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- W2071269546 abstract "The transformation of quinoline 1,2,3,4-tetrahydroquinoline, orthopropylaniline and 3-phenylpropylamine in the presence of a presulfided NiMo-Al203 catalyst (batch reactor, 340°, 170 atm.) shows that denitrogenation per se (i.e. C-N bond cleavage leading to nitrogen elimination) follows hydrogenation ; thus quinoline or 1,2,3,4-tetrahydroquinoline decomposition probably involves a double Hofmann type degradation of the intermediate decahydroquinoline.1,2,3,4-Tetrahydroquinoline transformation was chosen as a means of evaluating the denitrogenation/hydrogenation selectivity of the catalyst. The orthopropyl-aniline formation rate which involves a C-N bond cleavage is considered to represent the denitrogenation activity whereas the decahydroquinoline formation rate represents that of hydrogenation. We found that the presence in the feed of a hydrogen sulfide precursor favours denitrogenation ; however our results show clearly that the improvement of the denitrogenation/hydrogenation selectivity is also due to the inhibition of hydrogenation. The results obtained in a dynamic flow reactor (350°, 30 atm.) confirm this effect and show it is a reversible one. To explain this phenomenon it is supposed that denitrogenation is catalysed by hydrogen sulfide adsorbed on hydrogenating sites namely sulfide anion vacancies." @default.
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- W2071269546 date "1985-01-01" @default.
- W2071269546 modified "2023-09-27" @default.
- W2071269546 title "Selectivity of hydrodenitrogenation catalysts" @default.
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- W2071269546 doi "https://doi.org/10.1016/s0166-9834(00)81155-0" @default.
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