One-step production of biodiesel through simultaneous esterification and transesterification from highly acidic unrefined feedstock over efficient and recyclable ZnO nanostar catalyst

Tsz Lung Kwong, Ka Fu Yung

Research output: Journal article publicationJournal articleAcademic researchpeer-review

26 Citations (Scopus)


Zinc oxide (ZnO) nanostar synthesized by simple and up-scalable microwave-assisted surfactant free hydrolysis method was applied as catalyst for biodiesel synthesis through one-step simultaneous esterification and transesterification from high free fatty acid (FFA) contaminated unrefined feedstock. It was found that ZnO nanostar catalyst was reacted with FFA to yield zinc oleate (ZnOl) as intermediate and finally became zinc glycerolate (ZnGly). With the re-deposition of ZnGly back to the ZnO nanostar catalyst at the end of the reaction, the catalyst can be easily recovered and stay active for five cycles. Furthermore, the rate of transesterification is highly promoted by the presence of FFA (6 wt.%) which makes it an efficient catalyst for low grade feedstock like waste cooking oil and crude plant oils.
Original languageEnglish
Pages (from-to)450-457
Number of pages8
JournalRenewable Energy
Publication statusPublished - 1 May 2016


  • Biodiesel
  • Free fatty acid
  • Simultaneous esterification and transesterification
  • Zinc oxide

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment

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