Chen Chun-Liang, Lin Shiow-Shyung, Liu Tuan-Chi
Department of Chemical Engineering, Southern Taiwan University of Technology, Tainan, ROC.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2002;37(6):1147-57.
The purpose of this research was to study the effects of preparation conditions on the catalytic properties of the Co-Mo/gamma-Al2O3 catalyst. The work included catalyst preparations and reactions. In the preparations, cobalt-impregnated Mo/gamma-Al2O3 (designated as IcIM) was found to have a promoting effect on the hydrodesulfurization (HDS) of thiophene. Activity and stability of IcIM was higher than that of Mo/gamma-Al2O3. Conversely, when cobalt was added onto Mo/gamma-Al2O3 by the mechanical mixing method, no promoting effect was observed. Mo/gamma-Al2O3 was also prepared using the two different methods (incipient impregnation or mechanical mixing). The differently prepared Mo/gamma-Al203 resulted in no obvious difference in activity of IcIM. It was further found that Co-Mo/gamma-Al2O3 activity initially increased appreciably with Mo content and leveled off at Mo contents above 9 wt.%. The catalyst exhibited a maximum activity at Co/Mo ratio 0.3. The order in which metal species were added had a great influence on the activity of the Co-Mo/gamma-Al2O3 catalyst. Higher activity was obtained when Co was added into Mo/gamma-Al2O3 as opposed to Mo added into Co/gamma-Al2O3.
本研究的目的是研究制备条件对Co-Mo/γ-Al2O3催化剂催化性能的影响。这项工作包括催化剂的制备和反应。在制备过程中，发现钴浸渍的Mo/γ-Al2O3（称为IcIM）对噻吩的加氢脱硫（HDS）有促进作用。IcIM的活性和稳定性高于Mo/γ-Al2O3。相反，当通过机械混合法将钴添加到Mo/γ-Al2O3上时，未观察到促进作用。Mo/γ-Al2O3也采用两种不同的方法（初湿浸渍或机械混合）制备。不同方法制备的Mo/γ-Al2O3对IcIM的活性没有明显差异。进一步发现，Co-Mo/γ-Al2O3的活性最初随着Mo含量的增加而显著增加，并在Mo含量高于9 wt.%时趋于稳定。该催化剂在Co/Mo比为0.3时表现出最大活性。金属物种的添加顺序对Co-Mo/γ-Al2O3催化剂的活性有很大影响。与将Mo添加到Co/γ-Al2O3中相比，将Co添加到Mo/γ-Al2O3中可获得更高的活性。
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