Transient kinetics of SO{sub 2} oxidation over SCR-DeNO{sub x} monolith catalysts

Journal Article · Thu Jul 01 04:00:00 EDT 1999 · Industrial and Engineering Chemistry Research

DOI:https://doi.org/10.1021/ie980673e· OSTI ID:680074

Tronconi, E; Cavanna, A; Orsenigo, C; Forzatti, P ^[1]

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1. Politecnico di Milano (Italy). Dipt. di Chimica Industriale e Ingegneria Chimica

A dramatic kinetic study of the undesired oxidation of SO{sub 2} over a commercial V{sub 2}O{sub 5}-WO{sub 3}/TiO{sub 2} monolith catalyst for the SCR-DeNO{sub x} process is herein presented. Transient SO{sub 2} conversion data were systematically collected during experiments involving step changes of temperature, area velocity, and feed composition (SO{sub 2}, O{sub 2}, H{sub 2}O, and NH{sub 3}). Characteristic times of the system response were of a few hours: peculiar SO{sub 3} emission peaks were apparent upon increasing the reaction temperature and the H{sub 2}O feed content. The data were well interpreted by a dynamic kinetic model assuming that buildup-depletion of surface sulfate species is rate controlling. The model accounts successfully also for the transient effects resulting from the interaction between the SCR-DeNO{sub x} reaction (NO{sub x} reduction with NH{sub 3}) and the oxidation of SO{sub 2}.

• OSTI ID: 680074
• Journal Information: Industrial and Engineering Chemistry Research, Journal Name: Industrial and Engineering Chemistry Research Journal Issue: 7 Vol. 38; ISSN IECRED; ISSN 0888-5885
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
20 FOSSIL-FUELED POWER PLANTS
CATALYSTS
CHEMICAL REACTION KINETICS
COMBINED SOXNOX PROCESSES
FLUE GAS
FOSSIL-FUEL POWER PLANTS
OXIDATION
SELECTIVE CATALYTIC REDUCTION
SULFUR DIOXIDE