CATALYST, A METHOD FOR ITS PREPARATION AND A METHOD FOR PREPARING N-(PHOSPHONOMETHYL)-GLICINE Russian patent published in 2018 - IPC B01J23/52 B01J37/02 B01J37/18 C07F9/38 

FIELD: technological processes.

SUBSTANCE: invention relates to the field of preparing metal-carbon compositions, which are gold nanoparticles applied to a surface of porous carbon carriers, and that can be used as catalysts for the preparation of N-(phosphonomethyl)-glycine, C₃H₈NO₅P by oxidation of N-substituted-N-(phosphonomethyl)-glycines with hydrogen peroxide. Catalyst is described, which contains 0.5–3 % by weight of gold, which is predominantly in the form of particles 1–2.5 nm in size (the mass fraction of particles larger than 3 nm detected by X-ray diffraction analysis does not exceed a quarter of the total amount of metal applied). Method for the preparation of Au/C catalysts, which consists in the quantitative fixation of gold compounds to the surface of the carbon carrier by their adsorption from alkaline solutions prepared by mixing aqueous solutions of HAuCl₄, alkali (Na₂CO₃) and diaminomonocarboxylic amino acids (lysine, arginine), at room temperature, followed by heating the slurry and removing the weakly adsorbing mother liquor components that do not contain a precious metal, with distilled water, drying and reducing the sample with hydrogen at 150–200 °C.

EFFECT: technical result consists in a high efficiency preparation of N-(phosphonomethyl)-glycine in the synthesis.

6 cl, 2 dwg, 7 tbl, 19 ex