Effect of preparation methods and content of phosphorus on hydrotreating activity
Effect of preparation methods and content of phosphorus on hydrotreating activity
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DOI：
10.1016/j.cattod.2007.10.100
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发表时间：
2008-01
期刊：
影响因子：
5.3
通讯作者：
S. K. Maity;G. A. Flores;J. Ancheyta;M. Rana
中科院分区：
文献类型：
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作者：
S. K. Maity;G. A. Flores;J. Ancheyta;M. Rana
本次调查研究了磷含量和制备方法的影响。采用三种不同的方法来制备催化剂。该催化剂通过孔径分布、X射线衍射图和程序升温还原进行表征。进行噻吩加氢脱硫 (HDS)、异丙苯加氢裂化 (HC)、瓦斯油 HDS 和玛雅重质原油 HDS 以及加氢脱金属 (HDM) 活动。研究发现，随着磷的添加量，比表面积逐渐减小。磷的添加增加了对加氢处理反应更活跃的多钼酸盐物质的形成。还观察到这些物质的还原性也随着磷负载量的增加而增加。然而，在较高的 P 负载量下，会形成结晶 MoO3，但会牺牲这些多层聚合钼酸盐。共浸渍法制备的催化剂活性增加较多。当磷含量达到 1wt% 时，活性随着磷负载量的增加而增加。在较高的负载下，活性降低。还值得注意的是，P 抑制重质原油加氢处理过程中催化剂上焦炭的形成。磷还可以改变催化剂的布朗斯台德酸度，因此异丙苯加氢裂化活性略有增加。
The effect of phosphorus content and preparation methods is studied in this present investigation. Three different methods are employed for preparation of catalysts. The catalysts are characterized by pore size distribution, X-ray diffractogram and temperature programmed reduction. Thiophene hydrodesulfurization (HDS), cumene hydrocracking (HC), gas oil HDS and Maya heavy crude HDS and hydrodemetallization (HDM) activities are performed. It is found that specific surface area gradually decreases with P loading. The addition of phosphorus increases the formation of polymolybdate species which are more active for hydrotreating reaction. It is also observed that reducibility of these species also increases with P loading. However, at higher P loading the crystalline MoO3is formed at the expense of these multilayer polymeric molybdates. The increment in the activity is more in the catalyst prepared by co-impregnation method. The activity increases with P loading up to 1wt% P content. At higher loading the activity decreases. It is also noted that P inhibits coke formation on the catalyst during hydrotreating of heavy crude oil. Phosphorus can also modify the Brønsted acidity of the catalyst and hence cumene hydrocracking activity slightly increases.