The Application of Clinoptilolite as the Green Catalyst in the Solvent-Free Oxidation of α-Pinene with Oxygen

In this work, we present the catalytic application of naturally occurring zeolite, clinoptilolite, in oxidation α-pinene, a natural terpene compound. Clinoptilolites with different average particle sizes, designated as (in μm) clin_1 (20), clin_2 (50), clin_3 (200), and clin_4 (500–1000), were used green catalysts solvent-free α-pinene oxygen. Prior to their tests, characterized by following methods: nitrogen sorption at 77 K, EDXRF, XRD, SEM, UV-Vis, FTIR. The effects temperature, amount catalyst, reaction time on product’s selectivity conversion determined. At optimal conditions (a temperature 100 °C, catalyst content (clin_4) mixture 0.05 wt%, 210 min time), compounds obtained main products: oxide (selectivity 29 mol%), verbenol 17 verbenone 13 mol%). under these amounted 35 mol%. Additionally, kinetic modeling over most active was performed. proposed method is environmentally safe because it does not require separation products from solvent. addition, allows for managing biomass form turpentine, which source α-pinene. clinoptilolite has yet been reported literature.