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  • Author or Editor: Ludovic Pinard x
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Abstract

Hydroconversion of n-decane was investigated on a series of platinum loaded ZSM-5 samples with varied Si/Al ratio. It was observed that the catalytic activity of ZSM-5 zeolite catalysts decreased with increasing Si/Al ratios in samples. The isomer selectivity in the platinum catalysts increased with the Si/Al ratio, which can be explained by a better balance between acidic and hydrogenating sites (high nPt/nH+ ratio = 0.3). On this catalyst, the olefinic intermediates formed on Pt come into contact with few acidic sites before encountering a Pt particle again on which they hydrogenate to be transformed into branched isomers. Among the various C10 isomers, 2-MeC9 was preferentially formed. On all catalysts, the content of linear products in the carbon number fractions is higher than branched products. This result is interpreted by type C hydrocracking of methylnonanes.

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Abstract  

The transformation of n-hexadecane was carried out in a fixed-bed reactor at 220 °C under 30 bar total pressure on bifunctional Pt-zeolite catalysts. The Pt-HBEA catalyst was very active but yielded much cracked products due to a rather strong protonic acidity. Pt–Na-HBEA catalysts obtained through partial exchange by sodium ions of the protonic sites of the HBEA zeolite were less active than Pt-HBEA but allowed to decrease significantly cracking. The effect of Na exchange on the activity of the catalysts was quantified using a kinetic model. Pt-HZSM-22 was much less active than Pt-HBEA but more selective for isomerization. However, the selectivity for isomerization of the Pt–Na-HBEA was very similar to that of Pt-HZSM-22 up to a 80% n-hexadecane conversion, while its activity was 2.5 times higher.

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