Release Time:2019-03-13  Hits:

Indexed by: Journal Article

Date of Publication: 2016-04-01

Journal: ENERGY & FUELS

Included Journals: EI、SCIE

Volume: 30

Issue: 4

Page Number: 3403-3412

ISSN: 0887-0624

Abstract: Hydroconversion of fluorene has been conducted over the zeolites and silica alumina-supported platinum catalysts. The hydrogenation of aromatic rings, the hydroisomerization of the cycloalkanes, and the cracking reaction over the Pt/ Y zeolite catalysts are studied to give a detailed hydroconversion reaction network of fluorene through conversion of the synthesized intermediates. Compared to the beta-zeolites and silica alumina supports used, the dispersed platinum catalysts on the Y-zeolites with unique cage structure and acidic properties selectively catalyze the ring -shift isomerization of perhydrofluorene with high yields of the dodecahydrocyclopenta[a]naphthalene and dodecahydrophenalene. Such hydroisomerization reaction is enhanced above 250 degrees C, while more cleavage of carbon carbon bond occurs at higher temperatures (280-290 degrees C) which lead to the great production of single-ring cycloalkanes and more loss in carbons. In the comparative study of the support effect, an examination of the product yields indicates that mild acidity and unique zeolitic structure of Y-zeolites show a major contribution to the selective ring -shift isomerization of saturated aromatic rings. In addition, the generation of mesopores in the Y-zeolite crystals by postsynthesis alkaline treatment facilitates the mass transfer of compounds and provides an improved yield of isomers.