Patent ID: 7148381

Claim:
A process comprising ammoximation of a carbonyl compound in the presence of hydrogen peroxide or a compound capable of producing hydrogen peroxide, and a zeolitic catalyst containing titanium having formula (I) xTiO 2 (1−x)SiO 2 (I), wherein x ranges from 0.000 1 to 0.4, said catalyst being obtained by a process which comprises subjecting the catalyst to treatment with an aqueous and/or aqueous-organic solution of an ammonium salt of a mono-, bi-, tri-, tetra-carboxylic acid, linear or branched, with a total number of carbon atoms ranging from 2 to 20, having general formula (II) wherein one of R1, R2, R3 and R4 is a carboxyl group, and the others of R1, R2, R3 and R4, the same or different, are selected from the group consisting of hydrogen, hydroxyl, ether, ester, carbonyl, carboxyl, amine, amide, vinyl, hydro-halogen, nitrile, hydro-sulfide, sulfonic, and phosphoric groups; or are selected from the group consisting of alkyl, cycloalkyl, alkylcycloalkyl, aromatic, alkylaromatic, aralkyl and hetero-aromatic groups, which groups are unsubstituted or substituted with one or more atoms or groups selected from the group consisting of hydrogen, hydroxyl, carboxyl, halogen, alkoxide, amine, ester, amide, vinyl, nitrile, hydroxyl, hydro-sulfide and carbonyl; wherein the central carbon atom of general formula (II) may optionally form a cycle with two adjacent groups from R1, R2, R3 and R4, which cycle is saturated or unsaturated, hetero-aromatic with one or more hetero-atoms selected from the group consisting of N, O, S, or non-hetero-aromatic; which treatment is carried out for a time ranging from 0.2 to 5 hours, at concentrations of ammonium salt ranging from 0.2 to 10% by weight and is followed by the separation of the catalyst by filtration and its calcination at temperatures ranging from 300 to 650° C. for a period of time ranging from 1 to 6 hours.