Abstract
The influence of the preparation method, the nature of the precursor compound and acid treatment on hydroisomerization of n-butane over bifunctional Pd/HZSM-5 catalysts was investigated to obtain active and highly selective catalysts. Temperature-programmed desorption of ammonia, atomic absorption spectroscopy, chemisorption, temperature-programmed reduction and transmission electron microscopy techniques were used to characterize the catalysts. Pd(NO 3) 2 was selected as metal precursor, because calcination of this compound can be carried out in a furnace under static air atmosphere without needing careful temperature control. A catalyst with a palladium loading of 0.53 wt.% exhibited good isomerization performance, which was further improved by severe acid treatment, as a higher strong acid-site density was obtained. The selected catalyst led to a total conversion of 35.3 mol% and a high selectivity of 78%.
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