Work

Zn supported on composite materials as catalysts for fine chemical applications

Year: 2025

Type: article

Abstract: • Limonene epoxides were selectively obtained over Zn-BTCa. • Only myrtanal was obtained from β-pinene epoxide isomerization over Zn-BTAlMg. • Campholenic aldehyde was obtained in one-pot reaction from α-pinene over Zn-BTCa. • Composite supports combine hydrophilic-hydrophobic properties. In this work, zinc supported composite catalysts were evaluated in the isomerization of β-pinene epoxide, limonene oxidation, and one pot synthesis of campholenic aldehyde from α-pinene. The composites materials were synthesized using CaCO 3 and a mixture of aluminium and magnesium sources as the inorganic phases and the bisphenol A glycerolate dimethacrylate / triethylene glycol dimethacrylate polymerized mixture as the polymeric organic phases. The materials were characterized by NH 3 -TPD, CO 2 -TPD, XRD, Py-FTIR, XPS, ICP, TEM and SEM-EDX. Mainly Lewis acid sites were identified by Py-FTIR analysis of BTAlMg and Zn-BTAlMg. The basicity of BTCa and Zn-BTCa materials was identified by CO 2 -TPD. Over Zn-BTCa, α-pinene conversion of 73 % and campholenic aldehyde selectivity of 90 % were obtained. The oxidation of limonene over Zn-BTCa yielded a conversion of 36 % with a selectivity of 92 % and 8 % towards 1,2-limonene epoxide and 8,9-limonene epoxide, respectively. The isomerization of β-pinene epoxide over Zn-BTAlMg with dimethyl carbonate, gave 89 % β-pinene epoxide conversion and 100 % selectivity to myrtanal. The synthesized catalysts did not show leaching under tested catalytic reactions. After four reuses, the product selectivity did not significantly changed and the conversion decreased 7 % and 11 % in the oxidation of α-pinene and isomerization of β-pinene epoxide, respectively.

Source: Molecular Catalysis

DOI: 10.1016/j.mcat.2025.115012