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1.
Five series of Pt–Pd/C catalysts were prepared with different total metal loading and different atomic composition in Pt and Pd. The activity in electrooxidation of hydrogen were measured for all these catalysts. Electrooxidation of hydrogen is a structure insensitive reaction on platinum and a structure sensitive reaction on palladium. For bimetallic catalysts, curves of activity as a function of the composition of the catalyst can exhibit a maximum. Yet, metal loading can alter the atomic composition at which activities are maxima.
Pt–Pd/C Pt Pd. . - - . . , .相似文献
2.
The catalytic properties of binary oxide systems based on -aluminium oxide. with the general formula Al2–xMexO3, where Ox2 and Me=chromium, iron, gallium, lanthanum, have been investigated in hydrogen oxidation. An extremal type of correlation between catalytic properties and composition is shown.
- Al2–xMexO3, 0x2 Me=, , , , . .相似文献
3.
Aged and fresh samples of sodium metaperiodate are subjected to thermal decomposition studies in air by TG, DTG and DTA techniques. The kinetic parameters for their decomposition have been evaluated by weighted least squares method using equations of Coats-Redfern, Horowitz-Metzger and Freeman-Carroll. The results indicate that, within the limits of experimental error, ageing did not change the E* values considerably.
, . , -, - -. , , , E*.相似文献
4.
Desorption of hydrogen liberated in the process of water decomposition on bimetallic catalysts (3% Ir–Fe/Al2O3) at linear temperature growth was observed. In the case of iridium the amounts of desorbing hydrogen are relatively small, whereas for iron they are many times greater.
, 3% Ir–Fe/Al2O3 . , , .相似文献
5.
M. Cannizzaro P. Forzatti I. Pasquon P. L. Villa 《Reaction Kinetics and Catalysis Letters》1981,17(1-2):57-62
Data obtained in a flow reactor show that iron(III) molybdate doped by bismuth can oxidize propylene to acrylic acid directly in one step. Part of the catalyst works in a partially reduced form and in the preparation of the catalyst the surface acidity must be controlled.
, , (III), , . .相似文献
6.
Conversion of methanol to hydrocarbons was studied on an amorphous silica-alumina over the 330–420°C temperature range and contact times up to 8 h. The reaction was confirmed as autocatalytic from the results of varying both contact time and temperature.
330–420°C 8 . , , , .相似文献
7.
R. Kieffer J. P. Hindermann R. El Bacha A. Kiennemann A. Deluzarche 《Reaction Kinetics and Catalysis Letters》1982,21(1-2):17-21
By chemical trapping, an acyl species has been evidenced in the oxidation of alcohols to carboxylate on an alumina surface. A possible reacton scheme is discussed.
. .相似文献
8.
《Reaction Kinetics and Catalysis Letters》1982,20(1-2):47-51
, , , : , , -, 100%. .
The liquid phase hydrogenation of furylcyclopropane at high hydrogen pressure in the presence of ruthenium catalysts is highly selective, yielding tetrahydrofurylcyclopropane. Hydrogenation in the presence of Pd catalysts affords n-propylcyclopropane. Platinum and rhodium catalysts occupy an intermediate position.相似文献
9.
The exchange of C3D6 with hydroxylated and partially dehydroxylated HY zeolites was studied by the analysis of the gas (MS) and the solid (IR) phase at 300°C and at the temperature of the IR beam.
C3D6 HY () () 300°C .相似文献
10.
The hydrodenitrogenation of 1,2,3,4-tetrahydroquinoline was carried out in a flow reactor (350 °C, 35 atm) over CoMo/Al2O3 and NiMo/Al2O3. It is shown that in both cases the addition of hydrogen sulfide to the feed promotes denitrogenation and inhibits hydrogenation.
1,2,3,4- (350°C, 35 ) CoMo/Al2O3 NiMo/Al2O3. , .相似文献