Study of the Wettability of Coke by Different Pitches and Their Blends

Lu, Ying; Kocaefe, Duygu; Kocaefe, Yasar S.; Bhattacharyay, Dipankar; Coulombe, Patrick

doi:10.1021/acs.energyfuels.6b01891

Cited by 15 publications

(10 citation statements)

References 19 publications

(46 reference statements)

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“…that a higher value of this ratio is an indicator for improved coke−pitch interactions. 31 Improved interactions can enhance the wettability of coke by pitch. The ratio of Area COOH/NH/OH / Area Aliphatic for biopitches decreases by increasing biochars.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…This ratio is an indication of the active functional groups (COOH/NH/OH) in the sample, which may contribute to the wettability of pitch with respect to coke during the mixing stage. Acid–base interactions can take place between acidic functional groups, such as COOH and phenols, present on the interface of the pitch with coke. , An assumption was made that a higher value of this ratio is an indicator for improved coke–pitch interactions . Improved interactions can enhance the wettability of coke by pitch.…”

Section: Resultsmentioning

confidence: 99%

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Biochar as an Additive to Modify Biopitch Binder for Carbon Anodes

Hussein

Lauzon-Gauthier

et al. 2021

ACS Sustainable Chem. Eng.

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Looking for alternative materials to coal-tar pitch (CTP), as a binder in anode manufacturing, in aluminum production is of great interest. Such a material should be able to mitigate the cost and health issues without decreasing the carbon anode quality. Biopitch (BP) could be considered as a potential candidate. Previous studies show that biomass-based pitch has generally a low coking value compared to that of CTP, which might negatively affect its properties as a binder in carbon anodes. To increase its coking value, biopitch was modified by using additives. A solid bio-based material, namely, biochar, was considered as an additive. The prepared biopitch samples, containing different quantities of biochars, were analyzed for their softening point (SP), QI content, coking value (CV), molecular weight distribution, viscosity, surface tension, chemical groups, and surface composition, as well as their wettability with coke particles. The differences in texture and topography of different pitches, as well as the interface between pitch and aggregate particles in sessile drop after wettability test, were studied. The results revealed that increasing the quantities of biochars in biopitch increases their coking value, QI content, density, viscosity, and softening point. Furthermore, biochar addition only shows a minor influence on surface tension and molecular weight distribution of biopitch. An optimum amount (9.0 wt %) of biochar addition in biopitch could therefore be beneficial in anode formulation while using biopitch as a binder, compared to those of the reference anodes. The properties of the laboratory anodes (green/baked density, air/CO2 reactivity, compressive strength and electrical resistivity, carbon structure of the carbonized pitch) were investigated. Addition of biochar into biopitch could reduce the overall consumption of biopitch in the carbon anode formulation.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Biochar as an Additive to Modify Biopitch Binder for Carbon Anodes

Hussein

Lauzon-Gauthier

et al. 2021

ACS Sustainable Chem. Eng.

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“…Another quantitative spectroscopic technique, XPS was also used to measure the elemental composition and the nature of functional groups present in the surface of the ChOx‐gRGO‐PPy composite. The binding energy (BE) values were chosen based on published works . However there might be slight changes in the BE due to the presence of neighboring groups.…”

Section: Resultsmentioning

confidence: 99%

One Step Electrode Fabrication for Direct Electron Transfer Cholesterol Biosensor Based on Composite of Polypyrrole, Green Reduced Graphene Oxide and Cholesterol Oxidase

2018

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A simple single‐step fabrication of a novel biocomposite electrode was used for cholesterol sensing through direct electron transfer. The bio‐composite was prepared by polypyrrole, green reduced graphene oxide (gRGO) and cholesterol oxidase (ChOx). The graphene oxide (GO) was “green” reduced, with the Paederia foetide (PFL) plant extract at 60 °C to improve its biocompatibility. The adherence of gRGO to the electrode surface was improved through its co‐deposition during electro‐polymerization of pyrrole. Interestingly, the enzyme ChOx also could be immobilized during this co‐deposition process, resulting in one step biosensor fabrication. The optimization of electrochemical deposition parameters on glassy carbon electrode for this enzymatic bioelectrode (ChOx‐gRGO‐PPy/GCE) has resulted in excellent sensitivity (1095.3 μA mM−1 cm−2), wide linear range (0.01–6 mM), and low detection limit (3.78 μM) of cholesterol. Also, the Dubinin‐Radushkevitch (D−R) adsorption study revealed the occurrence of physisorption (ϵ=3.35) process in this bioelectrode, confirming diffusion‐controlled reaction. Reproducibility of electrodeposition procedure, impeccable selectivity in the presence of interferrants, repeatability for multiple use and long‐term stability for practical use were also ensured. This could be used to construct the cost‐effective device for cholesterol diagnosis.

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“…The abovementioned results appear to demonstrate that the CMFS is more disordered and defected with higher CO species, which have been reported to exhibit better sodiophilic ability and be more favorable for sodium ion diffusion. [ 24–25 ]…”

Section: Resultsmentioning

confidence: 99%

Low‐Barrier, Dendrite‐Free, and Stable Na Plating/Stripping Enabled by Gradient Sodiophilic Carbon Skeleton

Liang

Niu

et al. 2021

Advanced Energy Materials

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Na metal anodes have attracted widespread attention due to their ultrahigh specific capacity, low redox potential as well as the huge abundance and ubiquitous distribution of sodium resources. However, the practical application of Na metal anodes is largely hindered by their poor cycling stability and safety issues, mainly caused by the uneven deposition and terrible dendrite growth of metallic Na. To regulate the Na deposition behavior and direct uniform plating, herein, a “gradient sodiophilic” carbon skeleton prompted by the difference in the disorder degree and defect concentration is proposed. These extraordinary features render the as‐proposed structure a promising accommodation for metallic Na, with a low nucleation overpotential of only 11.1 mV at 10 mA cm–2 and a small polarization voltage of 12 mV at 5 mA cm–2 in symmetric batteries. Impressively, the resultant structure reveals outstanding advantages in suppressing Na dendrites and thus enables a dendrite‐free Na metal anode. The findings gained in this work provide solutions to construct stable and dendrite‐free Na metal anodes through tailoring the Na deposition behavior.

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Study of the Wettability of Coke by Different Pitches and Their Blends

Cited by 15 publications

References 19 publications

Biochar as an Additive to Modify Biopitch Binder for Carbon Anodes

Biochar as an Additive to Modify Biopitch Binder for Carbon Anodes

One Step Electrode Fabrication for Direct Electron Transfer Cholesterol Biosensor Based on Composite of Polypyrrole, Green Reduced Graphene Oxide and Cholesterol Oxidase

Low‐Barrier, Dendrite‐Free, and Stable Na Plating/Stripping Enabled by Gradient Sodiophilic Carbon Skeleton

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