Finding of coal organic microspheres during hydrothermal treatment of brown coal

Qingxin Zheng, Masato Morimoto, Toshimasa Takanohashi

研究成果: Article査読

10 被引用数 (Scopus)


Solid wastes or extracts directly obtained from brown coals by a single hydrothermal treatment were found to be composed of a series of novel coal organic microspheres (COM). Treatment using a flow of water at 350 °C and 20 MPa for 90 min produced COM from three brown coals with carbon yields above 29% and diameters ranging of 0.2–3.8 μm. The spherical morphology of COM changes slightly with different resources, and some microcapsules were observed in all three COM samples. A recycling experiment on COM indicates their potential application as carriers and/or supporters after modification. Through comparison, it is demonstrated that COM differ completely from carbonaceous microspheres or hydrochars obtained from hydrothermal carbonization of carbohydrates, both in mechanism and starting materials. In addition, considering COM as a template, zinc oxide hollow microspheres were synthesized successfully. These results indicate that a series of new substitutes with stable supply are provided to organic microspheres, and a waste or by-product of through the hydrothermal treatment of brown coal is transformed to a valuable advanced material. Given their uniform morphology, high yields, and availability from a variety of low-cost natural resources with worldwide abundance, COM are expected to play a major role in chemical and materials science applications.

出版ステータスPublished - 2017

ASJC Scopus subject areas

  • 化学工学(全般)
  • 燃料技術
  • エネルギー工学および電力技術
  • 有機化学


「Finding of coal organic microspheres during hydrothermal treatment of brown coal」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。