Synthesis and characterization of nanostructured calcium oxides supported onto biochar and their application as catalysts for biodiesel production

RENEWABLE ENERGY

卷:160

Article

di Bitonto, Luigi¹  Elizabeth Reynel-Avila, Hilda^2,3  Ileana Mendoza-Castillo, Didilia^2,3  Bonilla-Petriciolet, Adrian³  Duran-Valle, Carlos J.^4,5  Pastore, Carlo¹ 

[1] Natl Res Council CNR, Water Res Inst IRSA, Via F de Blasio 5, I-70132 Bari, Italy

[2] Catedras CONACYT Jovenes Invest, Ciudad De Mexico 03940, Mexico

[3] Inst Tecnol Aguascalientes, Dept Chem Engn, Aguascalientes 20256, Aguascalientes, Mexico

[4] Univ Extremadura, Dept Organ & Inorgan Chem, Avd Elvas S-N, Badajoz 06006, Spain

[5] Univ Extremadura, ACYS, Avd Elvas S-N, Badajoz 06006, Spain

关键词: Biodiesel;    Nanostructured catalysts;    Heterogeneous catalysis;    Waste cooking oil;    FAME;   

DOI  :  10.1016/j.renene.2020.06.045

来源: Elsevier

【 摘 要 】

Nanostructured calcium oxides supported onto biochar obtained by pyrolysis of avocado seeds were prepared, characterized and successfully used as catalysts to produce biodiesel from waste oils. The effect of increasing calcium load (5, 10 and 20 wt%) was investigated. Elemental analysis, FTIR, XRD, SEM, BET, acid and basic sites were used to characterize the resulting carbon-based calcium oxides. Supported systems efficiently promoted the transesterification of oil with methanol, but differently from calcium oxide, they were easily recoverable and reusable for three cycles without any loss of activity. Kinetic data were better fitted by a pseudo-second order model with an activation energy of 39.9 kJ mol(-1). Thermodynamic parameters of activation energy were also determined for the transesterification reaction (Delta(double dagger) G: 98.68-106.08 kJ mol(-1), Delta(double dagger) H: 37.05 kJ mol(-1) and Delta S-double dagger: 0.185 kJ mol(-1) K). Finally, reaction conditions were optimized using the desirability function applied on the response surface methodology analysis of a Box-Behnken factorial design of experiments. By carrying out the reaction at 99.5 degrees C for 5 h with 7.3 wt% of catalyst and a molar ratio of methanol to oil of 15.6, a FAME content over 96% was achieved. Even starting from waste cooking oil, final biodiesel was conform to the main EN14214 specifications. (C) 2020 Elsevier Ltd. All rights reserved.

【 授权许可】

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