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SO2 Oxidation Across Marine V2O5-WO3-TiO2 SCR Catalysts: a Study at Elevated Pressure for Preturbine SCR Configuration

  • Steen R. Christensen
  • Brian B. Hansen
  • Keld Johansen
  • Kim H. Pedersen
  • Joakim R. Thøgersen
  • Anker Degn Jensen
Article
  • 47 Downloads

Abstract

The undesired oxidation of SO2 was studied experimentally at elevated pressures of up to 4.5 bar across two commercial vanadium-based (1.2 and 3 wt% V2O5) selective catalytic reduction (SCR) catalysts. This pressure range is of interest for preturbine SCR reactor configuration for NOx reduction on ships. The residence time in the catalyst was kept constant, independent on pressure, by adjusting the total flow rate. The conversion of SO2 was of the order 0.2–3% at temperatures of 300–400 °C and was independent of the pressure. Based on the measured conversion of SO2, the kinetics were fitted using an nth order rate expression. The reaction order of SO2 was found close to 1, and the reaction order of SO3 was found close to 0, also at increased pressures of up to 4.5 bar. The rate of SO2 oxidation was clearly promoted by the presence of 1000 ppm NOx at elevated pressure; however, at atmospheric pressure, the effect was within experimental uncertainty. The promoting effect is explained by a catalyzed redox reaction between SO2 and NO2, and since more NO2 is formed at elevated pressure, a higher degree of promotion by NOx is observed at elevated pressures.

Keywords

SO2 oxidation Pressurized SO2 oxidation Preturbo SCR configuration SCR of NOx on ships SO3 formation 

Abbreviations

ABS

Ammonium bisulfate

AS

Ammonium sulfate

EGR

Exhaust gas recirculation

HE

Heat exchanger

MFC

Mass flow controller

NECA

NOx emission control area

NOx

Nitrogen oxides

RMSE

Residual mean square error

RSS

Residual sum of squares

SCR

Selective catalytic reduction

SECA

SOx emission control area

SOx

Sulfur oxides

V-SCR catalyst

Vanadium-based SCR catalyst

Symbols

α

Reaction order of SO2 []

β

Reaction order of SO3 []

Ea

Activation Energy [kJ/mol]

Fa.0

Molar feed rate of component a [mol/s]

G°

Gibbs free energy at 25 °C

k(Tref)

SO2 rate constant at temperature Tref

pa

Partial pressure of component a [Pa]

Q

Total volumetric flow rate [m3/h]

SS

Specific surface area of catalyst

Tref

Reference temperature for SO2 rate expression [K]

W

Mass of catalyst [kg]

X

Conversion []

Xe

Equilibrium conversion []

ycalc

Calculated SO2 conversion.

yexp

Measured SO2 conversion

Notes

Funding information

This work is part of the Danish societal partnership, Blue INNOship, and partly funded by Innovation Fund Denmark (IFD) under File No. 155-2014-10 and the Danish Maritime Fund. SRC gratefully acknowledges the funding support and the help received from the team at Topsøe A/S while running the experiments at their facilities.

Compliance with Ethical Standards

The authors declare that they have no competing interests.

Supplementary material

40825_2018_92_MOESM1_ESM.docx (71 kb)
Online Resources 1 (DOCX 71 kb)

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Chemical and Biochemical EngineeringTechnical University of DenmarkKgs. LyngbyDenmark
  2. 2.Haldor Topsøe A/SKgs. LyngbyDenmark
  3. 3.Umicore Denmark ApSKgs. LyngbyDenmark

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