Patent ID: 11857953
Assignee: SAUDI ARABIAN OIL COMPANY
Field: Chemical engineering (Chemistry)
Classification: CPC B  C | IPC B  C

Claim 0:
1. A method of making a boronated zeolite catalyst, the method comprising:
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, where the initial slurry has an initial pH of from 1 to 5;
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.