The role of reaction kinetics and mass transfer in the selective catalytic reduction of NO with NH3 in monolithic reactors
2015
Muñoz, Emilio | Marin, Pablo | Ordóñez, Salvador | Díez, Fernando V.
BACKGROUND: Environmental regulations are moving to tighter control of NOx emissions produced at both stationary and mobile sources. Selective catalytic reduction (SCR) of NOx with NH₃ is an efficient treatment technique capable of operating at high gas flow rates (e.g. using monolithic catalysts) and a wide range of NO concentrations. The aim of this work is to provide guidelines for designing this kind of reactor taking into account both intrinsic kinetics and mass transfer. RESULTS: Experiments have been done in lab‐scale (0.5 g) and bench‐scale (430 g) reactors operating under different conditions: temperature (150–320 °C), space velocity (WHSV 5360–16100 mol h⁻¹ kgcₐₜ ⁻¹), oxygen concentration (0–21%) and NH₃/NO ratio (0.2–1.2). Temperature has a great influence on the reaction rate, and at least 300 °C is required at a WHSV of 16100 mol h⁻¹ kgcₐₜ ⁻¹. Oxygen is required in the feed because it participates as reactant in SCR. CONCLUSIONS: Data obtained from the lab‐scale reactor in the absence of mass transfer limitations have been used to fit an intrinsic kinetic model of the SCR reaction. A more complex model has been used for the bench‐scale reactor accounting for reaction kinetics and mass transfer (internal effectiveness factor was determined) in the monolithic catalyst. © 2014 Society of Chemical Industry
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