Highly heat resistant .beta.-zeolite and absorbent for automobile exhaust gas purification and adsorbent for automobile exhaust gas purification
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United States of America Patent
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Sep 25, 2001
Grant Date -
Jul 19, 2001
app pub date -
Nov 6, 1998
filing date -
Nov 7, 1997
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Abstract
A highly heat-resistant and hydrothermal-resistant .beta.-zeolite having a SiO.sub.2 /Al.sub.2 O.sub.3 ratio of 80 or more, which is constituted by primary particles having an average particle diameter of 30 nm or more or by primary particles having such a particle size distribution that the 10% particle diameter is 20 nm or more; and an adsorbent for automobile exhaust gas purification, using said .beta.-zeolite. The .beta.-zeolite and the adsorbent can be produced reliably so as to have guaranteed properties.
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