Shell catalyst, its use for oxidizing methanol to formaldehyde and its process of preparation

• Main Authors: GUECKEL CHRISTIAN, FISCHER CLAUDIA, ESTENFELDER MARVIN, WANNINGER KLAUS, DUERR UWE
• Format: Patent
• Language: Chinese; English
• Published: 07.01.2009
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; METALLURGY; ORGANIC CHEMISTRY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; THEIR RELEVANT APPARATUS; TRANSPORTING

The invention relates to coated catalyst, in particular for oxidation of methanol to formaldehyde, which has at least one coating on an inert, preferably essentially nonporous, support body, which coating, before removal of the organic fractions of the components b) and c) contains: (a) oxides or precursor compounds which can be converted into the corresponding oxides of molybdenum and iron, wherein the molar ratio of Mo:Fe is between 1:1 and 5:1, and also if appropriate further metallic or metal-oxide components or precursor compounds which can be converted into the corresponding oxides, (b) at least one organic binder, preferably an aqueous dispersion of copolymers, in particular selected from vinyl acetate/vinyl laurate, vinyl acetate/ethylene, vinyl acetate/acrylate, vinyl acetate/maleate, styrene/acrylate or mixtures thereof, and (c) at least one further component selected from the group consisting of SiO2 sol or precursors thereof, A12O3 sol or precursors thereof, ZrO2 sol or precursors thereof, TiO2 so