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• W2054332039 abstract "Abstract Kerogen represents the main form of the trapped organic matter (85 wt.%) in the Youssoufia rock phosphate. It is highly aliphatic in nature and contains a substantial amount of oxygen. Its direct pyrolysis leads to a small amount of pyrolysate (0.4 wt.%) and large quantities of gases. Carbon-dioxide evolution proceeded in two waves centered on 300 and 420 °C, attributed to the cleavage of carboxylic and ester functions. Hydrogen production gives rise to a broad peak covering a wide temperature range (400 to 800 °C). The methane evolves in a single peak extending from 300 to 650 °C. It results from the conventional combination of H ⋅ and (CH 3 ) ⋅ radicals. The evolution profiles of all the gases are similar to that observed when retorting directly the rock phosphate. Kerogen structure was also investigated by spectroscopic techniques and preparative pyrolysis in presence of tetramethyl ammonium hydroxide (thermochemolysis). The n -alkene/ n -alkane doublets indicate the occurrence of cross-linked aliphatic chains, partly originating from preserved, resistant biopolyesters. Ester and probably ether groups are involved in the cross-linking of the matrix. Esterified C 14 –C 28 fatty acids, cholestanol and 24-ethyl cholesterol are monosubstituents of the kerogen matrix. C 29 –C 32 α,β hopanes indicate that the kerogen is at the diagenesis evolution stage." @default.
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• W2054332039 date "2002-06-01" @default.
• W2054332039 modified "2023-10-18" @default.
• W2054332039 title "Pyrolysis and characterization of the kerogen from the Moroccan Youssoufia rock phosphate" @default.
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• W2054332039 doi "https://doi.org/10.1016/s0009-2541(02)00002-5" @default.
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