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Oxidative dehydrogenation of cyclohexane and cyclohexene over supported gold, palladium and gold-palladium catalysts

Dummer, Nicholas, Bawaked, Salem Mohammed, Hayward, James, Jenkins, Robert Leyshon and Hutchings, Graham John 2010. Oxidative dehydrogenation of cyclohexane and cyclohexene over supported gold, palladium and gold-palladium catalysts. Catalysis Today 154 (1-2) , pp. 2-6. 10.1016/j.cattod.2010.03.031

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Abstract

Supported gold, palladium and gold–palladium catalysts have been used to oxidatively dehydrogenate cyclohexane and cyclohexenes to their aromatic counterpart. The supported metal nanoparticles decreased the activation temperature of the dehydrogenation reaction. We found that the order of reactivity was Pd ≥ Au–Pd > Au supported on TiO2. Attempts were made to lower the reaction temperature whilst retaining high selectivity. The space-time yield of benzene from cyclohexane at 473 K was determined to be 53.7 mol/kgcat/h rising to 87.3 mol/kgcat/h at 673 K for the Pd catalyst. Increasing the temperature in this case improved conversion at a detriment to the benzene selectivity. Oxidative dehydrogenation of cyclohexene over AuPd/TiO2 or Pd/TiO2 catalysts was found to be very effective (conversion >99% at 423 K). These results indicate that the first step in the reaction sequence of cyclohexane to cyclohexene is the slowest step. These initial results suggest that in a fixed-bed reactor the oxidative dehydrogenation in the presence of oxygen, palladium and gold–palladium catalysts are readily able to surpass current literature examples and with further modification should yield even higher performance.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Subjects: Q Science > QD Chemistry
Uncontrolled Keywords: Transition metal; Ethylenic compound; Modification;Oxygen; Fixed bed reactor; Conversion; Benzene; Selectivity; Binary compound; Titanium oxide; Transition element compounds;Activation; Surface physicochemistry;Nanoparticle; Catalytic reaction; Heterogeneous catalysis; Catalyst; Platinoid; Palladium; Gold; Support; Cyclohexane; Dehydrogenation ; Oxidation ;
Publisher: Elsevier
ISSN: 0920-5861
Last Modified: 02 Feb 2018 23:23
URI: http://orca.cf.ac.uk/id/eprint/6827

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