Patent ID: 11857953

Abstract:
A method of making a boronated zeolite catalyst includes preparing an initial slurry comprising water, a shape selective zeolite, boric acid, and a weak acid selected from the group consisting of oxalic acid, citric acid, and oxalic acid and citric acid, hydrothermally treating the initial slurry at a temperature of from 70° C. to 90° C. to produce a hydrothermally treated slurry comprising dealuminated zeolite particles, adjusting the pH of the hydrothermally treated slurry to an intermediate pH of from 8 to 9 to produce a basic slurry, after adjusting the pH to the intermediate pH, hydrothermally treating the basic slurry at a temperature of from 70° C. to 90° C. to produce a boronated zeolite slurry, removing liquids from the boronated zeolite slurry to produce a boronated zeolite filtrate, and drying and calcining the boronated zeolite filtrate to produce the boronated zeolite catalyst.