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Effect of supercritical conditions upon catalyst deactivation in the hydrogenation of naphthalene

Chemical Engineering Journal, ISSN: 1385-8947, Vol: 207, Page: 133-141
2012
  • 12
    Citations
  • 0
    Usage
  • 12
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    12
    • Citation Indexes
      12
  • Captures
    12

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.

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