Manganese-based catalyst for NO removal at low temperatures: thermodynamics analysis and experimental validation

Abstract

Selective catalytic reduction of nitrogen oxides with loaded urea is a novel method for removing NO under excess oxygen and low temperature conditions. In present work, a comprehensive thermodynamic study for NO removal is executed based on the Gibbs free energy change. This research mainly includes the detailed analyses of NO removal mechanism, the feasibility analyses for manganese as the active element and the experimental study for synthesized manganese-based catalyst (preparation, characterization and performance test). The catalyst in present study can reach 82% NO conversion and near 98% N₂ selectivity at 50 °C, which validates the correctness of the thermodynamic calculations.

KEYWORDS:

• catalyst
• low temperature
• nitrogen oxides
• selective catalytic reduction
• thermodynamic analysis

Additional information

Funding

The authors wish to acknowledge financial support from the Major State Research Development Program of China [2017YFB0603603], the National Natural Science Foundation of China [51576035, 51304048] and the Fundamental Research Funds for the Central Universities [N162504012].