The Influence of the Rhodium Content in Platinum Catalysts and of the Gold Content in Nickel Catalysts on the Course of the CO + NO Reaction

With ever-increasing demands linked with decreasing sulphur levels in gasoline fuels, base metal catalysts have become attractive as alternatives. The Ni-Au system is an interesting alloy for use in the reaction between CO and NO, partly because of the large difference between the heats of chemisorption of NO and CO on the two metals. This paper presents a study of the course of NO reduction by CO which additionally made it possible to trace changes in the activity and selectivity of the process for alloys of varied Ni-Au composition and alloys of varied Pt-Rh composition together with the effects of Pt and Rh dispersion and the concentration of B 5 sites on the surface of the Pt and Rh catalysts

The Influence of the Physicochemical Properties of Supported Nickel Catalysts Obtained by the Double-Impregnation Method on the Hydrogenolysis of n-Butane

All catalysts examined were obtained by the double-impregnation method. The influence of nickel dispersity on the catalytic activity and selectivity of alumina-supported catalyst was observed. The reaction rate attained a maximum value at mean nickel crystallite sizes between 1.5 nm and 1.6 nm. The selectivity towards methane was highest in the same crystallite size range. At crystallite sizes below 1.5 nm, the selectivity towards i-butane increased while that towards ethylene reached a value of 60% in the same size range

Influence of the Vanadium and Zinc Contents in DESONOX Catalysts on the Course of the DESOX Reaction

The catalytic process of SO 2 removal from combustion gases takes place on the grain plane of hard coal. This process is competitive relative to classical desulphurization processes. The method proposed for the removal of SO 2 from combustion gases described in this paper is quite different from wet classical desulphurization methods. This paper reports studies of the influence of vanadium and zinc concentration on the catalytic activity of a number of DESONOX catalysts (in the course of the DESOX reaction). Investigations of the influence of the total surface area and other physicochemical properties of the catalyst on its behaviour are also reported

Influence of Palladium Crystallite Size on the Course of the DENOX Reaction

Catalysis is one of the important fields in the industry where small metal particles are applied. The effect of the metal crystallite size in the catalytic reduction process has investigated for palladium, the present paper reporting on the effect of the Pd dispersion on the course of the reaction between NO and CO. Such studies also allowed changes in the activity and selectivity of the process and the concentration of B 5 sites on the surface of Pd catalysts to be traced

Influence of Added Molybdenum on the Activity of DESONOX Catalysts

The catalytic removal of SO 2 from combustion gases has been studied on the grain plane of a hard coal, being competitive with classical desulphurization processes. The method proposed for the removal of SO 2 from combustion gases described in this paper is quite different from wet classical desulphurization methods. Studies of the influence of molybdenum concentration on the catalytic activity of a number of DESONOX catalysts are reported. The influence of the total surface area and other physicochemical properties of the catalyst on its behaviour have been studied

Hydrogenolysis of n-Butane over Ru/AlO Catalysts

Preliminary studies were undertaken of the preparation parameters of DIM (double impregnation method) influencing metal loading, ruthenium catalyst dispersion and n-butane hydrogenolysis. Ruthenium red was used as the metal precursor of Ru/Al 2 O 3 catalysts. The infrared spectra of ruthenium red and EDTA adsorbed on alumina indicated that interaction occurs between adsorbates and the support surface. An extension of the impregnation time by ruthenium red caused a slight shift of the asymmetric –COO − band that may be explained by interaction between ruthenium and adsorbed EDTA. The small change in the –COO − band position was due to the nature of the metal–EDTA bond formed. An increase in metal loading led to an increase in ruthenium dispersion. Measurements of the rate of hydrogenolysis of n-butane were carried out in a gradientless reactor. All kinetic experiments were conducted under conditions where the hydrogen/n-butane molar ratio was 9:1, and involved isothermal determination of the relationship between the n-butane reaction rate and the corresponding degree of conversion (iso-X). The absence of propane and the presence of isobutane (at lower temperature) among the products were discussed