✍ Scribed by Jenny M. Jones; Ronald A. Kydd; P.Michael Boorman; Phyllis H. van Rhyn
No coin nor oath required. For personal study only.
Ni Mo/A1203 catalysts containing two promoters, fluoride and phosphorus, were studied to learn whether the benefits of both promoters could be combined to produce a superior catalyst. Initially, two series of catalysts differing in the sequence of impregnation of the additives were prepared and tested in the hydrocracking of cumene and the hydrodesulfurization of thiophene. Catalysts impregnated in the sequence phosphorus-metals (Ni and Mo)-fluoride were clearly superior to those prepared by adding first phosphorus, then fluoride and finally metals. The more effective series of catalysts was tested in the hydroprocessing of a gas oil feedstock; to determine the resistance of these surfaces to poisoning, tests were also carried out with the same feedstock spiked with quinoline. The bi-promoted catalysts retained fluoride well, and were quite effective in hydrogenation and hydrodesulfurization. They were even more effective than phoshorous-only promoted catalysts in quinoline hydrodenitrogenation.
📜 SIMILAR VOLUMES
A series of boron-modified commercial Ni-Mo/A1203 hydrotreating catalysts have been characterized by IR analysis of adsorbed NO and pyridine and by gas-oil sulfur-and nitrogen-removal activities. Sulfur removal activity was found to correlate with the 1690 cm -1 (Mo(NO)22÷) band in the NO adsorption
A series of co-impregnated (pH 1) P-Ni-W/AI20 3 catalysts of low tungsten content (1.6 W atoms/nm 2) and varying phosphorus concentration (0-5.9 wt.-% P205) have been studied in the reaction of hydrogenation of naphthalene in a batch Parr reactor at 573 K and P = 44 atm. In addition to a previous ch