PLATINUM CATALYST, METHOD OF ITS PREPARATION, METHOD OF ITS REGENERATION AND METHOD FOR OBTAINING SULFATE OF HYDROXYLAMINE

摘要

1. A catalyst for the production of hydroxylamine sulfate by the selective hydrogenation of nitric oxide in sulfuric acid, which comprises platinum in an amount of 0.3-1 wt.% Supported on a non-porous or porous carbon support, wherein the deposited platinum is represented in the form of particles with sizes less than 4 nm and more than 80 wt.% of the total amount of platinum metal in the form of concentrated chastits.2 crystallographically amorphous. A method of preparing the catalyst that contains platinum in an amount of 0.3-1 wt.% Supported on a non-porous or porous carbon carrier for the synthesis of hydroxylamine sulfate by the selective hydrogenation of nitric oxide in sulfuric acid medium, comprising applying the two-stage platinum on non-porous or porous carbon support, wherein the first stage consists in the partial surface deposited on the pretreated by heating in aqua regia, platinum oxide carrier by hydrolysis of chloride complexes of Pt (II), floor chennyh action of sodium dithionite NaSOna geksahlorplatinatnye complexes HPtClv medium acetate buffer at pH = 5-7, and the second - doosazhdenii remaining metal from a solution of the action of formic acid HCOOH, characterized in that the duration of the dosing solutions of sodium acetate reagent CHCOCNa, NaSOi HCOOH - at least 0.5 h duration at each stage for at least 3 hours; thus obtained catalysts in which platinum is deposited in an amount of 0.3-1 wt.% is a particle size less than 4 nm and more than 80 wt.% of the total amount of platinum metal is in the form of X-ray amorphous chastits.3. A method according to claim 2, characterized in that the nonporous yl