Potential of sustainable hierarchical zeolites in the valorization of α-pinene

ChemSusChem
Nicolas NuttensBert F Sels

Abstract

In the valorization of α-pinene, which is an important biomass intermediate derived from turpentine oil, hierarchical (mesoporous) zeolites represent a superior class of catalysts. Hierarchical USY, ZSM-5, and beta zeolites have been prepared, characterized, and catalytically evaluated, with the aim of combining the highest catalytic performance with the most sustainable synthetic protocol. These zeolites are prepared by alkaline treatment in aqueous solutions of NH4 OH, NaOH, diethylamine, and NaOH complemented with tetrapropylammonium bromide. The hierarchical USY zeolite is the most attractive catalyst of the tested series, and is able to combine an overall organic-free synthesis with an up to sixfold activity enhancement and comparable selectivity over the conventional USY zeolite. This superior performance relates to a threefold greater activity than that of the commercial standard, namely, H2 SO4 /TiO2 . Correlation of the obtained benefits to the amount of solid lost during the postsynthetic modifications highlights that the highest activity gains are obtained with minor leaching. Furthermore, a highly zeolitic character, as determined by bulk XRD, is beneficial, but not crucial, in the conversion of α-pinene. The alkali...Continue Reading

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Citations

Dec 23, 2015·Chemical Society Reviews·Thijs EnnaertBert F Sels
Mar 1, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Mariusz Gackowski, Jerzy Datka
Sep 12, 2020·Chemical Reviews·Li-Hua ChenBao-Lian Su

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