Abstract
Pyrolysis and hydrocracking of decalins, tetralin, and 1-methylna-phthalene as coal model compounds were studied to investigate the reaction mechanism in liquefaction of coal under initial hydrogen pressure of 0-50kg/cm2 at350-470°C for 1-13hr. Tetralin was the most unstable for thermal treatment, and converted to methylindans and to naphthalene plus decalins with nearly equal rate. A part of decalins and 1-methylnaphthalene reacted, but were relatively stable. When sulfur was added to these reaction system, dehydrogenation of decalins and tetralin was found to proceed stoichiometrically, and cis-/trans- isomerization of decalins was promoted remarkably. Demethylation and oligomerization of 1-methylnaphthalene were promoted in a similar nanner. Addition of phenolic compound depressed isomerization and disproportionation of tetralin. On hydrotreatment in the presence of Pd/carbon and Co-Mo/Al2O3 catalysts, dehydrogenation, demethylation and hydrogenation of aromatic ring were promoted. On the reaction over Fe/Si02-Al203 catalysts, decalins were hydrocracked to yield C3-C6 paraffins readily, tetralin underwent C-C bond scission and skeletal isomerization of naphthenic ring and alkylation. Methyl group migration of 1-methylnaphthalene to 2-methylnaphthalene arose overwhelmingly.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
