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The photochemical reaction of hydrocarbons under extreme thermobaric conditions
KTH, School of Industrial Engineering and Management (ITM), Energy Technology. Gubkin Russian State University of Oil and Gas, Russian Federation.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology. Gubkin Russian State University of Oil and Gas, Russian Federation.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology. Gubkin Russian State University of Oil and Gas, Russian Federation.ORCID iD: 0000-0001-8199-5625
2017 (English)In: Joint AIRAPT-25th and EHPRG-53rd International Conference on High Pressure Science and Technology, 2015, Institute of Physics Publishing (IOPP), 2017, article id 042056Conference paper (Refereed)
Abstract [en]

The photochemical reaction of hydrocarbons was found to play an important role in the experiments with the synthetic petroleum conducted in Diamond Anvil Cell (DAC). Raman spectroscopy with a green laser (514.5 nm) was used for in situ sample analysis. This photochemical effect was investigated in the pressure range of 0.7-5 GPa, in the temperature interval from the ambient conditions to 450 degrees C. The power of laser used in these experiment series was from 0.05 W to 0.6 W. The chemical transformation was observed when the necessary threshold pressure (similar to 2.8 GPa) was reached. This transformation correlated with the luminescence appearance on the Raman spectra and a black opaque spot in the sample was observed in the place where the laser focus was forwarded. The exposure time and laser power (at least in the 0.1-0.5 W range) did not play a role in the 0.1-0.5 GPa range.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2017. article id 042056
Series
Journal of Physics Conference Series, ISSN 1742-6588 ; 950
Keywords [en]
High-Pressure, Phase-Transitions, High-Temperatures, Diamond Formation, Polymerization, Methane, Dissociation, Benzene
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-221054DOI: 10.1088/1742-6596/950/4/042056ISI: 000418562300083Scopus ID: 2-s2.0-85038570066OAI: oai:DiVA.org:kth-221054DiVA, id: diva2:1172955
Conference
Joint 25th AIRAPT / 53rd EHPRG International Conference on High Pressure Science and Technology, AUG 30-SEP 04, 2015, Madrid, Spain
Note

QC 20180111

Available from: 2018-01-11 Created: 2018-01-11 Last updated: 2018-05-31Bibliographically approved
In thesis
1. Influence of the deep petroleum transformation on the CO2 budget of the atmosphere
Open this publication in new window or tab >>Influence of the deep petroleum transformation on the CO2 budget of the atmosphere
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Petroleum is an important component of the Earth’s crust and a necessary agent in human life. Due to fossil fuels usage in human activities, the carbon dioxide budget of the atmosphere is growing on the 4-5 GtC/year. However, could CO2 be generated from the“natural burning” of petroleum, resulting from the involvement of petroleum in subduction? During subduction, petroleum deposits, accumulated in the subducting slab, submerge down to the mantle and occur in the area with the extreme thermobaric conditions. As aresult, hydrocarbons undergo high temperature and pressure andcan be transformed into the oxidized form of carbon (such as CO2 and carbonates).The purpose of the present study is to investigate the role ofpetroleum in the deep processes of the Earth and explore, whether there is any influence from these processes on the carbon dioxide budget of the atmosphere. In the current thesis, the results of the experimental work are presented, which model the behavior of the petroleum hydrocarbons in the thermobaric conditions and surrounding environment of the lower part of the Earth's crust and upper mantle in the depth range of 20-300 km (320-2,000 °C, 0.7-9.5 GPa). High pressure,high-temperature experiments were carried out, using diamond anvil cells and a Toroid-type large reactive volume unit. The stability and possible transformations of hydrocarbon systems at the presence of slab and mantle surrounding, and fate of carbon, submerged down into the Earth's interiors in the form of hydrocarbon during subduction, was investigated.The obtained experimental results demonstrate the chemical transformation of petroleum during subduction. It was discovered, that CO2 was not formed from hydrocarbons during subduction. Hydrocarbons could react with the surrounding mantle and slab and transform into more sustainable compounds at thermobaric and Redox conditions, corresponding with the Earth’s deep interior. However, this process does not have any significant influence on the carbon dioxide budget of the atmosphere.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2018. p. 83
Series
TRITA-ITM-AVL ; 2018:21
National Category
Geosciences, Multidisciplinary
Identifiers
urn:nbn:se:kth:diva-229078 (URN)978-91-7729-811-3 (ISBN)
Public defence
2018-06-14, M311 (Brinellsalen), Brinellvägen 68, Stockholm, 13:00 (English)
Opponent
Supervisors
Available from: 2018-06-04 Created: 2018-05-31 Last updated: 2018-06-04Bibliographically approved

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Serovaiskii, Aleksandr YuMukhina, ElenaKutcherov, Vladimir G.

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