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• W2025827666 abstract "The effect of catalyst sulphidation on hydrodeoxygenation was studied under pseudo-steady-state conditions in a continuous trickle-bed reactor at 523 K. Sulphur was added to the feed in the form of carbon disulphide. The catalyst used was a commercial CoO-MoO3/γ-Al2O3 hydrotreating catalyst which was presulphided at 523 or 623 K. Experiments were made both with a high and a low oxygen content of the feed by using o-methoxyphenol (guaiacol) as a model compound at different concentrations, and also with addition of other oxygen-containing compounds. The conversion of guaiacol increased with increasing sulphur content of the feed. The selectivity of the hydrodeoxygenation had its highest value, however, when a presulphided catalyst was used without sulphur added to the feed. This indicates that oxygen and sulphur compete for the same hydrogenolytically active sites. The effect on the selectivity of the formation of specific products varied with the sulphur content. This is at least partly due to steric effects. The proportion of both the O- and ring alkylation decreased with increasing sulphur content. The selectivity of phenol formation increased significantly even at the lowest level of sulphur addition, whereas the selectivity of veratrole formation decreased only gradually. In the competing hydrodeoxygenation systems, diphenyl ether did not have any effect, whereas isopropanol decreased the conversion of quaiacol. The sulphur content of the catalyst, measured after reaction, did not increase with increasing sulphur content of the feed but remained at a relatively low level. This was about 2 wt.-% for high and 3 wt.-% for low oxygen-content feeds. Presulphidation tests showed that a significantly higher sulphur-content of the catalyst could easily be achieved. This gives additional proof of competition between oxygen and sulphur atoms for the same active sites on the catalyst." @default.
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• W2025827666 date "1989-01-01" @default.
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• W2025827666 title "Influence of sulphur level on hydrodeoxygenation" @default.
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• W2025827666 doi "https://doi.org/10.1016/s0166-9834(00)83371-0" @default.
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