Asphalt as raw material of graphene-like resources

Fernández, Salvador; Mercado, Alfonso; Cuara, Edgar; Yeverino‐Miranda, Claudia Y.; Sierra, Uriel

doi:10.1016/j.fuel.2018.12.026

Cited by 14 publications

(2 citation statements)

References 30 publications

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“…Because of its high content of polycyclic aromatic hydrocarbons (PAHs), asphalt can also be used as a carbon source to fabricate carbon materials. In recent years, graphene derivatives and hierarchical porous carbon have been synthesized from petroleum asphalt. , In the laboratory, asphalt can be carbonized under tightly controlled reaction conditions; however, its counterpart used in civil engineering applications is exposed to light, heat, and oxygen for long periods of time and is more susceptible to oxidative aging. Oxidation changes the molecular structure of asphalt, making the asphalt harder and more brittle, and thus reduces the service performance of asphalt pavement and waterproofing products …”

Section: Introductionmentioning

confidence: 99%

Modeling the Oxidative Aging Kinetics and Pathways of Asphalt: A ReaxFF Molecular Dynamics Study

Cui

et al. 2020

Energy Fuels

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The ReaxFF molecular dynamics simulations, which can predict chemical reactions, were performed on integral asphalt and individual asphalt molecules at different temperatures and oxygen levels to investigate the oxidation mechanism of asphalt and develop a molecular model suitable for aged asphalt. The simulation of integral asphalt suggests that the main oxidation products of asphalt are C–O, H–O, and S–O bonds. The oxygen level has the greatest influence on the yield of C–O bonds, and the temperature has the greatest influence on the H–O bonds. The simulation of individual asphalt molecules indicated that the oxidation of asphalt is accompanied by the decomposition of the aromatic rings, and thus, the aromaticity of the oxidized asphalt is decreased. Oxidation of asphaltenes starts with the oxygen molecules attacking the aromatic ring and generating a ketone, while the initial reactions of the other components are diverse. In addition, the simulation results were validated with Fourier transform infrared spectroscopy and nuclear magnetic resonance tests and were used to study the effects of oxidation on the characteristics of asphalt. The results suggested that the introduction of oxygen-containing functional groups decreases the component compatibility of asphalt and causes the aged asphalt to be harder and more viscous.

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Section: Introductionmentioning

confidence: 99%

Modeling the Oxidative Aging Kinetics and Pathways of Asphalt: A ReaxFF Molecular Dynamics Study

Cui

et al. 2020

Energy Fuels

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“…The resulting graphene or graphene-like substructure is expected to be precursors for the construction of carbon-based materials with various morphologies. In recent years, some efforts − have been made toward the design of effective catalysts from petroleum pitch, which provides a feasible reference to fabricate low-cost catalysts for nitroaromatics reduction.…”

Section: Introductionmentioning

confidence: 99%

Template-Oriented Synthesis of Fe–N-Codoped Graphene Nanoshells Derived from Petroleum Pitch for Efficient Nitroaromatics Reduction

Tan

et al. 2019

Ind. Eng. Chem. Res.

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In this study, we demonstrate noble metal-free Fe–N-codoped graphene nanoshells (Fe–N/GNS) derived from petroleum pitch as highly efficient and cost-effective catalysts for nitroaromatics reduction. By employing α-Fe2O3 nanoparticles simultaneously as both the hard template and the metal source, Fe–N/GNS can be facilely synthesized through the template-oriented method, followed by thermal annealing with urea for nitrogen doping. Owing to the high-dispersed synergetic Fe–N active sites as well as the hierarchical porous nanoshell structure, the Fe–N/GNS catalysts show remarkable catalytic performance and good tolerance for the reduction of nitroaromatics with NaBH4 aqueous solution. The optimized Fe–N/GNS-800 corresponds to pseudo-first-order kinetics for p-nitrophenol reduction at room temperature, with the rate constant (k) reaching 1.23 min–1. The reinforced structure also allows the catalyst to be readily recycled a dozen times without activity deterioration. This work may provide a new avenue to facilely fabricate cost-effective but powerful catalysts for nitroaromatics reduction and beyond.

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Controlling synthesis of nitrogen-doped hierarchical porous graphene-like carbon with coral flower structure for high-performance supercapacitors

Chen

Yang

et al. 2019

Ionics

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Asphalt as raw material of graphene-like resources

Cited by 14 publications

References 30 publications

Modeling the Oxidative Aging Kinetics and Pathways of Asphalt: A ReaxFF Molecular Dynamics Study

Modeling the Oxidative Aging Kinetics and Pathways of Asphalt: A ReaxFF Molecular Dynamics Study

Template-Oriented Synthesis of Fe–N-Codoped Graphene Nanoshells Derived from Petroleum Pitch for Efficient Nitroaromatics Reduction

Controlling synthesis of nitrogen-doped hierarchical porous graphene-like carbon with coral flower structure for high-performance supercapacitors

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