Effects of multiwalled carbon nanotubes on CH<sub>4</sub> hydrate in the presence of tetra-<i>n</i>-butyl ammonium bromide

Li, Dongliang; Sheng, Shu-Mei; Zhang, Ye; Liang, Deqing; Wu, Xiaoping

doi:10.1039/c8ra01124a

Cited by 9 publications

(7 citation statements)

References 54 publications

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“…Over the whole course of the experiment (0–35 min), the formation rate of the TBAB-containing system was greater than that of the pure ice powder because TBAB enhances hydrate formation. 40 …”

Section: Resultsmentioning

confidence: 99%

“…However, with an increase in time, the rate of hydrate generation decreased below those of the other systems; this is because carbon dioxide is consumed rapidly during gas charging, so a large amount of hydrate is formed, and the generation rate between 5 and 10 min is lower than those of the other systems. Over the whole course of the experiment (0–35 min), the formation rate of the TBAB-containing system was greater than that of the pure ice powder because TBAB enhances hydrate formation …”

Section: Resultsmentioning

confidence: 99%

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Effects of Composite Accelerators on the Formation of Carbon Dioxide Hydrates

et al. 2022

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To improve the rate of formation of carbon dioxide hydrates, tetra- n -butylammonium bromide (TBAB) was compounded with different concentrations of sodium dodecyl sulfate (SDS) and nanographite, and the effects of these mixtures on carbon dioxide hydrate formation were studied. The addition of TBAB alone, as well as mixtures of TBAB and SDS or nanographite, shortened the induced nucleation time, and the induction times of the TBAB–2.5 g/L nanographite and TBAB–0.24 g/L SDS systems were the shortest and longest, respectively. Further, on mixing TBAB and SDS, the induced nucleation time first increased and then decreased with the increase in the SDS concentration. When TBAB and nanographite were mixed together, the induced nucleation time first decreased, then increased, and again decreased with the increase in the nanographite concentration. In addition, the hydrate formation rate and conversion were highest for the TBAB–0.48 g/L SDS system and lowest for the TBAB–0.06 g/L SDS system; in the first 35 min, from the end of gas charging, the TBAB–10 g/L nanographite and TBAB–5 g/L nanographite systems yielded the highest and lowest hydrate formation rates and conversions, respectively. For the composite systems, obvious effects were observed in the initial stages of reaction, but the effects varied over the course of the reaction. Overall, the use of different accelerators resulted in little differences in the total production, conversion, and formation rate of carbon dioxide hydrates over the course of the reaction.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Effects of Composite Accelerators on the Formation of Carbon Dioxide Hydrates

et al. 2022

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“…In single-accelerator systems, the generated amount with TBAB was slightly larger than that with SDS and notably larger than that with nanographite. According to the analysis of the influencing factors of the three accelerators, TBAB promotes hydrate formation by alleviating the conditions of hydrate formation, yielding the best promoting effect. This is followed by SDS, which promotes hydrate formation by increasing the solubility and contact area of gas .…”

Section: Resultsmentioning

confidence: 99%

Effects of the Presence of Promoters Sodium Dodecyl Sulfate, Nanographite, and Tetra-n-butylammonium Bromide on the Formation of CO₂ Hydrates

et al. 2022

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Carbon dioxide hydrates have attracted considerable attention because of their high gas storage capacity and low-cost carbon capture, but their low formation rate limits their application. Currently, the formation rate of hydrates is mainly improved via physical and chemical methods. Chemical methods promote hydrate formation through the addition of accelerators, which entail low cost and energy. To improve the formation rate of CO2 hydrates, 0.244 g/L sodium dodecyl sulfate (SDS), 0.288 g/L tetra-n-butylammonium bromide (TBAB), and 0.33 g/L nanographite were used, and the effects of different accelerator systems on CO2 hydrate formation were observed. The results show that the single and combined use of promoters SDS, TBAB, and nanographite can shorten the induced CO2 hydrate nucleation time. The combinations of nanographite–TBAB and SDS–TBAB shortened the induced nucleation time better than the single SDS, TBAB, and nanographite systems, while the single SDS and nanographite systems showed better promoting effect compared to the SDS–nanographite system. Thus, the combined accelerators do not necessarily promote the formation of hydrates. Among all accelerator systems, SDS–TBAB showed the shortest induced nucleation time, followed by the other three combinations. Among the single acceleration systems, TBAB showed the largest formation amount, formation rate, and conversion rate in the first 35 min from inflation stoppage. Meanwhile, among the compound systems, SDS–TBAB exhibited the best promoting effect. A comparison of all experiments shows that the accelerator significantly affects the formation amount, conversion, and formation rate of hydrates 35 min before the start of inflation; furthermore, a different effect is observed in the subsequent period. The total production, conversion, and saturation of CO2 hydrates in different accelerator systems show a minimal difference. By providing reference for the rapid formation of CO2 hydrates in a short time, this study promotes the industrial application of hydrate technology.

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“…From these works, it is known that although some nanoparticles affect the phase equilibrium of hydrates, the amount of phase equilibrium changes reported is small, except for the work of Li et al, where ZnO and GP shifted the hydrate phase equilibrium to the left, while MWCNTs showed different effects depending on the experimental conditions. Although the sample sizes and effects of nanoparticles on hydrate phase equilibria in the aforementioned works were both tiny, we are afraid that this cannot be used to definitively refute the veracity of these investigations.…”

Section: Discussion Of the Effect Of Nanofluids On Hydrate Phase Equi...mentioning

confidence: 99%

“…Additionally, as shown in Figure 4, the changes in the phase equilibrium of methane hydrate for various varieties of multiwalled carbon nanotubes are similar. Li et al 52 came to a different conclusion, nevertheless. The phase equilibrium curves of methane hydrate were changed toward higher pressure and lower temperature in the presence of 38.5 wt % TBAB by MWCNTs, regardless of concentration.…”

Section: Discussion Of the Effect Of Nanofluids On Hydrate Phase Equi...mentioning

confidence: 99%

Application of Nanofluids in Rapid Methane Hydrate Formation: A Review

et al. 2022

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The use of hydrate-based technologies for gas storage and transportation, carbon capture and sequestration, desalination, and cold energy utilization is gaining popularity. Unfortunately, the slow formation kinetics of hydrates constrains the development of these technologies. Nanofluids have received widespread attention as they can effectively improve the formation kinetics of hydrates. Accordingly, this review examines the history of nanofluid use in rapid hydrate formation as well as the mechanisms of action of various nanofluids. Furthermore, the performance of various nanofluids is fairly assessed, and their performance is compared to that of other systems. Finally, current nanofluid challenges and constraints are discussed, as well as future development recommendations.

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Effects of multiwalled carbon nanotubes on CH₄ hydrate in the presence of tetra-n-butyl ammonium bromide

Abstract: Hydrate formation is an important technology for gas storage and transportation.

Cited by 9 publications

References 54 publications

Effects of Composite Accelerators on the Formation of Carbon Dioxide Hydrates

Effects of Composite Accelerators on the Formation of Carbon Dioxide Hydrates

Effects of the Presence of Promoters Sodium Dodecyl Sulfate, Nanographite, and Tetra-n-butylammonium Bromide on the Formation of CO₂ Hydrates

Application of Nanofluids in Rapid Methane Hydrate Formation: A Review

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Effects of multiwalled carbon nanotubes on CH4 hydrate in the presence of tetra-n-butyl ammonium bromide

Abstract: Hydrate formation is an important technology for gas storage and transportation.

Cited by 9 publications

References 54 publications

Effects of Composite Accelerators on the Formation of Carbon Dioxide Hydrates

Effects of Composite Accelerators on the Formation of Carbon Dioxide Hydrates

Effects of the Presence of Promoters Sodium Dodecyl Sulfate, Nanographite, and Tetra-n-butylammonium Bromide on the Formation of CO2 Hydrates

Application of Nanofluids in Rapid Methane Hydrate Formation: A Review

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Effects of multiwalled carbon nanotubes on CH₄ hydrate in the presence of tetra-n-butyl ammonium bromide

Effects of the Presence of Promoters Sodium Dodecyl Sulfate, Nanographite, and Tetra-n-butylammonium Bromide on the Formation of CO₂ Hydrates