High-performance aerogel DeNO{sub x} catalyst: Catalytic behavior and kinetic modeling
- Swiss Federal Inst. of Tech., Zurich (Switzerland). Dept. of Chemical Engineering and Industrial Chemistry
The kinetics and the parametric sensitivity of the selective catalytic reduction of NO by NH{sub 3} were investigated for a high surface area vanadia-titania aerogel. The catalyst showed high activity at low temperatures and the selectivity to N{sub 2} was higher than 99% for all experimental conditions investigated. The addition of up to 2% H{sub 2}O to the dry feed notably reduced the rate of NO conversion. The effect leveled off for higher H{sub 2}O concentrations. In the absence of O{sub 2} in the feed the activity collapsed, independently whether water was present or not. Small amounts of oxygen resulted in a sharp increase of the reaction rate, but for oxygen concentrations exceeding 4%, the increase diminished. A high tolerance with respect to sulfur dioxide was observed. The estimated activation energy amounted to 60 {+-} 1 kJ/mol. The microkinetic analysis resulted in a model based on an Eley-Rideal mechanism which describes the kinetic behavior over a wide experimental range.
- OSTI ID:
- 536410
- Journal Information:
- Industrial and Engineering Chemistry Research, Vol. 36, Issue 8; Other Information: PBD: Aug 1997
- Country of Publication:
- United States
- Language:
- English
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