alpha-Pinene isomerisation over heteropoly acid catalysts in the gas-phase

作者：Alsalme Ali; Kozhevnikova Elena F; Kozhevnikov Ivan V^*

来源：Applied Catalysis A: General , 2010, 390(1-2): 219-224.

DOI：10.1016/j.apcata.2010.10.018

• Heterogeneous acid catalysis
• Heteropoly acid
• alpha Pinene isomerisation

The isomensation of a-pinene was studied in the gas phase over solid heteropoly acid (HPA) catalysts in a fixed-bed continuous flow reactor at 200 C and ambient pressure The catalysts included bulk and SiO2-supported H3PW12O40 and bulk Cs2 5H0 5PW12O40 possessing strong Bronsted acid sites as well as composites prepared by supporting 15 wt% H3PW12O40 on Nb2O5 ZrO2 and TiO2 possessing both Bronsted and Lewis acid sites of moderate strength The reaction yielded camphene as the main product in a mixture with monoterpene by-products such as limonene terpinolenes terpinenes beta-pmene p-cymene and others The HPA catalysts with strong Bronsted acid sites exhibited high initial activities but suffered from catalyst deactivation resulting in low camphene yields Conversely the HPA catalysts supported on Nb2O5 ZrO2 and TiO2 although weaker acids showed m

• 出版日期2010-12-20