| Preparation of nanocrystalline γ-Al_2O_3 catalyst using different procedures for methanol dehydration to dimethyl ether |
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| 作者姓名： | Ahmad Reza Keshavarz Mehran Rezaei Fereydoon Yaripour |
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| 作者单位： | Ahmad Reza Keshavarz(Catalyst and Advanced Materials Research Laboratory,Chemical Engineering Department,Faculty of Engineering,University of Kashan,Kashan,Iran);Mehran Rezaei(Catalyst and Advanced Materials Research Laboratory,Chemical Engineering Department,Faculty of Engineering,University of Kashan,Kashan,Iran;Institute of Nanoscience and Nanotechnology,University of Kashan,Kashan,Iran);Fereydoon Yaripour(Catalyst Research Group,Petrochemical Research & Technology Company,National Petrochemical Company (NPC),P.O.Box 149650115,Tehran,Iran) |
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| 基金项目： | supported by the Petrochemical Research & Technology Company of National Petrochemical Company in Iran |
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| 摘 要： | A series of nanocrystalline γ-alumina are synthesized by different procedures, namely, thermal decomposition method (sample A), precipita-tion method (sample B) and sol-gel method using sucrose and hexadecyltrimethyl ammonium bromide (CTAB) as templates (samples C and D, respectively). Textural and acidic properties of γ-alumina samples are characterized by XRD, N2 adsorption-desorption and NH3-TPD techniques. Vapor-phase dehydration of methanol into dimethyl ether is carried out over these samples. Among them, sample C shows the highest catalytic activity. NH3-TPD analysis reveals that the sample with smaller crystallite size possesses higher concentration of medium acidic sites and consequently higher catalytic activity. Thermal decomposition method leads to decrease in both surface area and moderate acidity, therefore it is the cause of lower catalytic activity.
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| 关 键 词： | methanol dehydration dimethyl ether gama alumina sol-gel |
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