Examining the molecular entanglement between V=O complexes and their matrices in atmospheric residues by ESR

Qingyan Cui, Koji Nakabayashi, Xiaoliang Ma, Keiko Ideta, Jin Miyawaki, Abdulazim M.J. Marafi, Adel Al-Mutairi, Joo Il Park, Seong-Ho Yoon, Isao Mochida

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Abstract

The V=O complexes in atmospheric residues (ARs) and their maltene, resin and asphaltene fractions have been investigated using ESR to examine the effects of the surrounding matrices, measurement temperature, pre-heat-treatment of AR as well as addition of toluene on the electron structure and mobility of the V=O ion. The B parameter calculated on the basis of the ESR spectrum has been found to be a good index to reflect the molecular entanglement between the V=O complexes and their matrixes in ARs and their fractions, and to indicate the effects of the measurement temperature, pre-heat-treatment as well as the solvent on such interactions. The B parameter value for the V=O complexes decreases in the order of asphaltenes > AR ≈ resins > maltenes, implying that the constraint on the mobility of the V=O complexes in the samples decreases in the same trend. Increasing temperature, pre-heat-treatment and the addition of toluene reduce the B parameter value, thus, favoring the mobility of the V=O complexes in the ARs and their fractions. It can be ascribed to the change in the peripheral environment of the V=O complexes surrounded by the matrix molecules. A comprehensive understanding of such molecular entanglement between the V=O complexes and their matrixes in ARs may give some important hints to improve the hydrodemetallization performance of AR.

Original languageEnglish
Pages (from-to)37908-37914
Number of pages7
JournalRSC Advances
Volume7
Issue number60
DOIs
Publication statusPublished - Jan 1 2017

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Paramagnetic resonance
Heat treatment
Toluene
Temperature measurement
Resins
Asphaltenes
Ions
Molecules
Electrons
Temperature
asphaltene

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

Examining the molecular entanglement between V=O complexes and their matrices in atmospheric residues by ESR. / Cui, Qingyan; Nakabayashi, Koji; Ma, Xiaoliang; Ideta, Keiko; Miyawaki, Jin; Marafi, Abdulazim M.J.; Al-Mutairi, Adel; Park, Joo Il; Yoon, Seong-Ho; Mochida, Isao.

In: RSC Advances, Vol. 7, No. 60, 01.01.2017, p. 37908-37914.

Research output: Contribution to journalArticle

Cui, Qingyan ; Nakabayashi, Koji ; Ma, Xiaoliang ; Ideta, Keiko ; Miyawaki, Jin ; Marafi, Abdulazim M.J. ; Al-Mutairi, Adel ; Park, Joo Il ; Yoon, Seong-Ho ; Mochida, Isao. / Examining the molecular entanglement between V=O complexes and their matrices in atmospheric residues by ESR. In: RSC Advances. 2017 ; Vol. 7, No. 60. pp. 37908-37914.
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