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- W4232180749 abstract "Three high-pressure flow microreactors and two batch autoclave reactors have been used to study the reaction networks and kinetics of: (1) catalytic hydrodesulfurization of dibenzothiophene and methyl-substituted dibenzothiophenes; and (2) catalytic hydrodenitrogenation of quinoline, methyl-substituted quinolines, acridine and carbazole. The catalysts were commercial, sulfided CoO-MoO/sub 3//..gamma..-Al/sub 2/O/sub 3/, NiO-MoO/sub 3//..gamma..-Al/sub 2/O/sub 3/, and NiO-WO/sub 3//..gamma..-Al/sub 2/O/sub 3/. At the typical conditions of 300/sup 0/C and 104 atm, dibenzothiophene reacts to give H/sub 2/S and biphenyl in high yield, but there is some hydrogenation preceding desulfurization. Methyl-substituted dibenzothiophenes react similarly, and each reaction is first-order in the sulfur-containing compound. Two methyl groups near the sulfur atom (in the 4 and 6 positions) reduce the reactivity tenfold, whereas methyl groups in positions further removed from the sulfur atom increase reactivity about twofold. The results are consistent with steric and inductive effects influencing adsorption. The data indicate competitive adsorption among the sulfur-containing compounds. In quinoline hydrodenitrogenation, both rings are saturated before the C-N bond is broken. Similarly, in acridine conversion a large amount of hydrogenation precedes nitrogen removal. Breaking of the carbon-nitrogen bond is evidently one of the slower reactions in the network. The Ni-Mo catalyst is about twice as active as the Co-Mo catalyst for ring hydrogenation, and the two catalysts are about equally active for breaking the carbon-nitrogen bond. Reactivity of carbazole is slightly lower than that of quinoline but higher than that of acridine." @default.
- W4232180749 created "2022-05-12" @default.
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- W4232180749 date "1978-01-20" @default.
- W4232180749 modified "2023-09-27" @default.
- W4232180749 title "Kinetics and mechanism of desulfurization and denitrogenation of coal-derived liquids. Tenth quarterly report, September 21-December 20, 1977" @default.
- W4232180749 doi "https://doi.org/10.2172/5957239" @default.
- W4232180749 hasPublicationYear "1978" @default.
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