Effect of supercritical conditions upon catalyst deactivation in the hydrogenation of naphthalene
Chemical Engineering Journal, ISSN: 1385-8947, Vol: 207, Page: 133-141
2012
- 12Citations
- 12Captures
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Article Description
The hydrogenation of naphthalene in cyclohexane solvent was studied over a NiMo/Al 2 O 3 catalyst operated in a fixed bed reactor. The effect of operating under sub- and supercritical conditions was investigated at temperatures 250–300 °C and pressures 20–90 bar. Naphthalene/cyclohexene flows of 0.5–2.5 mL min −1 and hydrogen flows of 2–10 mL min −1 were investigated. When operating in the supercritical region with high hydrogen/liquid feed ratio, no significant deactivation occurred over 6 h of operation. A strong effect of pressure upon conversion was observed, with naphthalene conversion close to 100% at 60 bar, 300 °C. Trans-decalin was the favoured product over most of the range of conditions investigated. When operating at low hydrogen/liquid feed ratio, initial conversion of naphthalene was 90–95%, declining to 58% at supercritical conditions and 35% at subcritical conditions after 7 h. Coke deposition was 38% lower at supercritical conditions. The ability of supercritical fluids to delay catalyst deactivation is considered, together with interesting changes to product distribution that occur under these conditions.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S1385894712007425; http://dx.doi.org/10.1016/j.cej.2012.06.031; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84866876043&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S1385894712007425; https://dx.doi.org/10.1016/j.cej.2012.06.031
Elsevier BV
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