Showing papers in "Journal of Catalysis in 1992"

TL;DR: In this paper, the production of H2 and CO by catalytic partial oxidation of CH4 in air at atmospheric pressure has been examined over Pt and Pt-Rh coated monoliths at residence times between 10−4 and 1−2 sec.

TL;DR: In this paper, metal dispersion and support effects on Fischer-Tropsch synthesis rate and selectivity were studied at conditions that favor the information of C5+ hydrocarbons (> 80% selectivity).

TL;DR: In this article, photocatalyzed degradations of trace levels of various oxygenates and an aromatic in air were carried out using near-UV-illuminated titanium dioxide (anatase) powder.

TL;DR: In this paper, an XPS/UPS surface analysis instrument with a micro-reactor allowed the investigation of the surface composition of catalysts characterized by varying activities and selectivities.

TL;DR: The properties of titanium silicalite (TS-1) in reactions with water, hydrogen peroxide, and alcohol molecules have been studied by means of IR and NMR spectroscopy, and acid activity tests.

TL;DR: In this paper, the authors applied pyridine as a method for studying the acidic properties of niobium pentoxide supported on silica, magnesia, alumina, titania, and zirconia.

TL;DR: In this paper, the interaction of nitric oxide with copper ZSM5 zeolites at room temperature has been studied by EPR and FT-IR spectroscopy in the aim of investigating the surface intermediates involved in the decomposition of NO to N2 and O2.

TL;DR: In this article, the authors carried out the condensation of benzaldehyde with activated methylenic groups with different pK values, in the presence of a MgAl hydrotalcite catalyst.

TL;DR: In this paper, a titanium silicate with MEL structure (titanium silicalite-2, TS-2) was obtained for the first time in these laboratories and subsequently by others.

TL;DR: In this paper, an equilibrium polymerization model is proposed to account for the observed concentration of vanadia species, which leads to an initial polymer size of ∼2 at low loadings, consistent with the formation of dimeric species.

TL;DR: A kinetic model of the water gas shift reaction based on a description of its elementary steps at the atomic level is presented in this article, which is successfully tested against kinetic data for a working Cu-based catalyst.

TL;DR: The support and promoter effects of Ru in ammonia synthesis were studied systematically using Ru carbonyl, Ru3(CO)12, as a precursor of the Ru catalyst as discussed by the authors.

TL;DR: In this article, it was shown that at 496°C, the relative rates of decomposition of the carbonium ion to give H2 + butenes, methane + propylene, and ethane + ethylene are 30 ± 6, 36 ± 4, and 34 ± 5, respectively, with corresponding activation energies all being approximately 140 kJ/mol.

TL;DR: In this paper, the effect of catalytic structure on the activity and selectivity of TiO2 (anatase)-supported V2O5 for the selective catalytic reduction of NO by NH3 has been investigated.

TL;DR: In this article, the activity of Pt,Rh,Ce/γ-Al2O3 and Pt, Rh/CeO2 catalysts has been studied in a full complement synthetic exhaust gas mixture consisting of H2, CO, C3H6,C3H8, NO, O2, N2, H2O, and SO2.

TL;DR: In this article, an in situ laser Raman spectroscopy (LRS) cell has been constructed in order to study the evolution of the local structure of the vanadium phosphate catalysts for n-butane oxidation to maleic anhydride in catalytic conditions.

TL;DR: In this paper, reaction regulation by intermediate-reactant interaction in the water-gas shift reaction (H2O + CO → H2 + CO2; WGSR) on CeO2 was investigated in relation to the reactant-promoted mechanism on MgO and ZnO by FT-IR.

TL;DR: In this article, the catalytic properties of high specific surface area (> 150 m[sup 2]/g) molybdenum and tungsten carbides are studied in hydrocarbon-reforming reactions and compared to conventional platinum supported on alumina.

TL;DR: In this paper, a semi-batch liquid phase liquid phase oxidation of phenol in an aqueous solution was studied in a semibatch slurry reactor and a solid catalyst comprising ZnO, CuO, and A1203 was found to be effective for converting phenol to nontoxic compounds via different intermediate products at pressures slightly above atmospheric and temperatures below 130°C.

TL;DR: In this paper, a low-temperature conversion route toward ethane, propane, butane, and pentane without using oxygen is described, where the overall reaction consists of two steps.

TL;DR: In this paper, the influence of preparation method, calcination temperature, and Mg : Al atomic ratio on the basic properties of calcined hydrotalcites was investigated.

TL;DR: In this paper, Monte Carlo simulations of single-file systems are used to study mass transfer and chemical reaction in channels in which the individual molecules cannot pass each other (single file systems).

TL;DR: A series of nickel-aluminum mixed hydroxides was prepared by coprecipitation and their structure and composition was examined by X-ray diffraction and thermal analysis as mentioned in this paper.

TL;DR: In this paper, gold catalysts supported on amorphous zirconia have been prepared by coprecipitation, and they exhibit a high initial CO oxidation activity, which is due to a synergy between the ZIRconia and the supported gold particles.

TL;DR: In this article, CO was adsorbed at 77 K on two Na-ZSM-5 zeolites which had Si/Al = 14 and Si/al = 35, respectively, and two intense absorptions centered at 2178 and 2138 cm−1.

TL;DR: In this article, the authors proposed that rate-limiting hydrogen desorption steps, and the high surface hydrogen fugacities that result, control the rate and selectivity of dehydrogenation and related reactions on many nonmetal surfaces.

TL;DR: In this paper, the MAS NMR 27Al spectra of transition aluminas obtained from finely divided precursors gibbsite and boehmite have a line which can be assigned to pentacoordinated AI (AlV).

TL;DR: In this paper, a parent Na, NH4-Y(54) zeolite containing 54 Al/u.c was treated with ammonium hexafluorosilicate (AHFS).

TL;DR: In this article, the reverse water gas shift reaction (RWGS) and the reaction with CO2 alone were carried out over a Cu/ZnO catalyst, and the surface of the catalyst was characterized by N2O titration, XPS, and FT-IR spectroscopy.

TL;DR: In this paper, a thermally stable vanadium-containing silicate with the MEL structure has been prepared by hydrothermal crystallization, and a plausible environment of vanadium at defect sites in the mEL lattice is suggested.