Exhaust gas purification catalyst and production method therefor, and method for purifying nitrogen oxide in exhaust gas
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United States of America Patent
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Mar 18, 2014
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Jun 6, 2013
app pub date -
Aug 4, 2011
filing date -
Aug 9, 2010
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Abstract
An exhaust gas purification catalyst is made as a composition comprising titanium oxide (TiO2), aluminum sulfate (Al2(SO4)3), an oxide of vanadium (V), and an oxide of molybdenum (Mo) and/or tungsten (W), wherein on titanium oxide having sulfate ions and aluminum ions adsorbed thereon obtained by making contact with aluminum sulfate at more than 1 wt % and not more than 6 wt % relative to titanium oxide in the presence of water, an oxo acid salt of vanadium or a vanadyl salt and an oxo acid or an oxo acid salt of molybdenum and/or tungsten are supported in a proportion of more than 0 atom % and not more than 3 atom %, respectively. By this, the degradation of catalyst performance can be suppressed even with exhaust gas containing potassium compounds at a high concentration in combustion ash.
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