(66b) Isomerization of Hexane on Pt-Au Nanoparticles Supported on Zeolites
- Conference: AIChE Spring Meeting and Global Congress on Process Safety
- Year: 2008
- Proceeding: 2008 Spring Meeting & 4th Global Congress on Process Safety
- Group: AIChE / ACS Jointly Co-sponsored Sessions
- Time: Monday, April 7, 2008 - 2:30pm-3:00pm
It is planned to eliminate benzene and its derivatives from petrol and to replace them by methylated hydrocarbons, whence the importance of the isomerization of n-alkanes, which is currently performed in liquid superacid media, since current solid superacids are very rapidly poisoned. We show that some Pt-Au based zeolite catalysts can be useful in this reaction.
Samples were prepared according to reference  with 1% w/w of Pt and a ratio Au/Pt=20. UV-Visible, microtomy-EM and EDX spectroscopies show that the particles are essentially in the pores and are bimetallic.
The hydroisomerization of hexane was carried out at 200-350°C in a flow-type fixed-bed reactor. HY, Pt?HY and PtAu-HY are of no interest for this reaction. The efficiency of PtAu-HZSM5 is noteworthy; it is remarkably stable over one week with a selectivity and an activity for methylpentane of about 80% at 260°C. Moreover, cracking is negligeable, the other reaction products being i-C5 and i-C4.
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