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Updated: May 21, 2026

Ammonia Synthesis at Low Pressure
Published on: August 23, 2017
Suppression of Ammonia Slip by Smart Reductants in Selective Catalytic Reduction of Nitrogen Oxides
Xiaoya Xue1, Aling Chen1, Jun Liu1
1Innovation Institute of Carbon Neutrality, International Joint Laboratory of Catalytic Chemistry, College of Sciences, State Key Laboratory of Materials for Advanced Nuclear Energy, Shanghai University, Shanghai, China.
Abstract:
Ammonia (NH3)-based selective catalytic reduction (SCR) is a mainstream flue gas denitration technology for stationary and mobile sources, but NH3 slip remains a critical challenge from mismatches between stoichiometric reaction requirements and fluctuating nitrogen oxides (NOx) concentrations. Herein, we show organic amines (e.g., n-butylamine, n-B) act as smart reductants for SCR systems. Unlike NH3, n-B reacts stoichiometrically with NOx and undergoes NO-accelerated self-elimination when overdosed over TiO2-supported VOx catalysts. Mechanistic studies reveal Ti─OH sites on the catalyst facilitate n-B adsorption and activation, with the *NH3 intermediate driving NOx reduction. *NH2 from excess n-B oxidizes to nitrites and NO2 under NO+O2, which further react with *NH3 via an internal SCR pathway, avoiding free NH3 formation and slip. We propose a hybrid reductants system (NH3 + n-B) enabling efficient NH3 slip suppression over a reductant/NOx molar ratio of 1.2, providing a promising strategy without modifying existing SCR hardware or structures.
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