| 摘要 |
1. A polyvalent bifunctional catalyst characterized by the fact that it comprises an oxide or a mixture of metallic oxides of MO2 type, wherein M is selected from the group consisting of molybdenum and tungsten and said oxide or a mixture of oxides are deposited on a support TiO2, wherein a catalyst is characterized by both metallic and acid character by MO2 obtained by the reduction of corresponding oxide MO3, which are deposited as a number of atomic layers between 1 to 8, preferably 5, on a support TiO2, the reduction process takes place under a gaseous flux containing at least hydrogen at temperatures between 380 degree C and 550 degree C, particularly at temperature about 400 degree C in case of MoO2 and at temperature 510 degree C in case of WO2, wherein this reduction process having no effect on the number of layers. 2. A catalyst corresponding to any of the claims from 1 to 4, which is characterized by the fact that the metallic oxide(s) MoO3, which are reduced to MO2 are deposited on a support TiO2 which itself could be deposited on a substrate having larger surface area than TiO2. 3. A catalyst corresponding to claim 5 characterized by the fact that the said substrate is preferably selected from the group consisting of SiO2, Al2O3 or a zeolite. 4. A catalyst corresponding to any of the claims from 1-3 characterized by the fact that the reduction process takes place under a gaseous flux during at least 6 hours, at a flow rate between 0.010 l/min and 0.050 1/min, preferably 0.030 1/min, with a volume between 90% and 100% of hydrogen, preferably 99% hydrogen. 5. A catalyst corresponding to any of claims 1-4 characterized by the fact that the reduction takes place under a gaseous flux containing hydrogen and a gaseous hydrocarbon compound, which undergoes a chemical reaction using this catalyst. 6. A catalyst corresponding to claim 5 characterized by the fact that the gaseous hydrocarbon is present under a partial pressure range between 666.6 Pa and 1999.8 Pa, preferably 799.9 Pa. 7. A catalyst corresponding to any of the claims 1-6 characterized by the fact that it contains in weight from 5.4% to 27% of MoO3, which corresponds to 4.8% to 24% in weight of MoO2. 8. A catalyst corresponding to any of the claims 1-7 characterized by the fact that it contains in weight between 6% and 30% of WO3, which corresponds to 5.7% to 28% in weight of WO2. 9. The use of a catalyst corresponding to any of the claims 1-8 characterized by the fact that this catalyst is used in the reaction of isomerization, hydrogenation, dehydrogenation and/or hydrogenolysis of saturated hydrocarbons, especially alkanes. 10. The use of a catalyst corresponding to any of the claims 1-8 characterized by the fact that this catalyst is used in the reaction of isomerization, dehydrogenation, hydrogenation and/or hydrogenolysis of mono or poly unsaturated hydrocarbons, especially alkenes and alkynes.
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