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US 2015/0031911 A1Published application
Post-Gilding of PD-AU-Coated Shell Catalysts
AssigneeClariant Produkte (Deutschland) GmbH
InventorsGerhard Mestl, Peter Scheck, Alfred Hagemeyer, Carolin Fischer, Roman Bobka
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Abstract
The invention relates to a method for producing a shell catalyst that is suitable for producing vinyl acetate monomer (VAM). The invention further relates to a shell catalyst that is obtainable by the method according to the invention and to the use of the shell catalyst according to the invention for producing VAM.
Claims17
A process for producing an eggshell catalyst, comprising the steps of:
- (a) subjecting a bed of a catalyst support body to a circulating motion;
- (b) contacting an atomized aqueous solution comprising a Pd-containing precursor compound and an Au-containing precursor compound with the bed of the catalyst support body subjected to the circulating motion by spraying, or contacting an atomized aqueous solution comprising a Pd-containing precursor compound and an atomized aqueous solution comprising an Au-containing precursor compound with the bed of the catalyst support body subjected to the circulating motion by spraying;
- (c) contacting an atomized aqueous solution comprising an Au-containing precursor compound with the catalyst support body obtained after step (b);
- and
- (d) metal reduction by subjecting the catalyst support body obtained in step (c) to a thermal treatment in a nonoxidizing atmosphere.
2 more elements
An eggshell catalyst made a process comprising the steps of
- (a) subjecting a bed of a catalyst support body to a circulating motion;
- (b) contacting an atomized aqueous solution comprising a Pd-containing precursor compound and an Au-containing precursor compound with the bed of the catalyst support body subjected to the circulating motion by spraying, or contacting an atomized aqueous solution comprising a Pd-containing precursor compound and an atomized aqueous solution comprising an Au-containing precursor compound with the bed of the catalyst support body subjected to the circulating motion by spraying;
- (c) contacting an atomized aqueous solution comprising an Au-containing precursor compound with the catalyst support body obtained after step (b);
- and
- (d) metal reduction by subjecting the catalyst support body obtained in step (c) to a thermal treatment in a nonoxidizinq atmosphere.
2 more elements
Dependencies are inferred from the claim text.