The kinetics of decalin ring opening over a Ir/H-Beta catalyst

Authors: Ali H. Alzaid, Kevin J. Smith

Abstract:
The selective ring opening of decalin over Pd/H-Y-30, Ir/H-Beta-300 and Ir/H-Beta-25 catalysts, measured in a stirred, batch reactor at 350 ^◦C and 3 MPa H₂, showed that Ir/H-Beta-25 (SiO₂/Al₂O₃ = 25) had the highest activity and yield of ring-opened products. The effect of temperature (275–350^◦C) and pressure (3–6 MPa) on the activity and product selectivity was further investigated over the Ir/H-Beta-25 catalyst. Thehighest ring-opened product yield (53 mol%) was obtained at a decalinconversionof 90 mol%at 325^◦C and 6 MPa H₂. A Langmuir–Hinshelwood kinetic model, that assumed a bifunctional catalytic process in which hydrogenation and dehydrogenation reactions occurred on metal sites and isomerization, ringopening and cracking occurred on acid sites, was successfully applied to the data. The model included the effect of catalyst deactivation associated with the catalyst acid sites. Activation energies estimated from the model parameters showed that the ring opening of isomers had the lowest activation energy (141 kJ/mol), whereas cracking had the highest (159 kJ/mol).

Keywords:
Catalyst
Ring opening
Bifunctional
Acidity
Kinetics
Deactivation
Iridium

Published in: Applied catalysis A: General  (Volume 450, Pages 1-274, 15 January 2013)

Publisher: Elsevier

ISSN Information: 0926-860X

The kinetics of decalin ring opening over a Ir/H-Beta catalyst

Bình luận của bạn

*

*

*

*

 Captcha

Gửi bình luận nhập lại