Influence of the preparation method on the hydrotreating activity of MoS₂/Al₂O₃ extrudates: A Raman microspectroscopy study on the genesis of the active phase

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• 作者：Jaap A. Bergwerff ; Marcel Jansen ; Bob (R.) G. Leliveld ; Tom Visser ; Krijn P. de Jong and Bert M. Weckhuysen
• 关键词：Hydrodesulfurization ; Raman spectroscopy ; Microspectroscopy ; MO/Al₂O₃ ; Extrudates ; Catalyst preparation
• 刊名：Journal of Catalysis
• 出版年：2006
• 期刊代码：97_00219517
• 类别：ce
• 出版时间：25 October 2006
• 卷：243
• 期：2
• 页码：292-302
• 文件大小：492 K

摘要

Raman microspectroscopy was used to study the preparation of industrial MoS₂/Al₂O₃ extrudates. Using this technique, the influence of the impregnation solution composition on the nature and macrodistribution of Mo complexes inside these catalyst bodies was evaluated during their preparation process (impregnation, drying, and calcination). It was found that poor dispersion of the MoO_x phase in the calcined samples can be brought about by the formation of bulk (NH₄)₃[Al(OH)₆Mo₆O₁₈] during impregnation or redistribution of Mo complexes during drying. The formation of crystalline MoO₃ and Al₂(MoO₄)₃ in the oxidic precursors leads to a poorly dispersed MoS₂ phase in the final catalyst and significantly lower hydrodesulfurization activity. The spatially resolved information that can be obtained, and its inherent sensitivity for the detection of crystalline phases make Raman microspectroscopy a powerful characterization technique for studying the preparation of industrial supported metal oxide catalysts.