Patent ID: 7494951

Claim:
A process for the manufacture of catalysts used for producing para-xylene by toluene shape selective alkylation, comprising the steps of e) using silica sol, water glass or sodium silicate as a silica source, aluminium sulphate, sodium meta-aluminate or aluminates as an alumina source, and mixture of organic amine and alcohol or ether in a weight ratio of organic amine/alcohol or ether of 0.05-150 as a template agent to form a synthesis mixture having a molar ratio of SiO 2 /Al 2 O 3 =20-200, H 2 O/SiO 2 =30-140, NH 3 /Al 2 O 3 =1-100, Na 2 O/Al 2 O 3 =0-18, hydrothermally-crystallizing the synthesis mixture at 120-200° C. for 10-200 hours to obtain the liquid product containing ZSM-5 molecular sieves; f) filtering and washing said liquid product containing ZSM-5 molecular sieves from step a), and converting the molecular sieves to NH 4 -type ZSM-5 molecular sieves by ion exchange; g) adding at least one kneading agent selected from the group consisting of silica sol, aqueous organosilicon, silica gel and titanium white to NH 4 -type ZSM-5 molecular sieves from said step b), shaping, drying and calcining to obtain a catalyst matrix; and h) modifying the catalyst matrix with at least one organosilicon selected from the group consisting of phenylmethylpolysiloxane, hydroxyl silicone oil, amino silicon oil and dimethyl silicon oil so as to support organosilicon on the surface of the molecular sieves, calcining at 300-600° C. for 0.5-12 hours, converting organosilicon to inorganic silicon to obtain a catalyst used for producing para-xylene by toluene shape selective alkylation.