CATALYTIC ACTIVITY OF THE LANTHANIDE OXIDES FOR THE DEHYDROGENATION OF CYCLOHEXANE

1961 ◽  
Vol 65 (10) ◽  
pp. 1887-1891 ◽  
Author(s):  
C. B. McGough ◽  
G. Houghton
Keyword(s):  
Catalytic Activity ◽  
Lanthanide Oxides ◽  
Dehydrogenation Of Cyclohexane

scholarly journals Physicochemical and Electrical Properties of Praseodymium Oxides

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Sergio Ferro
Keyword(s):  
Catalytic Activity ◽  
Electrical Properties ◽  
Hydrogen Evolution ◽  
Noble Metal ◽  
Hydrogen Evolution Reaction ◽  
Electrode Materials ◽  
Praseodymium Oxide ◽  
Lanthanide Oxides ◽  
New Ideas ◽  
The Stability

The industrial research is continuously looking for novelties that could improve the applied processes, increasing the yields, lowering the costs, or improving the performances. In industrial electrochemistry, one more aspect is the stability of electrode materials, which is generally balanced by the catalytic activity: the higher the latter, the lower the former. A compromise has to be found, and an optimization is often the result of new ideas that completely change the way of thinking. Praseodymium-oxide-based cathodes have been proved to be quite interesting devices: the hydrogen evolution reaction is guaranteed by the presence of a noble metal (platinum and/or rhodium), while the stability and poisoning resistance seem to be strongly improved by the presence of lanthanide oxides.

Influence of lanthanide oxides on the catalytic activity of nickel

2002 ◽  
Vol 232 (1-2) ◽  
pp. 121-128 ◽  
Author(s):  
Andreea Gluhoi ◽  
Petru Mărginean ◽  
Dan Lupu ◽  
Emil Indrea ◽  
Alexandru Radu Biriş
Keyword(s):  
Catalytic Activity ◽  
Lanthanide Oxides

Catalytic Activity of Ni/(P)Ti-HMS Catalysts with Varying Phosphorous Concentration in The reaction Of dehydrogenation of Cyclohexane

1998 ◽  
Vol 549 ◽  
Author(s):  
T. Halachev ◽  
T. Viveros ◽  
G. Perez ◽  
L. Dimitrov
Keyword(s):  
Catalytic Activity ◽  
Surface Properties ◽  
Mesoporous Materials ◽  
Acid Base ◽  
Base Surface ◽  
Cyclohexane Dehydrogenation ◽  
Dehydrogenation Of Cyclohexane ◽  
Phosphorous Concentration

AbstractNi/(P)Ti-HMS catalysts were prepared and characterized by several physicochernical techniques. The addition of phosphorous to the original mesoporous materials modified the acid-base surface properties. The activity in cyclohexane dehydrogenation is higher than on conventional catalysts.

Sonochemical Synthesis and Catalytic Properties of Nanostructured Molybdenum Carbide

1994 ◽  
Vol 351 ◽  
Author(s):  
Kenneth S. Suslick ◽  
Taeghwan Hyeon ◽  
Mingming Fang ◽  
Andrzej A. Cichowlas
Keyword(s):  
Catalytic Activity ◽  
Molybdenum Carbide ◽  
Gas Adsorption ◽  
High Surface ◽  
High Surface Area ◽  
Face Centered Cubic ◽  
Excess Carbon ◽  
Dehydrogenation Of Cyclohexane ◽  
Good Catalytic Activity ◽  
Face Centered

ABSTRACTMolybdenum hexacarbonyl in hexadecane was irradiated with high intensity ultrasound under argon at 90°C to yield face centered cubic molybdenum carbide, Mo2C. After thermal treatment, oxygen and excess carbon were removed to give stoichiometric Mo2C. SEM micrographs showed that the surface was extremely porous. TEM micrographs showed that the solid was an aggregate of particles with diameters of ≈ 2 nm. This material has a very high surface area, 188 m2/g as determined by BET gas adsorption. Catalytic studies have been conducted on the dehydrogenation of cyclohexane and the hydrogenolysis of ethane. The sonochemically prepared Mo2C shows good catalytic activity for the dehydrogenation of cyclohexane with 100% selectivity for formation of benzene without hydrogenolysis to methane. The material revealed poor catalytic activity for the hydrogenolysis of ethane.

Nanostructured Fe-Co Catalysts Generated by Ultrasound

1994 ◽  
Vol 351 ◽  
Author(s):  
Kenneth S. Suslick ◽  
Mingming Fang ◽  
Taeghwan Hyeon ◽  
Andrzej A. Cichowlas
Keyword(s):  
Catalytic Activity ◽  
High Surface ◽  
Pure Metal ◽  
High Catalytic Activity ◽  
Small Surface ◽  
Co Catalysts ◽  
Surface Areas ◽  
Alloy Particles ◽  
Dehydrogenation Of Cyclohexane ◽  
Co Alloys

ABSTRACTBimetallic catalysts have been studied intensively because of their unique activity and selectivity. Unsupported alloy catalysts, however, are usually of limited value due to their very small surface areas. We have now developed a sonochemical synthesis of bimetallic alloys that provides both high surface areas and high catalytic activity. We have produced Fe-Co alloys by ultrasonic irradiation of mixed solutions of Fe(CO)5 and Co(CO)3(NO) in hydrocarbon solvents. The alloy composition can be controlled simply by changing the ratio of precursor concentrations. After treatment at 673K under H2 flow for 2 hours, we obtain nearly pure alloys. BET results show that the surface areas of these alloys are large (10-30 m2/g). TEM and SEM show that the alloy particles are porous agglomerates of particles with diameters of 10-20 nm. Sonochemically prepared Fe, Co, and Fe-Co powders have very high catalytic activity for dehydrogenation and hydrogenolysis of cyclohexane. Furthermore, sonochemically prepared Fe-Co alloys show high catalytic selectivity for dehydrogenation of cyclohexane to benzene; the 1:1 ratio alloy has much higher selectivity for dehydrogenation over hydrogenolysis than either pure metal.

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