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# (12) United States Patent 

# Xu et al. 

# (54) IN-SITU ZSM-5 SYNTHESIS 

(75) Inventors: Mingting Xu, Edison, NJ (US); John Macaoay, Linden, NJ (US) 

(73) Assignee: Engelhard Corporation, Iselin, NJ (US) 

( *) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 213 days. 

(21) Appl. No.: 10/452,257 

(22) Filed: Jun. 2, 2003 

## (65) Prior Publication Data 

US 2004/0238407 Al Dec. 2, 2004 

(51) Int. c1.7 . ... ... .. ... ... ... ... .. ... ... ... ... ... .. ... ... .. corn 39/38 

(52) U.S. Cl. ....................... 423/709; 423/712; 423/716; 423/DIG. 22; 208/120.01 

(58) Field of Search ......................... 423/709, DIG. 22, 423/712, 716; 208/120.01 

## (56) References Cited 

<img src='content_image/948237.jpg'>

## U.S. PATENT DOCUMENTS 

<img src='content_image/948249.jpg'>

# (10) Patent No.: US 6,908,603 B2 

# (45) Date of Patent: Jun.21,2005 

<img src='content_image/948240.jpg'>

## FOREIGN PATENT DOCUMENTS 

<img src='content_image/948242.jpg'>

* cited by examiner 

Primary Examiner-David Sample 

(74) Attorney, Agent, or Firm-Raymond F. Keller 

## (57) ABSTRACT 

A novel method of forming ZSM-5 comprises reacting calcined kaolin microspheres with silicate and a seed solu› tion used for forming zeolite Y under conditions of pH, temperature, and time to yield ZSM-5 crystals formed in-situ on said calcined kaolin microspheres. The reaction medium does not contain any organic templates or ZSM-5 seeding crystals. 

US006908603B2 

## 24 Claims, 1 Drawing Sheet 

