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- W134889496 abstract "The use of crystallographic data in formulating models useful in the improvement of MoO3/Al2O3, catalysts promoted by Co and Ni is illustrated. The activated forms of existing catalysts were modeled with CoMo2S4 starting in 1974. This led to the prediction that MoO3 loadings higher than those in use at that time should be possible with constructive results. The model was found to be valid in tests of catalysts with various metals loadings for initial resid desulfurization activity, and in more extended testing for the desulfurization of light diesel. A separate program started later led to the development and eventual commercialization in 1982 of what are now among the world's most active denitrogenation catalysts. A review of the current status of fundamental research in the area of Mo-based hydrotreating catalysts reveals lingering uncertainty over the exact identity of the active sites. The most favored picture at present is a monolayer distribution of microcrystalline MoS2 over the surface of the Al2O3, support, with the promoter atoms (Ni or Co)2 in surface positions in a bonding configuration similar to that of Co in CoMo2S4. Futuristic predictions with models based on (a) NiMo3S4, and (b) MoS2 in monolayer dispersion on Al2O3 surfaces poses a dilemma. If (a) is correct, there is still substantial incentive for improvement of even the best hydrotreating catalysts. If (b) is correct, we have probably reached the limit, at least as far as the benefit of metals loading is concerned. Better resolution of the exact nature of the surface species in these catalysts would indicate whether we should continue trying to improve the present systems, or develop new ones." @default.
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- W134889496 date "1989-01-01" @default.
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- W134889496 title "A History of the Development of High-Metals Hydrotreating Catalysts. The Use of Crystallographic Concepts in Catalyst Design" @default.
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- W134889496 doi "https://doi.org/10.1016/s0167-2991(08)60495-4" @default.
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