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 language | English |
|---|---|
| Pages (from-to) | 37908-37914 |
| Number of pages | 7 |
| Journal | RSC Advances |
| Volume | 7 |
| Issue number | 60 |
| DOIs | |
| Publication status | Published - Jan 1 2017 |
Fingerprint
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 journal › Article
}
TY - JOUR
T1 - Examining the molecular entanglement between V=O complexes and their matrices in atmospheric residues by ESR
AU - Cui, Qingyan
AU - Nakabayashi, Koji
AU - Ma, Xiaoliang
AU - Ideta, Keiko
AU - Miyawaki, Jin
AU - Marafi, Abdulazim M.J.
AU - Al-Mutairi, Adel
AU - Park, Joo Il
AU - Yoon, Seong-Ho
AU - Mochida, Isao
PY - 2017/1/1
Y1 - 2017/1/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85027382782&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85027382782&partnerID=8YFLogxK
U2 - 10.1039/c7ra06436e
DO - 10.1039/c7ra06436e
M3 - Article
AN - SCOPUS:85027382782
VL - 7
SP - 37908
EP - 37914
JO - RSC Advances
JF - RSC Advances
SN - 2046-2069
IS - 60
ER -