A statistical model for flash thermal desorption of carbon dioxide from polycrystalline molybdenum

L. D. López-Carreño; A. J. Ramírez-Cuesta; L. Viscido; J. M. Heras

doi:10.1016/S1381-1169(00)00502-1

A statistical model for flash thermal desorption of carbon dioxide from polycrystalline molybdenum

L. D. López-Carreño, A. J. Ramírez-Cuesta, L. Viscido, J. M. Heras

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

The interaction of CO₂ with a polycrystalline molybdenum-foil (Mo-foil) was previously studied at 77K through mass-resolved flash thermal desorption spectroscopy (FTDS). From the results, a statistical model was developed with two kinds of sites (bridge and hollow type), CO₂ can adsorb on both but dissociates only on hollow ones. The proposed model reproduces the evolution of desorption peak areas as a function of CO₂ exposure without using any fitting parameter. Because of the sample polycrystallinity, all desorption peaks were fitted assuming a Gaussian distribution of desorption energies with a pre-exponential factor of 10¹³. Values of ∼60.6, ∼126.9 and ∼158.7 kJ/mol were obtained for the desorption energies of CO₂ from α₁, β₁ and γ₁ states, respectively, while 73.1 and 110.6 kJ/mol correspond to the CO α₂ and β₂ desorption peaks.

Original language	English
Pages (from-to)	157-163
Number of pages	7
Journal	Journal of Molecular Catalysis A: Chemical
Volume	167
Issue number	1-2
DOIs	https://doi.org/10.1016/S1381-1169(00)00502-1
State	Published - Feb 20 2001
Externally published	Yes

Funding

The authors acknowledge the financial support of the Argentine Research Council (CONICET) as well as the donation of equipment by the A. von Humboldt-, the Volkswagen Werk-Foundations (Germany) and the International Program for Physical Sciences (IPPS, Sweden). L.D. L-C is also grateful to COLCIENCIAS (Colombia) and the International Center for Theoretical Physics (Italy) for financial assistance.

Keywords

Carbon dioxide
Carbon monoxide
Modeling flash desorption
Molybdenum

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10.1016/S1381-1169(00)00502-1

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title = "A statistical model for flash thermal desorption of carbon dioxide from polycrystalline molybdenum",

abstract = "The interaction of CO2 with a polycrystalline molybdenum-foil (Mo-foil) was previously studied at 77K through mass-resolved flash thermal desorption spectroscopy (FTDS). From the results, a statistical model was developed with two kinds of sites (bridge and hollow type), CO2 can adsorb on both but dissociates only on hollow ones. The proposed model reproduces the evolution of desorption peak areas as a function of CO2 exposure without using any fitting parameter. Because of the sample polycrystallinity, all desorption peaks were fitted assuming a Gaussian distribution of desorption energies with a pre-exponential factor of 1013. Values of ∼60.6, ∼126.9 and ∼158.7 kJ/mol were obtained for the desorption energies of CO2 from α1, β1 and γ1 states, respectively, while 73.1 and 110.6 kJ/mol correspond to the CO α2 and β2 desorption peaks.",

keywords = "Carbon dioxide, Carbon monoxide, Modeling flash desorption, Molybdenum",

author = "L{\'o}pez-Carre{\~n}o, \{L. D.\} and Ram{\'i}rez-Cuesta, \{A. J.\} and L. Viscido and Heras, \{J. M.\}",

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T1 - A statistical model for flash thermal desorption of carbon dioxide from polycrystalline molybdenum

AU - López-Carreño, L. D.

AU - Ramírez-Cuesta, A. J.

AU - Viscido, L.

AU - Heras, J. M.

PY - 2001/2/20

Y1 - 2001/2/20

N2 - The interaction of CO2 with a polycrystalline molybdenum-foil (Mo-foil) was previously studied at 77K through mass-resolved flash thermal desorption spectroscopy (FTDS). From the results, a statistical model was developed with two kinds of sites (bridge and hollow type), CO2 can adsorb on both but dissociates only on hollow ones. The proposed model reproduces the evolution of desorption peak areas as a function of CO2 exposure without using any fitting parameter. Because of the sample polycrystallinity, all desorption peaks were fitted assuming a Gaussian distribution of desorption energies with a pre-exponential factor of 1013. Values of ∼60.6, ∼126.9 and ∼158.7 kJ/mol were obtained for the desorption energies of CO2 from α1, β1 and γ1 states, respectively, while 73.1 and 110.6 kJ/mol correspond to the CO α2 and β2 desorption peaks.

AB - The interaction of CO2 with a polycrystalline molybdenum-foil (Mo-foil) was previously studied at 77K through mass-resolved flash thermal desorption spectroscopy (FTDS). From the results, a statistical model was developed with two kinds of sites (bridge and hollow type), CO2 can adsorb on both but dissociates only on hollow ones. The proposed model reproduces the evolution of desorption peak areas as a function of CO2 exposure without using any fitting parameter. Because of the sample polycrystallinity, all desorption peaks were fitted assuming a Gaussian distribution of desorption energies with a pre-exponential factor of 1013. Values of ∼60.6, ∼126.9 and ∼158.7 kJ/mol were obtained for the desorption energies of CO2 from α1, β1 and γ1 states, respectively, while 73.1 and 110.6 kJ/mol correspond to the CO α2 and β2 desorption peaks.

KW - Carbon dioxide

KW - Carbon monoxide

KW - Modeling flash desorption

KW - Molybdenum

UR - https://www.scopus.com/pages/publications/0035916203

U2 - 10.1016/S1381-1169(00)00502-1

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M3 - Article

AN - SCOPUS:0035916203

SN - 1381-1169

VL - 167

SP - 157

EP - 163

JO - Journal of Molecular Catalysis A: Chemical

JF - Journal of Molecular Catalysis A: Chemical

IS - 1-2

ER -

A statistical model for flash thermal desorption of carbon dioxide from polycrystalline molybdenum

Abstract

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Keywords

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