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

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

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 - 2017

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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