Ring-opening of β-pinene epoxide into high-added value products over Colombian natural zeolite

Add time:09/24/2019    Source:sciencedirect.com

A natural zeolite presents in rocks of volcanic origin located in Colombia was characterized and tested for the isomerization of β-pinene epoxide. The material was characterized by TPD-NH3, BET, SEM, FRX, FTIR of adsorption-desorption of pyridine, TPD-CO2 and TPR-H2. It was found that 65% of the acidity was strong and 75% was Lewis type; the material also had strong basicity (57%), and a surface area of 34.9 m2 g−1. The effect of different parameters such as kind of solvent (ethanol, THF, dioxane, acetone and toluene), concentration of catalyst, temperature and time on catalysts activity was evaluated in the ring-opening reaction of β-pinene epoxide. The maximum conversion (97%), selectivities to perillyl alcohol (47%), myrtanal (23%) and myrtenol (12%) were obtained with toluene (70 °C, 2.5 h). A reaction mechanism was proposed based on the experimental and theoretical results for explaining the formation of the products synthetized from the catalytic reaction over Brönsted and Lewis acid sites. The catalyst was reused five times without apparent loss of conversion, but with a slight decreasing of selectivity to perillyl alcohol and increase of selectivity to myrtanal and myrtenol.

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