Production of Middle Distillate Through Hydrocracking of Paraffin Wax over NiMo/SiO₂鈥揂l₂O₃ Catalysts: Effect of SiO₂鈥揂l₂O₃ Composition on Acid Property and Catalytic Performance of NiM

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• 作者：Sunhwan Hwang ; Joohyung Lee ; Sunyoung Park ; Dong Ryul Park ; Ji Chul Jung ; Sang-Bong Lee and In Kyu Song
• 关键词：Hydrocracking ; Paraffin wax ; NiMo/SiO2– ; Al2O3 ; Middle distillate
• 刊名：Catalysis Letters
• 出版时间：April, 2009
• 出版年：2009
• 期刊代码：13_1011372X
• 类别：ch
• 卷：129
• 期：1-2
• 页码：163-169
• 数据来源：sp

摘要

SiO₂–Al₂O₃ supports with different composition were prepared by a precipitation method in order to control the acid property of SiO₂–Al₂O₃ supports. NiMo/SiO₂–Al₂O₃ catalysts were then prepared by an impregnation method and sulfided for use in the production of middle distillate through hydrocracking of paraffin wax. It was revealed that MoS₂ phase was dominantly formed in the NiMo/SiO₂–Al₂O₃ catalysts, while Ni–Mo–S phase was not detected due to its fine dispersion. Acidity of NiMo/SiO₂–Al₂O₃ catalysts measured by NH₃–TPD experiments showed a volcano-shaped curve with respect to SiO₂ content. Acidity of the catalysts played an important role in determining the catalytic performance in the hydrocracking of paraffin wax. Conversion of paraffin wax was monotonically increased with increasing acidity of the catalyst, while yield for middle distillate showed a volcano-shaped curve with respect to acidity of the catalyst. Thus, optimal acidity of NiMo/SiO₂–Al₂O₃ catalysts was required for the maximum production of middle distillate through hydrocracking of paraffin wax.