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- W108304966 abstract "We analyzed the metallopetroporphyrins and the metallo-nonporphyrins during thermal and catalytic upgrading of heavy residua. Both types of processing remove metals. By size exclusion chromatography with element specific detection (SEC-ICP), we found thermal treatment reduces the size of the remaining metal-containing compounds, while for certain catalysts, fixed-bed treatment preferentially removes the metal-containing molecules in the size range of the catalyst pore. In both processes, the metallopetroporphyrins are easily removed. UV-vis spectroscopic analysis of chromatographic fractions of products where V petroporphyrin removal is not complete indicates the presence of intermediates in the demetalation sequence for vanadyl petroporphyrins. Spectral properties of these potential intermediates are consistent with a pathway of initial porphyrin reduction to chlorins, then further reduction. The presence of chlorins as intermediates is in agreement with previously published work using metalloporphyrin model compounds. This work shows similar demetalation behavior of the V petroporphyrins in actual feeds under commercial processing conditions." @default.
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- W108304966 date "1987-07-06" @default.
- W108304966 modified "2023-10-10" @default.
- W108304966 title "Reaction Sequence of Metallopetroporphyrins During Heavy Residuum Upgrading" @default.
- W108304966 doi "https://doi.org/10.1021/bk-1987-0344.ch013" @default.
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