Hydrogenation of anthracene in supercritical carbon dioxide solvent using Ni supported on Hβ-Zeolite catalyst

Endalkachew Sahle-Demessie, Venu Gopal Devulapelli, Ashraf Aly Hassan

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

Catalytic hydrogenation of anthracene was studied over Ni supported on Hβ-zeolite catalyst under supercritical carbon dioxide (sc-CO2) solvent. Hydrogenation of anthracene in sc-CO2 yielded 100% conversion at 100 °C, which is attributed to the reduced mass transfer limitations, and increased solubility of H2 and substrate in the reaction medium. The total pressure of 7 MPa was found to be optimum for high selectivity of octahydroanthracene (OHA). The conversion and selectivity for OHA increased with an increase in H2 partial pressure, which is attributed to higher concentration of hydrogen atoms at higher H2 pressures. The selectivity reduced the pressure below 7 MPa because of enhanced desorption of the tetrahydro-molecules and intermediates from Ni active sites, due to higher solubility of the surface species in sc-CO2. The selectivity of OHA increased with the increase in catalyst weight and reaction time. The rate of hydrogenation of anthracene was compared with that found for napthalene and phenanthrene. The use of acetonitrile as co-solvent or expanded liquid with CO2 decreased the catalytic activity.

Original languageEnglish
Pages (from-to)85-100
Number of pages16
JournalCatalysts
Volume2
Issue number1
DOIs
Publication statusPublished - Jan 30 2012
Externally publishedYes

Keywords

  • Anthracene
  • Hydrogenation
  • Nickel/zeolite catalyst
  • Supercritical carbon dioxide

ASJC Scopus subject areas

  • General Environmental Science
  • Catalysis
  • Physical and Theoretical Chemistry

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