Physicochemical and catalytic properties of sol gel-prepared copper-chromium oxides

Nadia Dupont , A. Kaddouri (1) , P. Gelin (1)

1 IRCELYON - Institut de recherches sur la catalyse et l'environnement de Lyon

Nanostructured copper-chromium oxides were prepared by the sol-gel process (SG) and were characterised by elemental analysis, thermal analysis (TG-DTA), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and by their activity in methane combustion. A comparative study was made with copper chromites commercial catalysts. The as-synthesised copper chromites sample exhibited higher specific surface area (248 m(2) g(-1)) with respect to commercial solids (42 m(2) g(-1)). The surface quantitative analysis evidenced a Cr6+ enrichment for the SG catalyst (Cr6+/Cr3+=0.56) with respect to commercial sample (0.39), while the ratio of copper species Cu2+/(CuA degrees A + Cu+) was the same in both solids. Catalytic activity of SG solids in methane combustion was found to be comparable to that of Pt/Al2O3 and superior to that of commercial copper chromites tested under the same conditions.

Domaines: Catalyse; Environnement et Société

Nadia Dupont, A. Kaddouri, P. Gelin. Physicochemical and catalytic properties of sol gel-prepared copper-chromium oxides. Journal of Sol-Gel Science and Technology, 2011, 58, pp.302-306. ⟨10.1007/s10971-010-2391-6⟩. ⟨hal-00602751⟩