Process for preparing an hydrothermally stable, large crystallite sized, highly crystallite sized, highly crystalline synthetic faujasite zeolite

US6284218A · kind A · utility

Assignee

• Indian Oil Corporation Limited · IN

Inventors

• Mohan Prabhu Kuvettu · Barwala, IN
• Manoranjan Santra · Barwala, IN
• Venkatachalam Krishnan · Faridabad, IN
• Sanjay Kumar Ray · Barwala, IN
• Christopher J · Faridabad, IN
• Ganga Shanker Mishra · Faridabad, IN
• Ram Mohan Thakur · Faridabad, IN
• Satish Makhija · Barwala, IN
• Soban Ghosh · Faridabad, IN

Key dates

• Filing date: Sep 23, 1998
• Grant date: Sep 4, 2001
• Expiry date: Sep 23, 2018

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S423/21
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A synthetic faujasite zeolite and a process for preparing the same which includes forming a reaction mixture consisting essentially of water, a source of silica, a source of alumina, Na.sub.2 O nd nucleation centers, wherein the reaction mixture has molar ratios of constituents including Na.sub.2 O/SiO.sub.2, 0.4-0.9; SiO.sub.2 /Al.sub.2 O.sub.3, 7-13; and H.sub.2 O/Na.sub.2 O, 30-45, and wherein the nucleation centers have molar ratios of constituents including Na.sub.2 O/SiO.sub.2, 0.5-2.0; SiO.sub.2 /Al.sub.2 0.sub.3, 10-20; and H.sub.2 O/Na.sub.2 O, 10-40; and heating the reaction mixture to a temperature ranging from 90 to 110.degree. C. for a time period ranging from 23 to 29 hours to obtain the synthetic faujasite zeolite, wherein the synthetic faujasite zeolite has a crystallite size ranging from 1500 to 2000 .ANG., a particle size ranging from 4000 to 8000 .ANG., and a retention of surface of more than 70% of that of a parent zeolite, when exchanged with ammonia and subjected to hydrothermal treatment at 650.degree. C. for 3 hours and with 100% steam.