Jump to main content
Jump to site search

Issue 35, 2017
Previous Article Next Article

Grafting of nano-Ag particles on –SO3-coated nanopolymers for promoting methane hydrate formation

Author affiliations


Sodium dodecyl sulfate (SDS) has been reported to be the most efficient promoter for hydrate-based natural gas storage and transportation, however, foam generation during hydrate dissociation seriously affects its application. Nano-metal particles have also been demonstrated to be efficient promoters, nevertheless their poor stability is a serious problem. In this work, we first fixed –SO3 groups (similar to the hydrophilic group of SDS) covalently on polystyrene through soap-free emulsion polymerization to synthesize –SO3-coated nanopolymers, and by tuning their morphology they existed as amorphous polystyrene macromolecules (–SO3@PSMM) or uniform polystyrene nanospheres (–SO3@PSNS). Afterwards, we grafted nano-Ag particles with the size of 2–5 nm on the –SO3-coated nanopolymers through electrostatic adsorption and in situ reduction to prepare Ag&–SO3-coated nanopolymers (denoted as Ag&–SO3@PSMM and Ag&–SO3@PSNS), which were then used for the first time to promote methane hydrate formation. When 0.5 mmol L−1 amorphous Ag&–SO3@PSMM was used at an initial pressure of 6 MPa and temperature of 275.15 K, the induction period was 32.2 ± 7.9–60.8 ± 14.2 min, the growth period was 108.8 ± 8.2–177.1 ± 38.9 min and the methane storage capacity reached 143.9 ± 3.7–145.2 ± 1.2 v/v, whereas when the spherical Ag&–SO3@PSNS was used at 0.5 mmol L−1, the induction period and growth period were 17.8 ± 2.8–38.5 ± 8.0 and 39.6 ± 2.8–42.1 ± 0.9 min, respectively; and the storage capacity reached 149.3 ± 1.2–151.3 ± 3.0 v/v, indicating that Ag&–SO3@PSNS were much better promoters compared with Ag&–SO3@PSMM. Moreover, Ag&–SO3@PSNS exhibited excellent recycling performance for 10 cycles of methane hydrate formation–dissociation. To sum up, the Ag&–SO3-coated nano-promoters developed in this work showed significant potential in achieving the industrial application of hydrate-based natural gas storage and transportation.

Graphical abstract: Grafting of nano-Ag particles on –SO3−-coated nanopolymers for promoting methane hydrate formation

Back to tab navigation

Supplementary files

Publication details

The article was received on 01 Apr 2017, accepted on 17 Jul 2017 and first published on 17 Jul 2017

Article type: Paper
DOI: 10.1039/C7TA02830J
Citation: J. Mater. Chem. A, 2017,5, 18486-18493
  •   Request permissions

    Grafting of nano-Ag particles on –SO3-coated nanopolymers for promoting methane hydrate formation

    F. Wang, G. Guo, S. Luo and R. Guo, J. Mater. Chem. A, 2017, 5, 18486
    DOI: 10.1039/C7TA02830J

Search articles by author