Additions and Corrections - Oxidation of SO2 to SO3 over Honeycomb DeNoxing Catalysts

Autor:	Natale Ferlazzo, F. Bregani, Jiri Svachula, L. J. Alemany, Enrico Tronconi, Pio Forzatti
Rok vydání:	1994
Předmět:	General Chemical Engineering Inorganic chemistry chemistry.chemical_element General Chemistry Activation energy Oxygen Redox Industrial and Manufacturing Engineering Catalysis Reaction rate Ammonia chemistry.chemical_compound chemistry Honeycomb Sulfate
Zdroj:	Industrial & Engineering Chemistry Research. 33:1644-1644
ISSN:	1520-5045 0888-5885
DOI:	10.1021/ie00030a600
Popis:	A systematic study addressing the effects of the operating conditions (contact time, temperature), of feed composition (O 2 , SO 2 , H 2 O, NH 3 , NO x , NH 3 +NO x concentrations), and of catalyst design parameters (wall thickness, V content) in the oxidation of SO 2 to SO 3 over honeycomb commercial type DeNoxing catalysts is described. Data are presented which refer to transient behavior of the catalysts, indicating that long conditioning times are required associated with the buildup of surface sulfate species. The steady-state reaction rate is of variable order in SO 2 , the order increasing with SO 2 concentration as long as this is below 200 ppm and then decreasing; it is asymptotically independent of oxygen, depressed by water, strongly inhibited by ammonia, and slightly enhanced by NO x . The apparent activation energy changes from ≃50 to ≃20 kcal/mol on increasing the reaction temperature. A redox steady-state kinetic model is presented which accomodates qualitatively all of the observed effects. Once properly modified the same model has the potential to explain also transient effects during conditioning of the catalyst
Databáze:	OpenAIRE
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