Kinetics and deactivation in the reduction of NO with CO on supported Pt catalysts

Reaction kinetics and catalyst deactivation during the redn. of NO with CO on a 0.5%Pt-3.4%MoO3/a-Al2O3 catalyst were investigated. The reaction shows an ignition/quenching behavior. After ignition, the reaction kinetics (formation of N2 and N2O) obey the bimol. Langmuir-Hinshelwood equations, in accordance with a dissociative mechanism. A slow catalyst deactivation is obsd. under reductive conditions (pCO >> pNO). The proposed mechanism comprises the formation of electron-withdrawing isocyanates on the Pt surface which slow down the Pt-CO bond formation, which is typical for the quenched state. It is pointed out that the isocyanates delay the formation of the quenched state but that the low activity in the quenched state is due to adsorbed CO. [on SciFinder (R)]


Published in:
Chemie Ingenieur Technik, 71, 1/2, 135-139
Year:
1999
Keywords:
Note:
CAN 130:201378 67-3 Catalysis, Reaction Kinetics, and Inorganic Reaction Mechanisms Lonza A.-G.,Visp,Switz. Journal 0009-286X written in German. 124-38-9 (Carbon dioxide); 7727-37-9 (Nitrogen); 10024-97-2 (Dinitrogen oxide) Role: FMU (Formation, unclassified), FORM (Formation, nonpreparative) (formation of; in kinetics and deactivation in redn. of NO with CO on supported Pt-MoO3 catalyst); 1313-27-5 (Molybdenum oxide (MoO3); 7440-06-4 (Platinum) Role: CAT (Catalyst use), USES (Uses) (kinetics and deactivation in redn. of NO with CO on supported Pt-MoO3 catalyst); 630-08-0 (Carbon monoxide); 10102-43-9 (Nitrogen monoxide) Role: RCT (Reactant), RACT (Reactant or reagent) (kinetics and deactivation in redn. of NO with CO on supported Pt-MoO3 catalyst)
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 Record created 2006-04-18, last modified 2018-03-17


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