Evaluation of the Isomerization of α-Pinene Epoxide to Campholenic Aldehyde Using a Catalyst Obtained from Orange Peels (Citrus sinensis)

• Aída Luz Villa Environmental Catalysis Research Group, Chemical Engineering Department, Universidad de Antioquia, Medellín, Antioquia, Colombia https://orcid.org/0000-0002-3770-3223
• Marta Mediavilla Facultad de Ingeniería, Universidad Central de Venezuela, UCV, P.O. Box 48.057, Caracas 1041-A, Venezuela https://orcid.org/0000-0001-9010-9795

DOI: https://doi.org/10.22209/rt.v46a03

Keywords: carbon, mesoporous, terpenes, waste, XRD

Abstract

Orange peels (Citrus sinensis) are an abundant lignocellulosic residue that can be used as a carbon source to obtain solids with catalytic potential in the transformation of terpenes and their oxides into value-added products. This research seeks to evaluate the isomerization of α-pinene epoxide to campholenic aldehyde using a catalyst obtained from orange peels. The material OAC-Zn was obtained by activation of orange peel with ZnSO₄.7H₂O followed by thermal treatment at 500 °C; an additional solid was obtained from orange peel by pyrolysis at 500 °C (OC-500). XRD revealed the presence of ZnO and ZnS in OAC-Zn; TGA analysis indicated thermal stability in OAC-Zn and OC-500 materials; SEM images showed porous surfaces of different morphology, and the presence of microporosity in OC-500 and mesoporosity in the OAC-Zn that was confirmed by physical nitrogen adsorption. The elements C, O, Zn and S was identified in OAC-Zn by EDX analysis. The results of TPD-NH₃ showed that the solids contained medium and weak acidity. Campholenic aldehyde was synthesized with a 96 % selectivity over a mesoporous carbonaceous material obtained from orange peels using ZnSO₄.7H₂O as activating agent

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