Upgrading of Lignin-Derived Bio-oil Components Catalyzed by Pt/纬-Al2O3: Kinetics and Reaction Pathways Characterizing Conversion of Cyclohexanone with H2
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- 作者：Majid Saidi ; Parisa Rostami ; Mohammad Reza Rahimpour ; Bruce C. Gates ; Sona Raeissi
- 刊名：Energy & Fuels
- 出版年：2015
- 出版时间：January 15, 2015
- 年：2015
- 卷：29
- 期：1
- 页码：191-199
- 全文大小：444K
- ISSN：1520-5029
文摘
The conversion of cyclohexanone catalyzed by Pt/纬-Al2O3 in the presence of H2 was investigated with a fixed-bed tubular flow reactor at temperatures in the range of 573鈥?73 K, a pressure of 14 bar, and space velocities in the range of 3鈥?20 g of cyclohexanone/(g of catalyst 脳 h). Data determined at low conversions of cyclohexanone identify the kinetically significant reaction classes (hydrogenation, dehydrogenation, hydrodeoxygenation, dehydration, and condensation) and quantitatively represent the initial product distribution. The pseudo-first-order rate constants for formation of the main products of cyclohexanone conversion under initial reaction conditions decrease in the following order: phenol > 2-cyclohexylidenecyclohexan-1-one > 2-methylphenol > cyclohexylbenzene > cyclohexane > biphenyl > 2-cyclohexen-1-one > 2-cyclohexylcyclohexan-1-one > 2-phenylphenol > cyclohexene > 2-cyclohexylphenol. The apparent activation energy for the dehydrogenation reaction that leads to phenol formation is approximately 17 kJ/mol; condensation is the reaction class characterized by the highest apparent activation energy.