Effect of phosphorus on activity of hydrotreating catalyst of Maya heavy crude
Effect of phosphorus on activity of hydrotreating catalyst of Maya heavy crude
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DOI：
10.1016/j.cattod.2005.08.010
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发表时间：
2005-11
期刊：
影响因子：
5.3
通讯作者：
S. K. Maity;J. Ancheyta;M. Rana;P. Rayo
中科院分区：
文献类型：
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作者：
S. K. Maity;J. Ancheyta;M. Rana;P. Rayo
考察了磷对催化剂物理性能和玛雅原油加氢处理活性的影响。采用共浸渍法制备了催化剂。氧化铝-二氧化钛二元氧化物用作载体材料。催化剂中磷的存在降低了微孔的百分比，并且它导致比表面积的降低。程序升温还原（TPR）表明，磷酸盐减少金属载体的相互作用。它导致形成的多面体相的强结合的四面体的双金属化合物的费用。在较高的P负载，聚碳酸酯可能存在准晶体MoO 3。然而，TPR实验的灵敏度不足以区分作者所用的催化剂上存在的几个相。观察到HDM活性略有增加，但与不含P的催化剂相比，含P的催化剂中的HDS活性较低。失活催化剂物理性质的变化主要是由于催化剂上的积炭。加氢处理催化剂上磷的存在抑制加氢处理反应期间焦炭的形成。
The effect of phosphorus on physical properties of the catalyst and on activity of hydrotreating of Maya crude was studied in this work. Catalysts were prepared by the co-impregnation method. Alumina-titania binary oxide was used as a support material. The presence of phosphorus in the catalyst decreases the percentage of micropores, and it results in a decrease of specific surface area. Temperature program reduction (TPR) shows that phosphates reduce metal support interaction. It leads to the formation of polymolybdate phases in expense of strongly bonded tetrahedral molybdates. At higher P loading, polymolybdates may be present with quasi crystalline MoO3. However, the TPR experiment is not sufficiently sensitive to distinguish several phases present on the catalysts used by the authors. A slight increment of HDM activity is observed, but HDS activity is lower in the P containing catalyst compared with the P free catalyst. The changes of physical properties of the spent catalysts are mainly due to the coke formation on the catalyst. The presence of phosphorus on hydrotreating catalysts inhibits coke formation during the hydrotreating reaction.