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*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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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.
Original languageEnglish
JournalEmission Control Science and Technology
Volume4
Pages (from-to)289–299
ISSN2199-3629
DOIs
Publication statusPublished - 2018

Keywords

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

Cite this

@article{a1ed1ccc73964d3aabb88a9e249821c7,
title = "SO2 Oxidation Across Marine V2O5-WO3-TiO2 SCR Catalysts: a Study at Elevated Pressure for Preturbine SCR Configuration",
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 = "Pressurized SO2 oxidation, Preturbo SCR configuration, SCR of NOx on ships, SO2 oxidation, SO3 formation",
author = "Christensen, {Steen R.} and Hansen, {Brian B.} and Keld Johansen and Pedersen, {Kim H.} and Th{\o}gersen, {Joakim R.} and Jensen, {Anker Degn}",
year = "2018",
doi = "10.1007/s40825-018-0092-8",
language = "English",
volume = "4",
pages = "289–299",
journal = "Emission Control Science and Technology",
issn = "2199-3629",
publisher = "Springer",

}

SO2 Oxidation Across Marine V2O5-WO3-TiO2 SCR Catalysts: a Study at Elevated Pressure for Preturbine SCR Configuration. / Christensen, Steen R.; Hansen, Brian B.; Johansen, Keld; Pedersen, Kim H.; Thøgersen, Joakim R.; Jensen, Anker Degn.

In: Emission Control Science and Technology, Vol. 4, 2018, p. 289–299.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - SO2 Oxidation Across Marine V2O5-WO3-TiO2 SCR Catalysts: a Study at Elevated Pressure for Preturbine SCR Configuration

AU - Christensen, Steen R.

AU - Hansen, Brian B.

AU - Johansen, Keld

AU - Pedersen, Kim H.

AU - Thøgersen, Joakim R.

AU - Jensen, Anker Degn

PY - 2018

Y1 - 2018

N2 - 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.

AB - 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.

KW - Pressurized SO2 oxidation

KW - Preturbo SCR configuration

KW - SCR of NOx on ships

KW - SO2 oxidation

KW - SO3 formation

U2 - 10.1007/s40825-018-0092-8

DO - 10.1007/s40825-018-0092-8

M3 - Journal article

VL - 4

SP - 289

EP - 299

JO - Emission Control Science and Technology

JF - Emission Control Science and Technology

SN - 2199-3629

ER -