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- W3035894115 abstract "Vanadium, which is present in crude oil as metal porphyrins, builds up on cracking catalyst during use and is believed to cause decomposition of the faujasite component. The addition of magnesia (MgO) to cracking catalyst is thought to passivate the vanadium thereby prolonging catalyst life. An analytical electron microscope (AEM) investigation was undertaken to gain an understanding of the passivation mechanism. The base catalyst used in this study was composed of faujasite and an amorphous silica-alumina. Test samples were prepared by mixing steamed cracking catalyst with MgO, impregnating the mixture with vanadium and nickel naphthenates, drying at 250°F, calcining at 1000°F, and steaming at 1400°F. The two samples used for the AEM study each had final compositions of 1000 ppm Ni and 3000 ppm V, but contained levels of 30 and 3% MgO." @default.
- W3035894115 created "2020-06-25" @default.
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- W3035894115 date "1987-08-01" @default.
- W3035894115 modified "2023-10-17" @default.
- W3035894115 title "MgO Passivation of Vanadium on Cracking Catalyst" @default.
- W3035894115 cites W2037176341 @default.
- W3035894115 doi "https://doi.org/10.1017/s0424820100125907" @default.
- W3035894115 hasPublicationYear "1987" @default.
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