Biodiesel production from waste cooking oil using a new heterogeneous catalyst SrO doped CaO nanoparticles


  • Apisit Prokaewa Department of Chemistry, Faculty of Science and technology, Thammasat University, Khlong Luang, Pathum Thani 12120, Thailand
  • Siwaporn Meejoo Smith Department of Chemistry, Faculty of Science and technology, Mahidol University, Phuttamonthon, Nakorn Pathom 73170, Thailand
  • Apanee Luengnaruemitchai The Petroleum and Petrochemical College, Chulalongkorn University, Pathumwan, Bangkok 10330, Thailand
  • Mathi Kandiah School of Science, BMS, 591, Galle Road, Colombo 06, Sri Lanka
  • Supakorn boonyuen Department of Chemistry, Faculty of Science and technology, Thammasat University, Khlong Luang, Pathum Thani 12120, Thailand



Waste palm oil, Calcium oxide catalyst, Strontium modified catalyst, Transesterication


Biodiesel production from waste palm cooking oil (WPCO) was studied. Calcium oxide with a strontium ion additive (Sr-CaO) was employed as a catalyst in transesterification reaction of used palm oil with methanol. The Sr-CaO was synthesized by co-precipitation method between SrCl2 and Ca(NO3)2, then calcined at 900°C for 5 h. The catalyst was characterized by using thermo-gravimetric analysis (TGA), X-ray diffraction (XRD), Scanning electron microscope (SEM), and Fourier transform infrared spectrometer (FT-IR). The morphology and elements content of Sr and Ca in the catalyst were confirmed by SEM-EDX. The approximate catalyst diameter is 12.6±5.9 µm. The highest conversion was 99.33% (the reaction time 3 h, 5%w/w catalyst, methanol to oil molar ratio 9:1 and reaction temperature 80°C). The catalyst can be used up to the sixth cycles with a good yield. The synthesized biodiesel meet the requirement of standard biodiesel (EN 14103 and ASTM D445). These findings suggest that calcium oxide with a strontium ion additive (Sr-CaO) is an effective renewable biodiesel catalyst.


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How to Cite

A. . Prokaewa, S. . Meejoo Smith, A. . Luengnaruemitchai, M. . Kandiah, and S. boonyuen, “Biodiesel production from waste cooking oil using a new heterogeneous catalyst SrO doped CaO nanoparticles”, J Met Mater Miner, vol. 32, no. 1, pp. 79–85, Mar. 2022.



Original Research Articles