Kinetics of the selective catalytic reduction of NO with NH[sub 3] over Mn[sub 2]O[sub 3]-WO[sub 3]/[gamma]-Al[sub 2]O[sub 3]

Journal Article · Mon Mar 01 00:00:00 EST 1993 · Industrial and Engineering Chemistry Research; (United States)

DOI:https://doi.org/10.1021/ie00015a007· OSTI ID:6532862

Kapteijn, F; Singoredjo, L; Dekker, N J.J.; Moulijn, J A ^[1]

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1. Univ. of Amsterdam (Netherlands)

A kinetic study of the selective catalytic reduction (SCR) of NO with NH[sub 3] over an alumina-supported Mn[sub 2]O[sub 3]-WO[sub 3] (10.8 wt % Mn[sub 2]O[sub 3], 6.8 wt % WO[sub 3]) catalyst has been conducted between 383 and 423 K at atmospheric pressure over a broad range of concentration conditions (100-2,000 ppm NO and NH[sub 3], 0.5-10% O[sub 2]) and space times (W/F[sub NO] = 220-17,647 kg[center dot]s/mol). A kinetic model is proposed on the basis of mechanistic insights in the SCR process and data on manganese oxide catalysts, using two different types of sites: one for NH[sub 3] adsorption and the other for NO and O[sub 2] adsorption. The selected rate expression, derived from this model, can describe the entire data set within 3% conversion accuracy. A Freundlich type of NO adsorption had to be assumed. At the intermediate temperatures the rate expression reduces to a power rate expression which describes the results equally well. The apparent reaction order is over the range of conditions approximately 0.4 to NO and O[sub 2] and around 0 for NH[sub 3]. The overall activation energy amounts to 20-30 kJ/mol.

• OSTI ID: 6532862
• Journal Information: Industrial and Engineering Chemistry Research; (United States), Vol. 32:3; ISSN 0888-5885
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
01 COAL, LIGNITE, AND PEAT
MANGANESE OXIDES
CATALYTIC EFFECTS
NITRIC OXIDE
SELECTIVE CATALYTIC REDUCTION
TUNGSTEN OXIDES
ACTIVATION ENERGY
ADSORPTION
AIR POLLUTION CONTROL
ALUMINIUM OXIDES
AMMONIA
CATALYST SUPPORTS
CHEMICAL REACTION KINETICS
KINETIC EQUATIONS
MATHEMATICAL MODELS
ALUMINIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
CONTROL
DENITRIFICATION
ENERGY
EQUATIONS
HYDRIDES
HYDROGEN COMPOUNDS
KINETICS
MANGANESE COMPOUNDS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
REACTION KINETICS
REDUCTION
REFRACTORY METAL COMPOUNDS
SORPTION
TRANSITION ELEMENT COMPOUNDS
TUNGSTEN COMPOUNDS
540120* - Environment
Atmospheric- Chemicals Monitoring & Transport- (1990-)
010800 - Coal
Lignite
& Peat- Waste Management