Pentasil-type molecular sieve containing composition and its pre

Details Pentasil-type molecular sieve containing composition and its pre Pentasil-type molecular sieve containing composition and its pre

1998-09-17

2000-06-27

Dunn, Tom

Catalyst, solid sorbent, or support therefor: product or process

Zeolite or clay, including gallium analogs

And group viii containing

502 64, 502 66, 502 71, 502 77, B01J 2940

Patent

active

060806982

ABSTRACT:
A molecular sieve containing composition, which can be applied in catalytic cracking reaction for producing more ethylene and propylene, and its preparation method. The composition contains a pentasil-type molecular sieve having a SiO.sub.2 /Al.sub.2 O.sub.3 molar ratio of 15-60, prepared by activation and modification with phosphorus, alkaline earth metal and transition metal. The composition essentially includes 85.about.98% wt of pentasil-type molecular sieve, 1.about.10% wt of P.sub.2 O.sub.5, 0.3.about.5% wt of alkaline earth oxide, and 0.3.about.5% wt of transition metal oxide. The molecular sieve structure and active centers have high thermal and hydrothermal stability. The salient feature of this composition is that when applied as an active component of cracking catalyst for catalytic pyrolysis process, the yield of ethylene is above 18% and the total yield of ethylene and propylene is more than 40%.

REFERENCES:
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patent: 4581215 (1986-04-01), Kaeding
XP002088540, Database WPI, Section Ch, Week 9427, Class E17, AN 94-221804 (1994).
XP002088526, Database WPI. Section Ch, Week 8943, Class A41, AN 89-312268 (1989).
XP-002088525, Database Compendex Engineering Information, Inc. Chen Lianzhang et al.: "Modified ZSM Catalysts for Increasing P-Xylene Selectivity in Toluene Disporportionation Reaction," New York, NY (Jun. 1987).
Abstract of JP 60 77,123 (JP 85 77,123) 1985.
Abstract of JP 60 71,519 (85 71,519) 1985.

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