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- W4249901174 abstract "Publisher SummaryThis chapter introduces to a book that discusses hydroprocessing of heavy feeds. The hydroprocessing of heavy feeds differs markedly from that of light feeds. This results from the presence of high molecular weight asphaltenic molecules and resins, as well as that of the organometallic compounds in heavy feeds. In some heavy feeds, a clay-like mineral matter and water-soluble salts in the form of finely dispersed emulsions can also be present. In designing the suitable catalysts for hydroprocessing of heavy feeds, special attention has to be paid to the surface properties of catalysts such as pore size and pore volume distribution. These parameters have to be selected to ensure that the optimal combination of porosity and active surface area is achieved. The optimal parameters are feed dependent, suggesting that a combination of the surface properties giving the best performance for a particular feed may change once the feed is changed. An active catalyst for hydroprocessing of heavy feeds has to be resistant to deactivation by coke and metal deposits. In the case of the latter, the catalyst has to possess a desirable metal storage capacity. Poisoning of the catalyst by N-bases observed during the hydroprocessing of light feeds occurs during that of heavy feeds also although to a much lesser extent. However, the poisoning by N-compounds increases in the course of hydroprocessing." @default.
- W4249901174 created "2022-05-12" @default.
- W4249901174 date "2007-01-01" @default.
- W4249901174 modified "2023-09-26" @default.
- W4249901174 title "Chapter 1 Introduction" @default.
- W4249901174 doi "https://doi.org/10.1016/s0167-2991(07)80222-9" @default.
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