Abstract: Described herein is a Pd- and Au-containing shell catalyst having an improved distribution of Pd. Also described are two processes for producing this catalyst and a process for producing vinyl acetate monomer using this catalyst.

Abstract: The present invention relates to a Pd- and Au-containing shell catalyst which is characterised by an improved Pd and Au distribution. The invention also relates to two methods for producing said catalyst and to a method for producing vinyl acetate monomer using said catalyst.

Abstract: Disclosed is a process for the manufacture of a chromium-containing catalyst with a reduced amount of chromium-(VI)-oxide which process comprises the steps: a) preparing a solid particulate chromium-containing oxidic catalyst comprising Cr-(VD-oxide, b) introducing the solid particulate catalyst into a reactor in which the catalyst particles are mixed using process gas and/or mechanical means, c) introducing a reducing agent for chromium-(VI) into the reactor, d) treating the solid particulate catalyst with the reducing agent in the reactor for a time, at a temperature and at a pressure, so that the chromium-(VI) content in the particulate catalyst is considerably reduced by the reducing agent, and e) discharging the solid particulate catalyst comprising a reduced chromium-(VI) content from the reactor. The disclosed process is simple and efficient and allows manufacture of chromium-containing oxidic catalysts with low content of Cr-(VI)-oxide on an industrial scale.

Abstract: Disclosed is a process for the manufacture of a chromium-containing catalyst with a reduced amount of chromium-(VI)-oxide which process comprises the steps: a) preparing a solid particulate chromium-containing oxidic catalyst comprising Cr-(VI)-oxide, b) introducing the solid particulate catalyst into a reactor in which the catalyst particles are mixed using process gas and/or mechanical means, c) introducing a reducing agent for chromium-(VI) into the reactor, d) treating the solid particulate catalyst with the reducing agent in the reactor for a time, at a temperature and at a pressure, so that the chromium-(VI) content in the particulate catalyst is considerably reduced by the reducing agent, and e) discharging the solid particulate catalyst comprising a reduced chromium-(VI) content from the reactor. The disclosed process is simple and efficient and allows manufacture of chromium-containing oxidic catalysts with low content of Cr-(VI)-oxide on an industrial scale.

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.

Abstract: The present invention relates to a method for producing a shell catalyst that is suitable for producing vinyl acetate monomer (VAM). The present invention also relates to a shell catalyst that can be obtained by the method according to the invention as well as the use of the shell catalyst according to the invention for producing VAM.

Abstract: A method for producing a shell catalyst which is suitable for the synthesis of alkenyl carboxylic acid esters, in particular for producing vinyl acetate monomer (VAM) from ethylene or allyl acetate monomer from propylene by means of oxy-acetylation. Also, a shell catalyst that can be obtained by the method according to the invention, as well as the use of the shell catalyst produced using the method for producing alkenyl carboxylic acid esters, in particular vinyl acetate monomer (VAM) and allyl acetate monomer.

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.

Abstract: The present invention relates to a method for producing a shell catalyst that is suitable for producing vinyl acetate monomer (VAM). The present invention also relates to a shell catalyst that can be obtained by the method according to the invention as well as the use of the shell catalyst according to the invention for producing VAM.

Abstract: A method for producing a shell catalyst which is suitable for the synthesis of alkenyl carboxylic acid esters, in particular for producing vinyl acetate monomer (VAM) from ethylene or allyl acetate monomer from propylene by means of oxy-acetylation. Also, a shell catalyst that can be obtained by the method according to the invention, as well as the use of the shell catalyst produced using the method for producing alkenyl carboxylic acid esters, in particular vinyl acetate monomer (VAM) and allyl acetate monomer.