USO DE UN CATALIZADOR SUPLEMENTARIO EN COMBINACION CON UN CATALIZADOR QUE CONTIENE METAL NOBLE SOPORTADO EN CARBONO EN REACCIONES DE OXIDACION EN FASE LIQUIDA

Un procedimiento para fabricar un sistema de catalizador de oxidación, comprendiendo el procedimiento la mezcla de un catalizador que contiene un metal noble con un promotor suplementario en presencia de ácido N- (fosfonometil)iminodiacético o una sal del mismo y ácido fórmico o formaldehído, en el que el catalizador que contiene un metal noble comprende un metal noble y un soporte de carbono; y la relación de masa del promotor suplementario al catalizador que contiene el metal noble es al menos 1:15.000. This invention relates to the use of a supplemental promoter in conjunction with a noble-metal-containing catalyst comprising a carbon support in catalyzing liquid phase oxidation reactions, a process for making of an improved catalyst comprising such a supplemental promoter, and an improved catalyst comprising such a supplemental promoter. In a particularly preferred embodiment, a supplemental promoter (most preferably bismuth or tellurium) is used in conjunction with a noble-metal-containing catalyst comprising a carbon support in a liquid phase oxidation process wherein N-(phosphonomethyl)iminodiacetic acid (i.e., "PMIDA") or a salt thereof is oxidized to form N-(phosphonomethyl)glycine (i.e., "glyphosate") or a salt thereof. The benefits of such a process include increased oxidation of the formaldehyde and formic acid by-products, and, consequently, decreased final concentrations of those by-products as well as other undesirable by-products, most notably N-methyl-N(phosphonomethyl)glycine (i.e., "NMG").