Work

Biodiesel Production Using K–Sr/CaO and CaO Catalysts Derived from Eggshells by Canola Oil Transesterification

Year: 2025

Type: article

Abstract: Eggshell calcination at 900 °C was used to produce CaO, which was afterward impregnated with K and Sr using KNO3 and SrCl2·6H2O precursors, diluted in methanol, to improve basicity, stability, and catalytic activity. The CaO doping with K–Sr affected the final catalyst’s textural properties, alkalinity, and basic strength due to the K+ and Sr2+ size and incorporation into the CaO lattice. SEM images with elemental mapping showed a uniform K+ and Sr2+ distribution for the K–Sr/CaO catalyst. However, carbonization modified the basic strength and the number of catalytic sites. The fresh K–Sr/CaO and CaO catalysts presented 92.5% and 46% biodiesel yields, respectively. In the third reaction cycle, the biodiesel yield dropped to approximately 72% and 21%, respectively. In this sense, the method of doping CaO with K and Sr increased the basic strength and number of basic sites for the K–Sr/CaO catalyst, providing higher resistance to leaching compared to the CaO catalyst. Finally, the enhanced conditions were 7.0 wt % catalyst loading, a 12.5:1 methanol/oil molar ratio, 70 °C, and a 1 h reaction time.

Source: ACS Omega

DOI: 10.1021/acsomega.4c09118

Authors: Jesús Andrés Tavizón-Pozos, Humberto Cervantes-Cuevas, Germán Gustavo Garcia-Camacho, Gerardo Chavez-Esquivel, Dwight Roberto Acosta-Najarro

Institutions: Universidad Autónoma Metropolitana, Universidad Nacional Autónoma de México

Language: English

Topic: Biodiesel Production and Applications

Subfield: Biomedical Engineering

Field: Engineering

Domain: Physical Sciences

SDGs: Affordable and clean energy, Responsible consumption and production

Open Access status: gold

Estimated APC paid: $1,935