Optical emission and raman spectroscopy studies of reactivity of low-pressure glow discharges in Ar-O 2 and He-O 2 gas mixtures with coked catalysts

Abdulaziz M. Al-Jalal; Mohammad Aslam Khan

doi:10.1007/s11090-009-9201-3

Optical emission and raman spectroscopy studies of reactivity of low-pressure glow discharges in Ar-O ₂ and He-O ₂ gas mixtures with coked catalysts

Abdulaziz M. Al-Jalal, Mohammad Aslam Khan

Department of Physics

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

11 Scopus citations

Abstract

We demonstrate that low-pressure glow discharges in He-O ₂ gas mixture are effective in removing carbonaceous surface layers from coked catalysts. These discharges contain a number of reactive species including O, O ₃, and O ₂, and all these could contribute in the decoking process. However, an evolving understanding is that the O atoms in the discharge have a predominant role in this. A working hypothesis is that the O atoms react with the coke to form CO, CO ₂ and other carbon complexes. Online measurements using emission spectra from O, H, and CO in the discharges are compared for the cases of He-O ₂ and Ar-O ₂ gas mixtures. Under the reported experimental conditions the estimated reactivity of the He-O ₂ discharges is considerably higher compared with discharges in the Ar-O ₂ gas mixture. Raman spectroscopy is used to confirm the removal of the coke from the surface of Pt/Alumina catalyst.

Original language	English
Pages (from-to)	173-182
Number of pages	10
Journal	Plasma Chemistry and Plasma Processing
Volume	30
Issue number	1
DOIs	https://doi.org/10.1007/s11090-009-9201-3
State	Published - Feb 2010

Bibliographical note

Funding Information:
Acknowledgments This work is a part of Research Project Phys-2247 supported by Saudi Aramco. The support provided by King Fahd University of Petroleum and Minerals is also gratefully acknowledged. We would like to thank Mr. M. Dastageer and Mr Pillai for their help.

Keywords

Ar-O and He-O glow discharges
CO and H spectra
Catalyst decoking

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering
Condensed Matter Physics
Surfaces, Coatings and Films

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This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1007/s11090-009-9201-3

Cite this

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title = "Optical emission and raman spectroscopy studies of reactivity of low-pressure glow discharges in Ar-O 2 and He-O 2 gas mixtures with coked catalysts",

abstract = "We demonstrate that low-pressure glow discharges in He-O 2 gas mixture are effective in removing carbonaceous surface layers from coked catalysts. These discharges contain a number of reactive species including O, O 3, and O 2, and all these could contribute in the decoking process. However, an evolving understanding is that the O atoms in the discharge have a predominant role in this. A working hypothesis is that the O atoms react with the coke to form CO, CO 2 and other carbon complexes. Online measurements using emission spectra from O, H, and CO in the discharges are compared for the cases of He-O 2 and Ar-O 2 gas mixtures. Under the reported experimental conditions the estimated reactivity of the He-O 2 discharges is considerably higher compared with discharges in the Ar-O 2 gas mixture. Raman spectroscopy is used to confirm the removal of the coke from the surface of Pt/Alumina catalyst.",

keywords = "Ar-O and He-O glow discharges, CO and H spectra, Catalyst decoking",

author = "Al-Jalal, \{Abdulaziz M.\} and Khan, \{Mohammad Aslam\}",

note = "Funding Information: Acknowledgments This work is a part of Research Project Phys-2247 supported by Saudi Aramco. The support provided by King Fahd University of Petroleum and Minerals is also gratefully acknowledged. We would like to thank Mr. M. Dastageer and Mr Pillai for their help.",

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doi = "10.1007/s11090-009-9201-3",

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T1 - Optical emission and raman spectroscopy studies of reactivity of low-pressure glow discharges in Ar-O 2 and He-O 2 gas mixtures with coked catalysts

AU - Al-Jalal, Abdulaziz M.

AU - Khan, Mohammad Aslam

N1 - Funding Information: Acknowledgments This work is a part of Research Project Phys-2247 supported by Saudi Aramco. The support provided by King Fahd University of Petroleum and Minerals is also gratefully acknowledged. We would like to thank Mr. M. Dastageer and Mr Pillai for their help.

PY - 2010/2

Y1 - 2010/2

N2 - We demonstrate that low-pressure glow discharges in He-O 2 gas mixture are effective in removing carbonaceous surface layers from coked catalysts. These discharges contain a number of reactive species including O, O 3, and O 2, and all these could contribute in the decoking process. However, an evolving understanding is that the O atoms in the discharge have a predominant role in this. A working hypothesis is that the O atoms react with the coke to form CO, CO 2 and other carbon complexes. Online measurements using emission spectra from O, H, and CO in the discharges are compared for the cases of He-O 2 and Ar-O 2 gas mixtures. Under the reported experimental conditions the estimated reactivity of the He-O 2 discharges is considerably higher compared with discharges in the Ar-O 2 gas mixture. Raman spectroscopy is used to confirm the removal of the coke from the surface of Pt/Alumina catalyst.

AB - We demonstrate that low-pressure glow discharges in He-O 2 gas mixture are effective in removing carbonaceous surface layers from coked catalysts. These discharges contain a number of reactive species including O, O 3, and O 2, and all these could contribute in the decoking process. However, an evolving understanding is that the O atoms in the discharge have a predominant role in this. A working hypothesis is that the O atoms react with the coke to form CO, CO 2 and other carbon complexes. Online measurements using emission spectra from O, H, and CO in the discharges are compared for the cases of He-O 2 and Ar-O 2 gas mixtures. Under the reported experimental conditions the estimated reactivity of the He-O 2 discharges is considerably higher compared with discharges in the Ar-O 2 gas mixture. Raman spectroscopy is used to confirm the removal of the coke from the surface of Pt/Alumina catalyst.

KW - Ar-O and He-O glow discharges

KW - CO and H spectra

KW - Catalyst decoking

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