Catalytic transformation of camphene over aluminophosphate-based molecular sieves

Abstract

The catalytic transformation of camphene over AlPO₄-5, AlPO₄-11, SAPO-5, SAPO-11, VAPO-5, VAPO-11, CoAPO-5, CoAPO-11, NAPO-5, NAPO-11, ZAPO-5 and ZAPO-11 in the vapour phase has been studied. The products formed are tricyclene, bornylene and monocyclic terpenes. The product distribution is influenced by both acidity and inverse weight hourly space velocity (WHSV)^–1. Selective formation of tricyclene is envisaged over weak acid sites and with lower (WHSV)^–1, while the monocylics like dipentene, terpinolene, α- and τ-terpinenes, p-menthene and p-cymene are formed over strong acid sites. The effect of temperature on conversion and product distribution, and the effect of acidity and (WHSV)^–1 on the distribution of monocyclics have also been investigated.