Light Alkane Isomerization And Aromatization Reactions

For satisfying the requirements of environmental protection, the content of isomeric alkane ingasoline should be increased. There are several methods to increase the content of isomeric alkaneand the isomerization is an ideal choice. Since 1980s, C₅/C₆ paraffin's isomerization process hasbeen kept developing rapidly overseas with respect to the environmental protection. In 1990s, wehave set an even higher standard for the quality of gasoline with development of automobile industryand sense of environmental protection in our country, it has great importance to have this technologyapplied to the industrial production for changing gasoline composition and improving its quality inchina.The aromatization of alkanes are significant in the fields of energy utilization and catalysisscience. The light aromatics (BTX) or high octane number gasoline are produced by thearomatization technology for different demands. The fixed bedreactor or thermofor bed reactor isselected. In future, it is necessary to increase the catalyst selectivity and the function.In the first of the thesis, solid superacid, isomerization, aromatization of low-alkanes, thedefinition application in organic chemistry of superacid and deactivity was introduction; and theprogresses of low-alkanes in isomerization and aromatization also were reviewed.In the second part of the thesis, isomerization of cyclohexane was investigated usedSSO₄～(2-)/Fe₂O₃-CoO catalyst in bedreactor. The methods of the catalyst were prepared, and the catalystwas characterized by FT-IR, SEM and XPS spectra, and the products were analyzed by GC/MS. Weanalyzed the products of the reaction in different time by GC/MS, indicating four products assignedto dicyclohexane, ethylcyclohexane, 2.4-dimethyl-2-hexene and ethylbenzene, respectively. In theend of the paper, the mechanism of reaction was concluded.In the third part of the thesis, aromatization of cyclohexane was investigated usedSO₄～(2-)/Fe₂O₃-CoO ₃ and SO₄～(2-)/Fe₂O₃-CoO₃ catalyst in bedreactor. The methods of the two catalystswere prepared, and the catalysts were characterized by FT-IR, SEM and XPS spectra, and theproducts were analyzed by GC/MS. The aromatization of n-hexane is the dominant route foryielding p-xylene and methylbenzene, with selectivities of 62.6% and 23.9%, respectively, when theinformance of SO₄～(2-)/Fe₂O₃-CoO₃ At the informance of SO₄～(2-)/Fe₂O₃-CoO₃,the aromatization ofn-hexane is the dominant route for yielding indene and naphthalin, with selectivities of 54.3% and34.2%, respectively. The mechanism of reaction was concluded.