Production of Middle Distillate Through Hydrocracking of Paraffin Wax over NiMo/SiO₂-Al₂O₃ Catalysts: Effect of SiO₂-Al₂O₃ Composition on Acid Property and Catalytic Performance of NiMo/SiO₂-Al₂O₃ Catalysts

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 hydrocrackin...

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Bibliographic Details
Published in:Catalysis letters 2009-04, Vol.129 (1-2), p.163-169
Main Authors: Hwang, Sunhwan, Lee, Joohyung, Park, Sunyoung, Park, Dong Ryul, Jung, Ji Chul, Lee, Sang-Bong, Song, In Kyu
Format: Article
Language:English
Subjects:
Aluminum oxide
Ammonia
Catalysis
Catalysts
Catalytic converters
Chemical industry
Chemistry
Chemistry and Materials Science
Composition effects
Distillates
Exact sciences and technology
General and physical chemistry
Hydrocracking
Industrial Chemistry/Chemical Engineering
Molybdenum disulfide
Nickel
Organometallic Chemistry
Paraffin wax
Physical Chemistry
Silicon dioxide
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Volcanoes
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Summary: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.
ISSN:1011-372X
1572-879X
DOI:10.1007/s10562-008-9784-y