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Hydrogenation of Anthracene in Supercritical Carbon Dioxide Solvent Using Ni Supported on Hβ-Zeolite Catalyst
U.S. Environmental Protection Agency, Office of Research & Development, National Risk Management Research Laboratory, 26 West, Martin Luther King Dr., Cincinnati, OH 45268, USA
* Author to whom correspondence should be addressed.
Received: 26 October 2011; in revised form: 20 December 2011 / Accepted: 11 January 2012 / Published: 30 January 2012
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.
Keywords: supercritical carbon dioxide; nickel/zeolite catalyst; anthracene; hydrogenation
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Sahle-Demessie, E.; Devulapelli, V.G.; Hassan, A.A. Hydrogenation of Anthracene in Supercritical Carbon Dioxide Solvent Using Ni Supported on Hβ-Zeolite Catalyst. Catalysts 2012, 2, 85-100.
Sahle-Demessie E, Devulapelli VG, Hassan AA. Hydrogenation of Anthracene in Supercritical Carbon Dioxide Solvent Using Ni Supported on Hβ-Zeolite Catalyst. Catalysts. 2012; 2(1):85-100.
Sahle-Demessie, Endalkachew; Devulapelli, Venu Gopal; Hassan, Ashraf Aly. 2012. "Hydrogenation of Anthracene in Supercritical Carbon Dioxide Solvent Using Ni Supported on Hβ-Zeolite Catalyst." Catalysts 2, no. 1: 85-100.