Zeolite catalyst and preparation process for NO.sub.x reduction
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United States of America Patent
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May 23, 2006
Grant Date -
Sep 2, 2004
app pub date -
Nov 26, 2003
filing date -
Feb 27, 2003
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Abstract
A zeolite catalyst and a process for preparing a zeolite catalyst which is both capable of catalyzing the removal of nitrogen oxides from a gaseous medium across a broad temperature range and is operationally and hydrothermally stable at high reaction temperatures. The zeolite catalyst includes a zeolite carrier having a mole ratio of typically from about 14 to about 95 and copper ions supported on the zeolite carrier. The zeolite catalyst is prepared by providing a zeolite carrier, reacting copper with the zeolite carrier by carrying out an ion exchange reaction in a cupric salt aqueous solution at a temperature of between about 4.degree. C. and room temperature (25.degree. C.), and then drying and calcining the catalyst.
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