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Title: A study of the structural characterization and cyclohexanol dehydrogenation activity of Cu/γ-Al2O3 catalysts@
Authors: Rachel, Anita
Kumari, V Durga
Subramanian, R
Chary, K V R
Rao, P Kanta
Issue Date: Jun-2004
Publisher: NISCAIR-CSIR, India
IPC Code: B01J 21/04; C07B 35/04
Abstract: A series of Cu/γ-Al2O3 catalysts has been prepared by wet impregnation of γ-  Al2O3 with aqueous cupric nitrate solution varying the copper content from 0.4 to 18.7 wt% followed by calcination at 400oC in air. These catalysts have been characterized by BET surface area, CO chemisorption, XRD, SEM, TPR and ESR. The TPR profiles show the presence of unreducible copper species at low loadings and reducible amorphous and bulk copper species at higher loadings. The ESR spectra of the unreduced and reduced Cu/γ-Al2O3 catalysts clearly distinguish the Cu (II) ions in their clustered and isolated forms, giving an indication of the existence of an interaction between CuO and γ-Al2O3 and also a definite change in the geometry depending on the Cu content. Catalytic activity of these catalysts has been studied for the dehydrogenation of cyclohexanol over unreduced and reduced catalysts at 200-300oC. Structure- activity relationships of the catalysts are discussed. X-ray diffraction pattern of the catalyst containing 10.2 wt% Cu after reaction shows the presence of α-Cu confirming the oxidative dehydrogenation of cyclohexanol on unreduced catalysts.
Page(s): 1172-1180
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.43A(06) [June 2004]

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