CATALYST, DEVICE FOR REMOVING NITROGEN OXIDE, AND SYSTEM FOR REMOVING NITROGEN OXIDE
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United States of America Patent
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Issued Date -
Jan 9, 2014
app pub date -
Jan 31, 2012
filing date -
Mar 8, 2011
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Abandoned
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Abstract
To provide an exhaust gas purification catalyst which has high nitrogen oxide removal performance at both an exhaust gas temperature of 200° C. or lower and an exhaust gas temperature of 500° C. or higher and high durability to the repetitive adsorption and desorption of water vapor. A catalyst contains zeolite having a framework structure containing at least aluminum atoms, phosphorus atoms, and silicon atoms and metal supported on the zeolite. The integrated intensity area of a signal intensity of −130 ppm to −92.5 ppm is 41% or more of the integrated intensity area of a signal intensity of −130 ppm to −50 ppm in the case of measuring a solid-state 29Si-DD/MAS-NMR spectrum after water adsorption.
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