What question did this study set out to answer?

To evaluate the primary and secondary side reactions occurring during standard, fast, and NO2-rich selective catalytic reduction of nitrogen oxides with ammonia under simulated diesel exhaust conditions.

July 3, 2002Industrial & Engineering Chemistry Research

Side Reactions in the Selective Catalytic Reduction of NOx with Various NO2 Fractions

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Authors

GMGiuseppe MadiaPaul Scherrer Institute MKManfred KoebelPaul Scherrer Institute MEMartin ElsenerPaul Scherrer Institute

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Implication

Experimental study reveals how nitrogen dioxide levels and water vapor drive side reactions across vanadium-based catalysts, highlighting trade-offs in exhaust emissions control.

Key Points

To evaluate the primary and secondary side reactions occurring during standard, fast, and NO2-rich selective catalytic reduction of nitrogen oxides with ammonia under simulated diesel exhaust conditions.
Tested standard SCR (pure NO), fast SCR (equimolar NO and NO2), and NO2 SCR (pure NO2) over TiO2-WO3-V2O5 catalysts.
Assessed reaction selectivity and catalytic activity using synthetic gas mixtures matching diesel exhaust across various temperatures and water vapor concentrations.
High temperatures promoted competitive ammonia oxidation and nitrous oxide formation, which were strongly inhibited by water vapor, thereby improving SCR selectivity at the expense of low-temperature activity.
NO2 fractions above 50% increased low-temperature nitrous oxide formation, and pure NO2 feeds induced nitrous oxide synthesis across two separate temperature regimes involving ammonium nitrate or nitroamine intermediates.

Cite This Study

Madia et al. (2002) studied this question.

synapsesocial.com/papers/6a700d0531a3df8243285672 https://doi.org/10.1021/ie020054c

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Implication

Experimental study reveals how nitrogen dioxide levels and water vapor drive side reactions across vanadium-based catalysts, highlighting trade-offs in exhaust emissions control.

Side Reactions in the Selective Catalytic Reduction of NOx with Various NO2 Fractions

Discussion

Member takes

Implication

Key Points

Cite This Study

Side Reactions in the Selective Catalytic Reduction of NOx with Various NO2 Fractions

Discussion

Member takes

Implication

Key Points

Cite This Study

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