Showing papers in "Catalysis Today in 1989"

TL;DR: In this article, the role of the catalyst in each of these reactions, and the occurrence of thermodynamic equilibria restricting the completion of the transformation was demonstrated, where molar yields close to 100% were attained.

TL;DR: In this paper, the changes of the catalytic properties in 1-butanol dehydration of γ-alumina modified by introduction of small amounts (02-20 wt %) of ions: SO 4 2−, PO 4 3−, Cl −, F −, Mg 2+ and Na +.

TL;DR: In this article, a combination of Selective Catalytic Reduction (SCR) and V2O5 catalysts was used to eliminate nitrogen oxides from stationary sources, and the results showed that the reduction of NO to water and nitrogen was enhanced.

TL;DR: In this article, the use of proline as a chiral agent in hydrogenations of α-β unsaturated ketones or acetophenone with palladium on carbon catalysts, producing saturated ketones, or α-phenyl-ethyl-alcohol of 5-60% optical purity.

TL;DR: In this paper, a comparison of the behavior in the oxidative coupling of methane of the oxides of Sm, Dy, Gd, La and Tb with that of a Li/MgO material was made.

TL;DR: In this paper, data on the commercial vanadium oxide-alumina catalyst DN 110, active at low temperature, is presented, and effects of operating temperature, gas composition and space velocity are investigated.

TL;DR: In this article, a new mechanism of methane dehydrodimerization has been proposed; at the first reaction step a fast heterolytic dissociation of methane on base sites takes place.

TL;DR: In this article, the authors describe evaluation studies on processes that directly convert methane to higher hydrocarbons and oxygenates, including base and sensitivity cases, heat and material balance calculations of the thermal and carbon efficiencies, and the process duties.

TL;DR: In this paper, Mn2O3/LA catalysts supported on Laβ-β-Al 2O3 (LA) were prepared starting from ethylene glycolate, carbonyl, citrate precursor and nitrate of manganese.

TL;DR: In this paper, the preparation of bimetallic M-Sn catalysts (M=Rh, Ru and Ni) by reaction of Sn(n-C 4 H 9 ) 4 with M/SiO 2 is described.

TL;DR: In this paper, the authors present a list of the papers of which they were aware up until the time of going to press (January 1989) but no systematic search was made over the last months.

TL;DR: In this article, a quantitative treatment is attempted to determine the anharmonicity constant of that vibration mode from all data presented, and the results of this treatment are applied to the material of N2O.

TL;DR: The evolution of the first and second coordination shells of Ni2+ ions in a nickel ion exchanged silica is monitored by EXAFS at the nickel K edge in the early stages of a Ni/SiO2 catalyst preparation.

TL;DR: In this article, a comparative study of methane oxidation using oxygen and nitrous oxide as oxidants over Sm2O3, 5% Li/Sm 2 O 3, La2O 3 and 5% L 2 O O 3 is presented.

TL;DR: In this article, different vanadia species were identified: crystalline or amorphous V2O5, weakly interacting with the TiO2 surface, and strongly interacting with it; it is present in either the reduced or oxidized (V(V)) state, depending upon the crystalline structure of TiO 2; and an oxidized V(V) species, probably spread over the monolayer.

TL;DR: In this article, the homogeneous gas phase O2-based oxidation of methane was studied in the temperature range, from 500°C to 750°C at methane partial pressures ranging from 3 bar to 40 bar.

TL;DR: In this paper, the authors studied selective catalytic reductions of NO, NO 2 and mixtures of NO and NO 2 over mordenite catalysts and found that the reduction of NO x revealed a maximal conversion at a NO 2 /NO x ratio of 0.5, indicating that the oxidation of NO or the decomposition of NO 2 are the rate limiting step in the overall reduction.

TL;DR: In this article, the role of LiCl-added NiO (LiCl/NiO) was investigated for deep oxidation of CH4 and showed that the catalytically active species on the NiO is a surface compound oxide which has higher valent nickel cations (Ni(2+δ)+ or Ni3+).

TL;DR: In this paper, the partial pressure of hydrogen regulates the coverage of the firmly held hydrocarbons which in turn for geometric/electronic reasons affect the product selectivity, and the only reaction whose selectivity has been observed to increase continuously is fragmentation.

TL;DR: In this article, it has been established that the formation of C2-hydrocarbons over CaO-CaCl2 catalysts involves the participation of atomic chlorine generated by the catalyst surface.

TL;DR: In this article, surface reactions involved in the preparation of alumina supported tin-platinum catalysts with metal-metal interaction were studied and side reactions with partial dehydrogenation of the alkyl groups of the -SnR3 moieties were also evidenced.

TL;DR: Graphite-supported platinum catalysts have been prepared by decomposition of the Pt(dpo)2 complex (dpo=15-diphenyl-1,4-pentadiene-3 one) as mentioned in this paper.

TL;DR: In this article, an n-butane isomerization reaction was studied on H-mordenite and ZrO 2 treated with sulphate ion. But the results showed that both catalysts deactivate with time on stream due to coke formation.

TL;DR: In this paper, the authors examined the importance of further oxidation of the desired C2 products in the oxidative coupling of methane, ethylene and ethane have been added to the feed (containing methane and oxygen) to a Li/MgO or Ca/Sm2O3 catalyst.

TL;DR: In this paper, the influence of reaction temperature, space velocity and methane and oxygen partial pressures were studied for the oxidative coupling of methane reaction (OCM) over a lithium doped lanthanum oxide catalyst.

TL;DR: In this paper, a range of catalysts were screened for activity and product selectivities in the pyrolysis of methane, and experiments were performed in a flow reactor at 1125 °C and atmospheric pressure.

TL;DR: In this paper, the dependence of C2+ selectivity on oxygen conversion and on particle size (0.2 mm, 1.4 mm, 4×4 mm) was investigated under conditions of mass transport limitation during the oxidative coupling of methane on a NaOH/CaO catalyst.

TL;DR: In this paper, the effect of the aluminium content on catalytic and physicochemical characteristics of dealuminated mordenites was investigated by means of X-ray diffraction, chemical analysis, adsorption and desorption studies and IR measurements.

TL;DR: In this paper, experiments were carried out with three reaction products: ethane, ethylene and carbon monoxide, and the effect of admixing them to a methane/oxygen feed was investigated.