Silicotungstic acid modified Ce‐Fe‐Ox catalyst for selective catalytic reduction of NOx with NH3: Effect of the amount of HSiW
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Abstract
The HSiW( x )/Ce‐Fe catalysts were used to research the effect of silicotungstic acid contents on the catalytic activity in the selective catalytic reduction of NO x with NH 3 . Doping different contents of silicotungstic acid affected surface species and redox property as well as the catalytic activity. With the increasing amount of HSiW ( x = 5%, 10% and 20%), the redox reaction between Fe 3+ /Fe 2+ and Ce 4+ /Ce 3+ enhanced, which could improve the ratio of Ce 3+ and Fe 3+ . And then, more Ce 3+ increased the ratio of chemisorbed oxygen (O α ). Besides, the type and strength of acid sites over HSiW( x )/Ce‐Fe was affected by the HSiW contents. These factors facilitated the catalytic performance. Thus, the NO x conversion of HSiW( x )/Ce‐Fe( x = 20%) was higher than 90%, which maintained in a wide temperature range between 200 and 400 °C.
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