Chemistry of inorganic compounds – Oxygen or compound thereof – Peroxide
Reexamination Certificate
1999-06-22
2001-10-23
Griffin, Steven P. (Department: 1754)
Chemistry of inorganic compounds
Oxygen or compound thereof
Peroxide
C502S242000, C585S250000, C518S713000, C568S881000
Reexamination Certificate
active
06306359
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to hydrogenation catalysts based on palladium, platinum or rhodium which is deposited on zirconium oxide and silicon oxide supports, to their process of manufacture and to their use in hydrogenation reactions and in particular in preparing hydrogen peroxide.
BACKGROUND OF THE INVENTION
The synthesis of hydrogen peroxide with the involvement of hydrogenation catalysts comprising palladium and silica is a reaction which has been known for a long time. Provision has also already been made in Patent Application EP-A1-0009802 for the preparation of hydrogen peroxide with the involvement of catalysts comprising palladium, zirconium oxide and silica.
Furthermore, Patent Application EP-A1-0149816 discloses specific catalysts based on palladium, zirconium oxide and silica.
SUMMARY OF THE INVENTION
The object of the present invention is to provide other hydrogenation catalysts which exhibit a high and stable catalytic activity.
Another object of the present invention is to provide hydrogenation catalysts which exhibit a high catalytic selectivity. Thus, the catalysts according to the invention, when they are used for the synthesis of hydrogen peroxide by the AO process (auto-oxidation process), limit the formation of decomposition products.
To this end, the invention relates to hydrogenation catalysts based on palladium, platinum or rhodium on a zirconium oxide and silicon oxide support comprising at least one other metal M and/or in which the support is not in the aerogel physical form.
The invention also relates to the process for the manufacture of these catalysts and to the use of these catalysts in hydrogenation reactions and in particular in preparing hydrogen peroxide.
REFERENCES:
patent: 4007256 (1977-02-01), Kim et al.
patent: 4240933 (1980-12-01), Copelin
patent: 4601996 (1986-07-01), Miller
patent: 4937058 (1990-06-01), Dupin et al.
Periodic Table of the Elements, CRC Handbook of Chemistry and Physics, 80th edition 1990-2000.*
Ullman's Encyclopedia of Industrial Chemistry, Fifth Completely Revised Edition, vol. A13: High Performance Fibers to Imidazole and Derivatives, pp. 444, col. 1, last paragraph (1989).
Mathieu Véronique
Pennetreau Pascal
Vanlautem Noel
Griffin Steven P.
Larson & Taylor PLC
Medina Maribel
Solvay Interox (Societe Anon.)
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