A nano-platinum/SAPO-11 dual functional catalyst was prepared from hydrothermally synthesized SAPO-11 molecular sieve and used to study the hydroisomerization of n-C8, n-C12 and n-C16 alkanes. The Pt/SAPO-11 catalyst was prepared by vacuum impregnation and introducing element Sn to increase the dispersion of Pt particles. The XPS and TEM results indicated that the reduced Pt exist with Sn and Sn4+ in the form of high dispersion with the particle sizes of 3-5nm. The catalytic evaluation results of n-C8,n-C12 and n-C16 demonstrated that the catalyst had good isomerization activity and high selectivity due to appropriate acid center and hierarchical pore distribution. Yields for monomethyl-branched isomers and total branched isomers, ideal components for low freezing point diesel and high-grade lubricant base oil, were above 57% and 75%, respectively. The distribution of isomerization products was almost the same for n-alkanes of different chain lengths, which monomethyl-branched isomers were about 75% of total isomerization products, and monomethyl-branched isomers with methyl group at middle chain were 26% and 35% of total monomethyl-branched isomers for n-C12 and n-C16, respectively. Alkanes with longer chain, isomerization and hydrocracking reactions were more likely to occur. At the same conversion, the cracking product yield of n-C12 was 9%, and it can reach 15% for n-C16, long-chain n-alkanes showed increase in hydrocracking selectivity, but decrease in isomerization selectivity.

Isomerization performance of n-alkanes over nano-platinum/SAPO-11 catalyst

256th National Meeting (2018)

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