Structure-reactivity correlations in sulphated-zirconia catalysts for the isomerisation of α-pinene

Ecormier, Muriel A.; Wilson, Karen and Lee, Adam F. (2003). Structure-reactivity correlations in sulphated-zirconia catalysts for the isomerisation of α-pinene. Journal of Catalysis, 215 (1), pp. 57-65.

Abstract

A range of mesoporous sulphated zirconias with tuneable structural and catalytic properties have been prepared by direct impregnation. The surface sulphate coverage can be readily varied, achieving a maximum value of ∼0.2 monolayers. High-temperature calcination induces the crystallisation of tetragonal zirconia while suppressing the monoclinic phase and enhances surface acidity. Superacid sites only appear above a critical threshold SO4 coverage of 0.08 mL (corresponding to 0.44 wt% total S). Sulphated zirconias show good activity towards α-pinene isomerisation of under mild conditions. Conversion correlates with the number Brønsted acid sites, while the selectivity towards mono- versus polycyclic products depends on the corresponding acid site strength; superacidity promotes limonene formation over camphene.

Publication DOI: 10.1016/S0021-9517(02)00150-1
Divisions: Engineering & Applied Sciences > Chemical engineering & applied chemistry
Related URLs:
Uncontrolled Keywords: solid acid catalysts,clean technology,green chemistry,zirconia,α-pinene
Published Date: 2003-04-01

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