Abstract
Hydroconversion of n-heptane was carried out in a high-pressure continuous plug-flow reactor system using catalysts containing hydrogen mordenite (HM): Pt HM , Re HM , PtRe HM and PtTh HM . Pt HM was found most selective for n-heptane isomerization, whereas PtRe HM and PtTh HM possessed comparable intrinsic isomerization activities and excellent centric hydrocracking selectivities. PtTh HM gave the highest iC 4 nC 4 ratio. The Thiele modulus and effectiveness factor were calculated as diffusion parameters over the temperature range studied (250°–400°C) for all catalysts. A correlation of these parameters with catalytic behaviour shed some light on the migration of metals during catalyst preparation. Platinum appears to migrate away from the pore mouth to the pore interior via promotion with either rhenium or thorium.
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