A Transient Kinetic Study of the Co-Oxidation Over a Cu-Cr-Catalyst

Dekker, F.H.M.; Dekker, M. C.; Kapteijn, Freek; Moulijn, Jacob A.; Bliek, A.

doi:10.1007/978-94-011-1759-3_36

Cited by 3 publications

(30 citation statements)

References 13 publications

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“…The use of labeled 13 CO was unnecessary in series (I) over Cu, since it was found that CO 2 /N 2 O and CO/N 2 are not formed simultaneously under the applied conditions.…”

Section: Methodsmentioning

confidence: 97%

“…To be able to discriminate between the responses of CO 2 and N 2 O and the responses of CO and N 2 in the mass spectrometer, 13 CO was used in all experiments over Cu-Cr and in series (II) over Cu. The use of labeled 13 CO was unnecessary in series (I) over Cu, since it was found that CO 2 /N 2 O and CO/N 2 are not formed simultaneously under the applied conditions.…”

Section: Methodsmentioning

confidence: 99%

“…Finally, the corrected data were presented as molar fraction in the product gas mixture. The apparatus has previously been described in more detail (13,14,16).…”

Section: Apparatusmentioning

confidence: 99%

“…13 C, whereas the unlabeled species are addressed without a prefix, viz. C for 12 C. All gases were of HP or UHP grade (UCAR) and were purified (O 2 and/or H 2 O removal) before use.…”

Section: Gases and Catalystmentioning

confidence: 99%

“…As an exhaust gas catalyst typically operates under dynamic conditions, information on the behavior of the catalyst in a periodically changing feed gas composition is essential. Recently, the dynamic behavior over Cu-based catalysts was investigated by means of step-response experiments (13)(14)(15)(16). In the present study step-response analysis employing labeled and unlabeled compounds is used to obtain information on the NO reduction over Cu and Cu-Cr.…”

Section: Introductionmentioning

confidence: 99%

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NO Reduction over Alumina-Supported Cu and Cu–Cr Studied with the Step–Response Method

Dekker

Kraneveld

Bliek

et al. 1997

Journal of Catalysis

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“…The use of labeled 13 CO was unnecessary in series (I) over Cu, since it was found that CO 2 /N 2 O and CO/N 2 are not formed simultaneously under the applied conditions.…”

Section: Methodsmentioning

confidence: 97%

Section: Methodsmentioning

confidence: 99%

“…Finally, the corrected data were presented as molar fraction in the product gas mixture. The apparatus has previously been described in more detail (13,14,16).…”

Section: Apparatusmentioning

confidence: 99%

“…13 C, whereas the unlabeled species are addressed without a prefix, viz. C for 12 C. All gases were of HP or UHP grade (UCAR) and were purified (O 2 and/or H 2 O removal) before use.…”

Section: Gases and Catalystmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

NO Reduction over Alumina-Supported Cu and Cu–Cr Studied with the Step–Response Method

Dekker

Kraneveld

Bliek

et al. 1997

Journal of Catalysis

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Modelling the transient kinetics of heterogeneous catalysts. CO-oxidation over supported Cr and Cu

Dekker

Klopper

Bliek

et al. 1994

Chemical Engineering Science

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Modelling the transient kinetics of heterogeneous catalysts. CO oxidation over supported Cr and Cu Dekker, F.H.M.; Klopper, G.; Bliek, A.; Kapteijn, F.; Moulijn, J.A. Published in:Chemical Engineering Science Link to publicationCitation for published version (APA): Dekker, F. H. M., Klopper, G., Bliek, A., Kapteijn, F., & Moulijn, J. A. (1994). Modelling the transient kinetics of heterogeneous catalysts. CO oxidation over supported Cr and Cu. Chemical Engineering Science, 49(24), 4375-4390. General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. Abstract--This article illustrates the capabilities of the step response method in the determination of the mechanism and kinetics of a heterogeneously catalyzed reaction. The step response method was applied to investigate the CO oxidation over alumina-supported chromium and copper. Detailed mechanisms of this reaction were determined by measuring the isothermal reduction and oxidation of the catalysts via switching the gas-phase composition from inert (He) to either reducing (CO) or oxidizing (02) conditions, Modelling the obtained response curves has given information on the reaction rate constants of the elementary steps in the CO oxidation over the Cr and Cu catalyst. Here, only a minimum number of reaction steps and parameters have been used, but they are still physically acceptable. The reduction of the Cr catalyst was found to proceed via reaction of adsorbed CO. The activation energy of this process is 95 kJ mol -~. The dispersion of the Cr catalyst is 20%, whereas only half the metal atoms at the catalyst surface participate in the oxidation and reduction. The latter metal atoms are coordinated to about four removable oxygen atoms Reduction of the Cu catalyst takes place in three steps: first oxygen on the surface is removed via reaction of CO from the gas phase. Next the oxygen in the surface is removed via reaction of adsorbed CO, and finally the oxygen from the bulk of the catalyst that has diffused to the surface is removed. The activation energy of all three processes has been determined. The dispersion of the Cu catalyst was found to be about 22%, MODELLING THE TRANSIENT KINETICS OF H E T E R O G E N E O U S CATALYSTS. CO-OXIDATION OVER I N T R O D U C T I O NIn heterogeneous catalysis much effort is put into est...

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The Influence of the Rhodium Content in Platinum Catalysts and of the Gold Content in Nickel Catalysts on the Course of the CO + NO Reaction

Cwikła

Nazimek

1998

Adsorption Science & Technology

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With ever-increasing demands linked with decreasing sulphur levels in gasoline fuels, base metal catalysts have become attractive as alternatives. The Ni-Au system is an interesting alloy for use in the reaction between CO and NO, partly because of the large difference between the heats of chemisorption of NO and CO on the two metals. This paper presents a study of the course of NO reduction by CO which additionally made it possible to trace changes in the activity and selectivity of the process for alloys of varied Ni-Au composition and alloys of varied Pt-Rh composition together with the effects of Pt and Rh dispersion and the concentration of B5 sites on the surface of the Pt and Rh catalysts.

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A Transient Kinetic Study of the Co-Oxidation Over a Cu-Cr-Catalyst

Cited by 3 publications

References 13 publications

NO Reduction over Alumina-Supported Cu and Cu–Cr Studied with the Step–Response Method

NO Reduction over Alumina-Supported Cu and Cu–Cr Studied with the Step–Response Method

Modelling the transient kinetics of heterogeneous catalysts. CO-oxidation over supported Cr and Cu

The Influence of the Rhodium Content in Platinum Catalysts and of the Gold Content in Nickel Catalysts on the Course of the CO + NO Reaction

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