Abstract
This study examined the effect of the Sr concentration in SrK/CaO catalysts based on oyster shells for the transesterification of canola oil. The CaO support was obtained by mixing 800 °C calcined oyster shell and limestone. Then, K and Sr were impregnated simultaneously at three different Sr/(Sr + K) molar ratios, 0.2, 0.3, and 0.4, and calcined at 800 °C. XRD, SEM, and Hammett indicators were used to characterize the catalysts. The reaction conditions were 60 °C, 1 h, met/oil = 12.5, and a catalyst loading of 7 wt%. The results showed that a Sr/(Sr + K) = 0.3 produces larger K2Sr(CO3)2 crystals that contribute synergistically to the catalytic activity. At Sr/(Sr + K) > 0.3, the K and Sr are segregated, decreasing the alkaline character and activity. Also, the optimization of WCO transesterification conditions was carried out by Box–Behnken response surface design with SrK/CaO-0.3 catalyst. The theoretical optimal conditions were 70 °C, 1.5 h, and a met/oil = 10, which achieved 79 % of biodiesel yield. Nonetheless, the produced WCO biodiesel did not present acceptable quality, and this reactive system increased the lixiviation of the active phases.
Acknowledgments
Authors thank CONAHCYT for project 216 of Investigadores por México-CONAHCYT program. Tavizón-Pozos thanks to Laura Aranda for her support and love.
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Research ethics: The authors declare that this is an original article.
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Author contributions: The authors have accepted responsibility for the entire content of this manuscript and approved its submission. E.A. Ramírez-Paredes: experimental, writing. J.A. Rodriguez: Infraestructure. G. Chavez-Esquivel: experimental, interpretation. J.A. Tavizón-Pozos: experimental, interpretation, writing, conception.
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Competing interests: The authors state no competing interests.
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Research funding: None declared.
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Data availability: Not applicable.
References
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© 2024 Walter de Gruyter GmbH, Berlin/Boston
Articles in the same Issue
- Frontmatter
- Editorial
- Professor M. Mozahar Hossain joins IJCRE as co-chief editor
- Articles
- Segregation and mixing of binary mixtures of spherical particles in a bubbling fluidized bed
- Thermodynamic and kinetic study on the catalysis of tributyl aconitate by Amberlyst-15 in a cyclic fixed-bed reactor
- Design, characterization and performance evaluation of a laboratory-scale continuous reactor for sono-Fenton treatment of simulated wastewater
- Airlift bioreactors for bioremediation of water contaminated with hydrocarbons in agricultural regions
- R dot approach for kinetic modelling of WGS over noble metals
- Ethyl acetate production by Fischer esterification: use of excess of acetic acid and complete separation sequence
- VOCs (toluene) removal from iron ore sintering flue gas via LaBO3 (B = Cu, Fe, Cr, Mn, Co) perovskite catalysts: experiment and mechanism
- Effect of Sr concentration in SrK/CaO oyster shell derived catalysts for biodiesel production
- CFD-PBM simulation of power law fluid in a bubble column reactor
- Retraction
- Retraction of: Computational fluid dynamic simulations to improve heat transfer in shell tube heat exchangers
Articles in the same Issue
- Frontmatter
- Editorial
- Professor M. Mozahar Hossain joins IJCRE as co-chief editor
- Articles
- Segregation and mixing of binary mixtures of spherical particles in a bubbling fluidized bed
- Thermodynamic and kinetic study on the catalysis of tributyl aconitate by Amberlyst-15 in a cyclic fixed-bed reactor
- Design, characterization and performance evaluation of a laboratory-scale continuous reactor for sono-Fenton treatment of simulated wastewater
- Airlift bioreactors for bioremediation of water contaminated with hydrocarbons in agricultural regions
- R dot approach for kinetic modelling of WGS over noble metals
- Ethyl acetate production by Fischer esterification: use of excess of acetic acid and complete separation sequence
- VOCs (toluene) removal from iron ore sintering flue gas via LaBO3 (B = Cu, Fe, Cr, Mn, Co) perovskite catalysts: experiment and mechanism
- Effect of Sr concentration in SrK/CaO oyster shell derived catalysts for biodiesel production
- CFD-PBM simulation of power law fluid in a bubble column reactor
- Retraction
- Retraction of: Computational fluid dynamic simulations to improve heat transfer in shell tube heat exchangers