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Boron effects in a zeolite-based hydrotreating catalyst

Journal Article · · J. Catal.; (United States)
A hydrotreating catalyst has been prepared by incorporating HY zeolite (50 wt%) into an Al/sub 2/O/sub 3/ matrix by a forming method involving peptizing agents, mix-mulling, and a high-temperature calcination step prior to metals loading with 14% Mo and 4% Ni. Electronic microprobe measurements indicate that boron (H/sub 3/BO/sub 3/) addition generates a catalyst with radial concentration gradients; its exterior is metal-rich in molybdenum and nickel. In contrast, if Al(NO/sub 3/)/sub 3/ is used as a peptizing agent, metals (Ni and Mo) are preferentially found in the catalyst interior. X-Ray photoelectron spectroscopy (XPS) indicates that nickel is present as a pseudo-spinel, while molybdenum is present predominantly as a supported oxide. Macroporosity as well as segregation of metals on the surface (induced by H/sub 3/BO/sub 3/ addition) is believed responsible for the boron-containing catalyst's improved hydrodenitrogenation activity in upgrading vacuum gas oil at mild hydrotreating conditions.
Research Organization:
Gulf Research and Development Co., Pittsburgh, PA (USA)
OSTI ID:
5269283
Journal Information:
J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 97:2; ISSN JCTLA
Country of Publication:
United States
Language:
English