ChemInform Abstract: OXYGEN INHIBITION IN THE DECOMPOSITION OF NO ON METAL OXIDES AND PLATINUM

Amirnazmi, Ali; BENSON, J. E.; Boudart, M.

doi:10.1002/chin.197341054

Cited by 25 publications

(41 citation statements)

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“…The series is similar to those generally observed for catalytic oxidation reactions (20,21), with the exception of the position of iron(II1) oxide. It resembles those found for the nitric oxide/carbon dioxide reaction (22), the nitrous oxide/carbon dioxide reaction (23), and the decomposition of nitric (24) and nitrous (25) oxides.…”

Section: Discussionsupporting

confidence: 75%

Oxidation of 1-butene by nitrous oxide over manganese(III) and related transition metal oxides

Ross¹,

Fairbridge²

1984

Can. J. Chem.

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The oxidation of 1-butene by nitrous oxide over manganese(II1) oxide was studied in a continuous flow system from 573 to 673 K. Kinetic parameters were derived from the exponential relationship: r = ka P::~P:~;, over reactant partial pressure ranges, 0.30 < PN20 < 2.60 kPa and 0.43 < PC,,, < 8.27 kPa. The reaction mechanism proposed involves a complex sequence of steps which include surface radical reactions. On the basis of a comparison of specific reaction rates, the catalytic activity series for the reaction over a number of transition metal oxides was: Introduction The catalytic performance of manganese oxides in several redox reactions involving hydrocarbons with oxygen or nitrogen oxides has been reported recently. The work has included the oxidation of ethane by nitric oxide over unsupported manganese(II1) oxide (1) and the oxidation of 1-butene and ethane by oxygen over manganese(II1) oxide supported on carbon fibres (2). The results of these experiments pointed to complex surface mechanisms with rate-controlling steps most probably associated with the interactions of species within the adsorbed layer.In the present investigation an attempt has been made to evaluate the kinetics of the catalysis of 1-butene by nitrous oxide over manganese(II1) oxide. Measurements of reaction rates were supplemented by structural analysis. A general comparison of the catalytic activities in the reaction of metal oxides of the first transition series has also been carried out.

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Section: Discussionsupporting

confidence: 75%

Oxidation of 1-butene by nitrous oxide over manganese(III) and related transition metal oxides

Ross¹,

Fairbridge²

1984

Can. J. Chem.

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“…The involvement of fast mobile oxygen species on O*-covered surfaces, detected here from isotopic exchange rates and selectivities, has been previously proposed to account for the effects of O 2 pressure on the rates of NO decomposition. 21 We conclude that O 2 activation on O*-covered surfaces is limited by the reaction of O 2 with a vacancy to form O* and mobile oxygen adatoms that rapidly migrate among strongly bound O* species. These data and conclusions suggest that the cleavage of O)O bonds occurs rapidly even without the assistance of coadsorbed reactants (e.g., NO* or CO*, as proposed elsewhere 15,22 Figure 3.…”

Section: Experimental Methods 21 Catalyst Synthesis and Characterizmentioning

confidence: 79%

NO Oxidation Catalysis on Pt Clusters: Elementary Steps, Structural Requirements, and Synergistic Effects of NO₂Adsorption Sites

2009

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Kinetic and isotopic methods show that NO oxidation on supported Pt clusters involves kinetically relevant reaction of O 2 with vacancy sites on surfaces nearly saturated with oxygen adatoms (O*). The oxygen chemical potential at Pt surfaces that determines the O* coverage is rigorously described by an O 2 virtual pressure and determined by the thermodynamics of NO 2 -NO interconversion reactions. NO oxidation and oxygen isotopic exchange processes are described by the same rate constant, consistent with similar kinetically relevant O 2 dissociation steps for both reactions. NO oxidation, NO 2 decomposition, andO 2 exchange rates increased markedly with increasing Pt cluster size (1-8 nm); these clusters remain metallic at all O 2 virtual pressures prevalent during NO oxidation. These effects of cluster size reflect the higher vacancy concentrations and more facile oxygen desorption on larger Pt clusters, which bind oxygen adatoms weaker than more coordinatively unsaturated surface Pt atoms on smaller clusters. These trends are similar to those found for methane and dimethyl ether combustion on Pt and Pd catalysts, which also require vacancy sites on O*-saturated cluster surfaces in their respective kinetically relevant steps. Inhibition of NO oxidation by NO 2 persists to undetectable NO 2 concentrations; thus, NO oxidation turnover rates increase significantly when NO 2 adsorption sites present on BaCO 3 /Al 2 O 3 are placed within diffusion distances of Pt clusters. NO oxidation rates on intrapellet catalyst-adsorbent mixtures are described accurately by a simple reaction-adsorption model in which NO 2 adsorbs via displacement of CO 2 on BaCO 3 surfaces.

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“…The reaction occurred above 400 • C, and the conversion was below 10% in the whole temperature range. The low activity of NO direct decomposition is probably due to a strong affinity of oxygen towards silver surfaces [26,27].…”

Section: Effect Of Feed Gas Compositionsmentioning

confidence: 99%

On the selectively catalytic reduction of NOx with methane over Ag-ZSM-5 catalysts

Shi

Cheng

et al. 2002

Applied Catalysis B: Environmental

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ChemInform Abstract: OXYGEN INHIBITION IN THE DECOMPOSITION OF NO ON METAL OXIDES AND PLATINUM

Abstract: Die Zersetzung von NO wird an den Oxiden von Fe, Co, Ni, Cu und Zr sowie an auf Trägermaterialien aufgebrachtem Pt bei 780 bis 960 Torr und zwischen 450 und 1000°C untersucht.

Cited by 25 publications

References 1 publication

Oxidation of 1-butene by nitrous oxide over manganese(III) and related transition metal oxides

Oxidation of 1-butene by nitrous oxide over manganese(III) and related transition metal oxides

NO Oxidation Catalysis on Pt Clusters: Elementary Steps, Structural Requirements, and Synergistic Effects of NO₂Adsorption Sites

On the selectively catalytic reduction of NOx with methane over Ag-ZSM-5 catalysts

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ChemInform Abstract: OXYGEN INHIBITION IN THE DECOMPOSITION OF NO ON METAL OXIDES AND PLATINUM

Abstract: Die Zersetzung von NO wird an den Oxiden von Fe, Co, Ni, Cu und Zr sowie an auf Trägermaterialien aufgebrachtem Pt bei 780 bis 960 Torr und zwischen 450 und 1000°C untersucht.

Cited by 25 publications

References 1 publication

Oxidation of 1-butene by nitrous oxide over manganese(III) and related transition metal oxides

Oxidation of 1-butene by nitrous oxide over manganese(III) and related transition metal oxides

NO Oxidation Catalysis on Pt Clusters: Elementary Steps, Structural Requirements, and Synergistic Effects of NO2Adsorption Sites

On the selectively catalytic reduction of NOx with methane over Ag-ZSM-5 catalysts

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NO Oxidation Catalysis on Pt Clusters: Elementary Steps, Structural Requirements, and Synergistic Effects of NO₂Adsorption Sites