Capture of volatilized vanadium and tungsten compounds in a selective catalytic reduction system
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United States of America Patent
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Jul 9, 2013
Grant Date -
Mar 8, 2012
app pub date -
Sep 30, 2011
filing date -
Dec 15, 2009
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Abstract
An apparatus and method for treating diesel exhaust gases are described. The system consists of two functionalities, the first being a selective catalytic reduction (SCR) catalyst system and the second being a capture material for capturing catalyst components such as vanadia that have appreciable volatility under extreme exposure conditions. The SCR catalyst component is typically based on a majority phase of titania, with added minority-phase catalyst components comprising of one or more of the oxides of vanadium, silicon, tungsten, molybdenum, iron, cerium, phosphorous, copper and/or manganese vanadia. The capture material typically comprises a majority phase of high surface area oxides such as silica-stabilized titania, alumina, or stabilized alumina, for example.
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