title: Effect of cobalt precursors on the dispersion, reduction, and CO oxidation of CoO(x)/γ-Al2O3 catalysts calcined in N2.
abstract: The present work tentatively investigated the effect of cobalt precursors (cobalt acetate and cobalt nitrate) on the physicochemical properties of CoO(x)/γ-Al(2)O(3) catalysts calcined in N(2). XRD, Raman, XPS, FTIR, and UV-vis DRS results suggested that CoO/γ-Al(2)O(3) was obtained from cobalt acetate precursors and CoO was dispersed on γ-Al(2)O(3) below its dispersion capacity of 1.50 mmol/(100 m(2) γ-Al(2)O(3)), whereas Co(3)O(4)/γ-Al(2)O(3) was obtained from cobalt nitrate precursors and Co(3)O(4) preferred to agglomerate above the dispersion capacity of 0.15 mmol/(100m(2) γ-Al(2)O(3)). Compared with Co(3)O(4)/γ-Al(2)O(3), CoO/γ-Al(2)O(3) catalysts were difficult to be reduced and easy to desorb oxygen species at low temperatures and presented high activities for CO oxidation as proved by H(2)-TPR, O(2)-TPD, and CO oxidation model reaction results. A surface incorporation model was proposed to explain the dispersion and reduction properties of CoO/γ-Al(2)O(3) catalysts.
authors.affiliation: Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, People's Republic of China.
authors.forename: Lingling
authors.initials: L
authors.lastname: Zhang
authors.forename: Lihui
authors.initials: L
authors.lastname: Dong
authors.forename: Wujiang
authors.initials: W
authors.lastname: Yu
authors.forename: Lianjun
authors.initials: L
authors.lastname: Liu
authors.forename: Yu
authors.initials: Y
authors.lastname: Deng
authors.forename: Bin
authors.initials: B
authors.lastname: Liu
authors.forename: Haiqin
authors.initials: H
authors.lastname: Wan
authors.forename: Fei
authors.initials: F
authors.lastname: Gao
authors.forename: Keqin
authors.initials: K
authors.lastname: Sun
authors.forename: Lin
authors.initials: L
authors.lastname: Dong