papers in "Journal of Catalysis in 1981"

TL;DR: The primary effect in the hydrodesulfurization of dibenzothiophene by transition metal sulfides is related to the position the metal occupies in the periodic table.

TL;DR: In this article, infrared spectroscopy and temperature-programmed desorption have been used to investigate the acidic properties of ZSM-5-type zeolites, showing that the most active acidic sites are located at the channel intersections, and the weaker acidic sites correspond to terminal silanol groups on the external surface of the zeolite or possibly nonzeolitic impurities.

TL;DR: In this paper, the structure and type of phases present in sulfided alumina-supported, as well as unsupported, Co-Mo catalysts is obtained from in situ Mossbauer emission spectroscopy (MES) studies.

TL;DR: In this paper, a controlled reduction in the effective dimensions of the catalyst pore openings, and/or channels, along with deactivation of acidic surface sites, has been proposed as a mechanism for the selective production of p-xylene.

TL;DR: In this article, the kinetics of the water gas shift (WGS) reaction as catalyzed by alumina-supported Group VIIB, VIII, and IB metals are examined.

TL;DR: In this article, a series of sulfided Co-Mo Al 2 O 3 catalysts with different Co Mo ratios but with constant molybdenum content was investigated, and it was shown that the relative amounts of the three phases depend strongly on the Co Mo ratio.

TL;DR: The role played by shape-selective properties of the zeolites on their behavior towards coking and aging and also the effect of coking on the availability of Bronsted acidic sites have been particularly emphasized in this paper.

TL;DR: In this article, the synthesis of methane from CO 2 and H 2 was investigated on supported Rh catalysts, and the adsorbed species present on the catalysts were characterized by infrared spectroscopy.

TL;DR: In this paper, a mechanism was proposed where oxides of these elements, present in the zeolites, reduce the dimensions of pore openings and channels sufficiently to favor formation and outward diffusion of p-xylene, the isomer with the smallest minimum dimension.

TL;DR: In this article, a series of bimetallic Pt-Sn/alumina catalysts have been prepared by impregnation of samples of industrial Pt/Alumina reforming catalysts with solutions of Sn(IV) chloride in acetone.

TL;DR: In this article, a series of bimetallic catalysts has been prepared by impregnating a commercial Pt/alumina catalyst (series B catalyst) with solutions containing compounds of tin or lead in aqueous or nonaqueous solvents.

TL;DR: In this paper, the selectivity and ethylene oxide yield of polycrystalline silver can be affected significantly by electrochemical oxygen pumping, and a simple model is proposed in order to explain this new phenomenon.

TL;DR: In this article, the application of H2 chemisorption, X-ray diffraction (XRD) line broadening, and transmission electron microscopy (TEM) to the determination of metal crystallite size and size distribution in Ni SiO 2, Ni Al 2 O 3, and Ni TiO 2 catalysts having wide ranges of nickel loadings and dispersions was investigated.

TL;DR: Several molybdenum compounds were prepared and their catalytic properties in the methanation of CO at 350 °C were investigated and compared with those of nickel and iron as mentioned in this paper.

TL;DR: In this paper, a Library Circulating Copy which may be borrowed for.two weeks is described, and the loaner is required to provide a copy of the book and a reference number.

TL;DR: In this article, 15 amorphous Fe-Ni base alloys containing P and/or B as additives were studied to determine their catalytic activity for the hydrogenation of CO to produce mainly C1 to C3 hydrocarbons.

TL;DR: In this paper, the intrinsic rates and product distributions for CO2 hydrogenation on Ni SiO 2 were determined at 500-575 K, 140-2500 kPa, and a range of space velocities.

TL;DR: In this article, the performance of several silica-supported iron bimetallic and potassium-promoted iron catalysts has been investigated for the conversion of carbon monoxide to hydrocarbons.

TL;DR: The surface hydroxyl concentrations of BaTiO3, Sr TiO3 and LaCoO3 were determined by exchange with D2 as a function of the dehydroxylation temperature as mentioned in this paper.

TL;DR: In this paper, a number of V 2 O 5 TiO 2 catalysts were studied and characterized by surface area, ESCA, and XRD analyses, and they were found to contain V 2 o 5, varying amounts of either rutile or anatase TiO 2, and a solid solution of V 4+ in Ti o 2.

TL;DR: In this paper, a reaction model for Pd is proposed which is consistent with this behavior, with ir spectra of CO adsorbed on these Pd surfaces, and with recent results in the literature on CO hydrogenation.

TL;DR: In this article, the authors present a brief survey of these explanations and experiments whose results should define the catalytic behavior of Fischer-Tropsch synthesis and conclude that the competition model most closely describes catalytic behaviour.

TL;DR: In this article, a comparison of the Raman spectrum of amorphous MoS 3 and poorly crystalline MoS 2 has been performed using infrared and Raman spectroscopies.

TL;DR: In this paper, an infrared reflection-absorption spectrometer (IRRAS) was developed for the measurement of IRRAS, which is a very sensitive technique which can easily detect the vibrational spectra of many adsorbates at submonolayer concentrations on low-area surfaces.

TL;DR: In this paper, the spectral properties of hydroxyl groups in decationized and cationic forms of zeolites, X, Y, and mordenite have been studied for the first time in a wide spectral range, including the fundamental stretching vibrations of OH bonds, their overtones and combination bands.

TL;DR: In this paper, the effect of the activation procedure of Ru SiO 2 catalysts on the activity for benzene hydrogenation was investigated by means of temperature programmed reduction (TPR).

TL;DR: The state of Pt-Sn Al 2 O 3 catalysts with Pt and Sn contents (wt%) 0.47-0.5, and 0.95 -0.2 was studied by tin Mossbauer spectroscopy pointing out the special features of the spectra of some highly dispersed species.