Energy-efficient storage of methane in the formed hydrates with metal nanoparticles-grafted carbon nanotubes as promoter

Yuan-Mei Song, Fei Wang, Gang Guo, Sheng-Jun Luo and Rong-Bo Guo

Applied Energy, 2018, vol. 224, issue C, 175-183

Abstract: Despite hydrate technology provides an economical and safe method to transport and store natural gas, the large-scale utilization is still restricted by the long hydrate formation process and low gas storage capacity. To address above problems, a novel nanopromoter was synthesized by electrostatic adsorption and in-situ reduction of silver or copper ions on the supports of oxidized carbon nanotubes (symbolized as metal@OCNTs). In the methane hydrate formation, with nanoparticles fraction varied from 0 to 100%, the methane consumption was improved from 44 mmol/.mol water to 150 mmol.mol/water, among which Ag-grafted nanotubes performed better in accelerating hydrate formation. The increasing concentration of the nanopromoters led to reduced formation period to 125.1 min in 40 ppm Ag@OCNTs and 141.8 min in 40 ppm Cu@OCNTs. The optimum gas storage capacity was 153 V/V in 10 ppm Ag@OCNTs and 148.3 V/V in 20 ppm Cu@OCNTs. Moreover, the high methane recovery of 78.94% without foam generation was achieved during hydrate dissociation in the metals-grafted carbon nanotubes nanofluids. Hence, the metal nanoparticles-grafted CNTs could facilitate both high storage capacity in the rapid hydrate formation and high methane recovery, which is of great significance to the application of hydrate-based technologies in efficient energy storage and utilization.

Keywords: Methane hydrates; Metals grafted-carbon nanotubes; Formation enhancement; Gas storage capacity; Methane recovery (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0306261918306305
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:appene:v:224:y:2018:i:c:p:175-183

Ordering information: This journal article can be ordered from
http://www.elsevier.com/wps/find/journaldescription.cws_home/405891/bibliographic
http://www.elsevier. ... 405891/bibliographic

DOI: 10.1016/j.apenergy.2018.04.068

Access Statistics for this article

Applied Energy is currently edited by J. Yan

More articles in Applied Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().