Quantification of hydrocarbon species on surfaces by combined microbalance-FTIR

Andrew I. McNab; Tom Heinze; Alan J. McCue; Davide Dionisi; James A. Anderson

doi:10.1016/j.saa.2017.03.030

Quantification of hydrocarbon species on surfaces by combined microbalance-FTIR

Andrew I. McNab, Tom Heinze, Alan J. McCue, Davide Dionisi, James A. Anderson

University of Aberdeen

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

6 Citations (Scopus)

11 Downloads (Pure)

Abstract

Absorption coefficients for the asymmetric stretching modes of CH3 and CH2 groups formed by adsorbing alkyl chained species from the vapour phase onto two different adsorbents; a γ-alumina support material and a supported metal catalyst have been determined using a custom made thermogravimetric-infrared cell. Results show that despite variations in the individually calculated absorption coefficients (ca. ± 20%), the ratio of the absorption coefficients (CH2:CH3) remained consistent despite employing adsorbates of varying chain length and functionality, and despite the choice of adsorbents which exhibited different surface areas and light scattering characteristics. The use of this absorption coefficient ratio has been shown to be applicable in the quantification of the average chain length of multiple adsorbed species of differing chain length. The potential for applying this to scenarios where reactions on surfaces are monitored is discussed.

Original language	English
Pages (from-to)	65-72
Number of pages	8
Journal	Spectrochimica Acta Part A
Volume	181
Early online date	16 Mar 2017
DOIs	https://doi.org/10.1016/j.saa.2017.03.030
Publication status	Published - 15 Jun 2017

Bibliographical note

We thank the Royal Society London for funding the initial prototype of the FTIR/Balance cell through the Paul Instrument Fund, the EU through the ERASMUS scheme (To T. H), and to research students (E. Mitchell) and PDRAs (D. Rosenberg) who were involved in contributions to the design and implementation of the cell.

Keywords

Quantification
FTIR
Adsorbed hydrocarbons
Fischer-Tropsch catalyst
Absorption coefficient

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10.1016/j.saa.2017.03.030Licence: Unspecified

Accepted Manuscript
© 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Accepted author manuscript, 977 KBLicence: CC BY-NC-ND

http://www.sciencedirect.com/science/article/pii/S1386142517302068

Cite this

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title = "Quantification of hydrocarbon species on surfaces by combined microbalance-FTIR",

abstract = "Absorption coefficients for the asymmetric stretching modes of CH3 and CH2 groups formed by adsorbing alkyl chained species from the vapour phase onto two different adsorbents; a γ-alumina support material and a supported metal catalyst have been determined using a custom made thermogravimetric-infrared cell. Results show that despite variations in the individually calculated absorption coefficients (ca. ± 20%), the ratio of the absorption coefficients (CH2:CH3) remained consistent despite employing adsorbates of varying chain length and functionality, and despite the choice of adsorbents which exhibited different surface areas and light scattering characteristics. The use of this absorption coefficient ratio has been shown to be applicable in the quantification of the average chain length of multiple adsorbed species of differing chain length. The potential for applying this to scenarios where reactions on surfaces are monitored is discussed.",

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author = "McNab, {Andrew I.} and Tom Heinze and McCue, {Alan J.} and Davide Dionisi and Anderson, {James A.}",

note = "We thank the Royal Society London for funding the initial prototype of the FTIR/Balance cell through the Paul Instrument Fund, the EU through the ERASMUS scheme (To T. H), and to research students (E. Mitchell) and PDRAs (D. Rosenberg) who were involved in contributions to the design and implementation of the cell.",

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AU - McNab, Andrew I.

AU - Heinze, Tom

AU - McCue, Alan J.

AU - Dionisi, Davide

AU - Anderson, James A.

N1 - We thank the Royal Society London for funding the initial prototype of the FTIR/Balance cell through the Paul Instrument Fund, the EU through the ERASMUS scheme (To T. H), and to research students (E. Mitchell) and PDRAs (D. Rosenberg) who were involved in contributions to the design and implementation of the cell.

PY - 2017/6/15

Y1 - 2017/6/15

N2 - Absorption coefficients for the asymmetric stretching modes of CH3 and CH2 groups formed by adsorbing alkyl chained species from the vapour phase onto two different adsorbents; a γ-alumina support material and a supported metal catalyst have been determined using a custom made thermogravimetric-infrared cell. Results show that despite variations in the individually calculated absorption coefficients (ca. ± 20%), the ratio of the absorption coefficients (CH2:CH3) remained consistent despite employing adsorbates of varying chain length and functionality, and despite the choice of adsorbents which exhibited different surface areas and light scattering characteristics. The use of this absorption coefficient ratio has been shown to be applicable in the quantification of the average chain length of multiple adsorbed species of differing chain length. The potential for applying this to scenarios where reactions on surfaces are monitored is discussed.

AB - Absorption coefficients for the asymmetric stretching modes of CH3 and CH2 groups formed by adsorbing alkyl chained species from the vapour phase onto two different adsorbents; a γ-alumina support material and a supported metal catalyst have been determined using a custom made thermogravimetric-infrared cell. Results show that despite variations in the individually calculated absorption coefficients (ca. ± 20%), the ratio of the absorption coefficients (CH2:CH3) remained consistent despite employing adsorbates of varying chain length and functionality, and despite the choice of adsorbents which exhibited different surface areas and light scattering characteristics. The use of this absorption coefficient ratio has been shown to be applicable in the quantification of the average chain length of multiple adsorbed species of differing chain length. The potential for applying this to scenarios where reactions on surfaces are monitored is discussed.

KW - Quantification

KW - FTIR

KW - Adsorbed hydrocarbons

KW - Fischer-Tropsch catalyst

KW - Absorption coefficient

U2 - 10.1016/j.saa.2017.03.030

DO - 10.1016/j.saa.2017.03.030

M3 - Article

SN - 1386-1425

VL - 181

SP - 65

EP - 72

JO - Spectrochimica Acta Part A

JF - Spectrochimica Acta Part A

ER -

Quantification of hydrocarbon species on surfaces by combined microbalance-FTIR

Abstract

Bibliographical note

Keywords

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Cite this