Hydrodesulfurization of 4,6-Dimethyldibenzothiophene over CoMo Catalysts Supported on 纬-Alumina with Different Morphology

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• 作者：Xuehui Li ; Yongming Chai ; Bin Liu ; Huan Liu ; Jingfeng Li ; Ruiyu Zhao ; Chenguang Liu
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：June 11, 2014
• 年：2014
• 卷：53
• 期：23
• 页码：9665-9673
• 全文大小：527K
• 年卷期：v.53,no.23(June 11, 2014)
• ISSN：1520-5045

文摘

Nanostructured 纬-alumina with two different morphologies (rod-like and cube-like) was used as support for CoMo hydrodesulfurization catalyst. Both 纬-aluminas were prepared by thermal decomposition of ammonium aluminum carbonate hydroxide precursor, which was synthesized by a convenient hydrothermal method at two pH values. Fourier transform infrared spectroscopy of prydine adsorption, thermogravimetric analysis, and ²⁷Al magic angle spinning (MAS) NMR showed that the rod-like 纬-alumina exhibited a lower acidity than the cube-like 纬-alumina. The result of X-ray diffraction and temperature-programmed reduction indicated that CoMo oxidic catalysts supported on the rod-like 纬-alumina presented higher reducibility compared to those of cube-like 纬-alumina, because more 尾-CoMoO₄ was formed on the surface of the rod-like 纬-alumina than that of the cube-like 纬-alumina. After sulfidation, a large stack with slightly longer MoS₂ slabs was formed on the rod-like 纬-alumina supports, thereby creating a catalyst with higher hydrodesulfurization activity and hydrogenation selectivity. The morphology of 纬-alumina has an influence on the activity and selectivity of the as-synthesized CoMo catalyst.