Production of Middle Distillate Through Hydrocracking of Paraffin Wax Over NiMo/SiO₂-Al₂O₃ Catalysts: Effect of Solvent in the Preparation of SiO₂-Al₂O₃ by a Sol鈥揋el Method

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• 作者：Sunhwan Hwang ; Joongwon Lee ; Jeong Gil Seo ; Dong Ryul Park ; Min Hye Youn ; Ji Chul Jung ; Sang-Bong Lee and In Kyu Song
• 关键词：Hydrocracking ; Paraffin wax ; NiMo/SiO2 ; Al2O3 ; Middle distillate ; Sol– ; gel method
• 刊名：Catalysis Letters
• 出版时间：October, 2009
• 出版年：2009
• 期刊代码：13_1011372X
• 类别：ch
• 卷：132
• 期：3-4
• 页码：410-416
• 数据来源：sp

摘要

SiO₂-Al₂O₃ supports were prepared by a sol–gel method in the presence of distilled water and ethanol, respectively (SiO₂-Al₂O₃ supports were donated as H-SA and E-SA, respectively). NiMo/SiO₂-Al₂O₃ catalysts (NiMo/H-SA and NiMo/E-SA) were then prepared by an impregnation method for use in the production of middle distillate (C₁₀–C₂₀) through hydrocracking of paraffin wax. The effect of solvent in the preparation of SiO₂-Al₂O₃ support on the catalytic performance of NiMo/SiO₂-Al₂O₃ catalyst was investigated. NiMo/H-SA catalyst showed a higher conversion of wax and a higher selectivity for middle distillate than NiMo/E-SA catalyst. The identity of solvent strongly affected the physical properties of H-SA and E-SA supports. High surface area of H-SA enhanced the dispersion of impregnated metal species, resulting in the increase of active sites of NiMo/H-SA catalyst. Large pore volume and large pore diameter of NiMo/H-SA catalyst played an important role in enhancing internal mass transfer during the reaction. Large acidity of NiMo/H-SA catalyst compared to NiMo/E-SA catalyst was responsible for high conversion of wax over NiMo/H-SA catalyst. The enhanced selectivity for middle distillate over NiMo/H-SA catalyst was attributed to abundant active sites for hydrogenation reaction.