The invention relates to a method for producing shell catalysts for the catalytic vapor-phase oxidation of aromatic carboxylic acids and/or carboxylic acid anhydrides comprised of a supporting core and of catalytically active metal oxides which are deposited in a shell-shaped manner on said supporting core. The inventive catalysts are obtained by spraying an aqueous active mass suspension, said suspension containing the active metal oxides, at higher temperatures onto the hot supporting material which has a temperature ranging from 50 to 450 °C. The aqueous active mass suspension contains 1 to 10 wt. %, with regard to the solid content of the active mass suspension, of a binding agent comprised of A) a polymerizate obtained by radical polymerization, containing 5 to 100 wt. % of monomers (a) in the form of ethylenically unsaturated acid anhydrides or ethylenically unsaturated dicarboxylic acids whose carboxyl groups can form an anhydride and containing 0 to 95 wt. % monoethylenically unsaturated monomers (b) with the provision that the monomers (a) and (b) comprise, on average, a maximum of 6 carbon atoms which are not functionalized with groups containing oxygen, and of B) an alkanolamine having at least 2 OH groups, a maximum of 2 nitrogen atoms and a maximum of 8 C-atoms, whereby the weight ratio A:B ranges from 1:0.05 to 1:1.

Method for producing shell catalysts for the catalytic vapor-phase oxidation of aromatic hydrocarbons and catalysts obtained in such a manner

In a process for producing a hydroprocessing catalyst, a particulate metal oxide composition comprising an oxide of at least one first metal selected from Group 6 of the Periodic Table of the Elements can be mixed with particles of a sulfide of at least one second metal selected from Groups 8 to 10 of the Periodic Table of the Elements to produce a particulate catalyst precursor. The particulate catalyst precursor can then be sulfided under conditions sufficient to at least partially convert the particulate catalyst precursor into a layered metal sulfide having defect sites associated with the second metal sulfide.

Hydroprocessing catalysts and their production

This invention relates to supported multi-metallic catalysts for use in the hydroprocessing of hydrocarbon feeds, as well as a method for preparing such catalysts. The catalysts are prepared from a catalyst precursor comprised of at least one Group VIII metal and a Group VI metal and an organic agent selected from the group consisting of amino alcohols and amino acids.

Method of preparing a hydrotreating catalyst on a support containing a rare earth metal

A process for producing a molybdenum-containing metal oxide fluid-bed catalyst comprising, as essential components, (i) at least one element selected from the group consisting of iron, bismuth, and tellurium, (ii) molybdenum, and (iii) silica, which comprises (a) adjusting an aqueous slurry containing a raw material providing element (i), a molybdenum compound, a silica sol, and a chelating agent capable of inhibiting gelation of the slurry of a pH of at least 6, or (b) adjusting an aqueous slurry containing a raw material providing element (i), a molybdenum compound and a chelating agent capable of inhibiting gelation to a pH of at least 6 and mixing the slurry with a silica sol, then spray drying the thus pH-adjusted aqueous slurry, and calcining the resulting particles.

Process for producing molybdenum-containing metal oxide fluid-bed catalyst

A process for preparing acrylic acid from methanol and acetic acid, in which, in a reaction zone A, the methanol is partially oxidized to formaldehyde in a heterogeneously catalyzed gas phase reaction, the product gas mixture A obtained and an acetic acid source are used to obtain a reaction gas input mixture B which comprises acetic acid and formaldehyde and has the acetic acid in excess over the formaldehyde, and the formaldehyde present in reaction gas input mixture B is aldol-condensed to acrylic acid under heterogeneous catalysis in a reaction zone B with acetic acid present in reaction gas input mixture B, and unconverted acetic acid still present alongside the acrylic acid target product in the product gas mixture B obtained is removed therefrom, and the acetic acid removed is recycled into the production of reaction gas input mixture B.

Process for preparing acrylic acid from methanol and acetic acid

Process for manufacturing a supported catalyst whose active phase contains mainly molybdenum and iron by impregnating a carrier with an aqueous solution of alkanolamine and a complex of the active phase elements, drying and thereafter roasting the impregnated carrier.

Philippe Courty

Papers

Supported catalyst for oxidizing methanol to formaldehyde and its manufacturing process

Traeger-katalysator fuer die oxydation von methanol zu formaldehyd und verfahren zu seiner herstellung