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Mechanisms of Asphaltene Aggregation: Puzzles and a New Hypothesis

Zhang, Yunlong ; Siskin, Michael ; Gray, Murray R ; Walters, Clifford C ; Rodgers, Ryan P

Energy & fuels, 2020-08, Vol.34 (8), p.9094-9107 [Periódico revisado por pares]

American Chemical Society

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  • Título:
    Mechanisms of Asphaltene Aggregation: Puzzles and a New Hypothesis
  • Autor: Zhang, Yunlong ; Siskin, Michael ; Gray, Murray R ; Walters, Clifford C ; Rodgers, Ryan P
  • É parte de: Energy & fuels, 2020-08, Vol.34 (8), p.9094-9107
  • Descrição: In petroleum science, asphaltenes are well-known as the most refractory fraction of crude oil and remain infamous for problems in production, transportation, and refining processes. Hence, they have been continuously analyzed and modeled over more than half a century. Defined only by solubility and characterized by an extremely complex and diverse molecular composition, asphaltenes lack discriminative molecular descriptions and definitive chemical characteristics. Most of the historic research has focused on representative structures in an attempt to yield physical and chemical models of asphaltenes, and thus, conflicting theories of bonding structures and aggregation interactions remain. This review focuses on the aggregation behavior of asphaltenes and attempts to rationalize a structure–property relationship to asphaltene aggregate thermal stability. Herein, the chemical and physical bonding properties of asphaltenes and the contradictory interpretations of their nature and composition are examined, particularly as they impact formation and stability of asphaltene aggregates. We propose a new hypothesis involving free radical interactions, i.e., pancake bonding, as an additional significant contributor to the bonding structure and formation of aggregates in asphaltenes that is consistent with the latest findings based on Fourier transform ion cyclotron resonance mass spectrometry and non-contact atomic force microscopy techniques. Various structural features of polycyclic aromatic hydrocarbons contributing to this interaction involving a stable free radical are highlighted, and suggestions for future research are presented.
  • Editor: American Chemical Society
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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