Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acid esters
Patent
1998-06-03
2000-05-30
Geist, Gary
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acid esters
502330, 502170, 20415741, C07C 6705, B01J 3100
Patent
active
060692685
ABSTRACT:
The invention relates to a process for producing supported shell catalysts comprising noble metals by UV photoreduction of noble metal salt precursors fixed to a support. For this purpose, the shaped supported body is impregnated with suitable noble metal salts which are then reduced to the metals in a zone close to the surface by means of UV radiation, preferably in the absence of a chemical reducing agent. The metal salts in the interior of the pellets which have not been irradiated and therefore have not been reduced are extracted using a solvent.
The noble metal shell catalysts produced in this way can be used for many heterogeneously catalyzed reactions such as hydrogenations and oxidations.
According to the invention, Pd/Au shell catalysts on porous ceramic supports, e.g. SiO.sub.2 shaped bodies, produced by this process can be used in the synthesis of vinyl acetate.
REFERENCES:
patent: 3627821 (1971-12-01), Sennewald et al.
patent: 4264421 (1981-04-01), Bard et al.
patent: 5185308 (1993-02-01), Bartley et al.
patent: 5260108 (1993-11-01), Braren et al.
Bauerle Dieter
Dingerdissen Uwe
Hagemeyer Alfred
Heitz Johannes
Kuhlein Klaus
Celanese GmbH
Deemie Robert W.
Geist Gary
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