From this study we can extract the following remarks:

• In the oxidized state, the studied Cu-ZrO2 system is formed of a hydroxylated solid solution of copper and zirconia and a variable amount of free CuO.

• In a partially reduced state, the solid solution is maintained until 250°C. Beyond this temperature, copper diffuses to the surface and a complete demixing of the solid solution is obtained between 550°C and 600°C with a clear crys-tallographic evolution of the ZrO2 phase to cubic or quadratic form. Besides, metallic copper appears less or more rapidly according to the composition and the dimension of the copper oxide grains.

• During the activation step of the catalysts in H2 (150°C or 250°C), Cu+ species inserted in the zirconia network and Cu0 are formed.

• The catalysts have been tested in isoprene and carbon dioxide hydrogenation reactions, in both cases solids showing the best activity are found to follow the decreasing order: (Cu/Zr1) > (Cu/Zr0.5)K > (Cu/Zr0.5) > (Cu/Zr2)> (Cu/Zr0). Moreover, (Cu/Zr0.5)K presents a good selectivity to methanol while (Cu/Zr1) is more selective toward methane.


Bali, F, Bettahar, MM, Wrobel, G, Bonnelle, JP (1995) Catalyseurs oxydes à base de cuivre et de zirconium. Caractérisation à l'état réduit et réactivité. Journal de Chimie Physique 92: 1405-1417.

Bali, F, Bettahar, MM, Wrobel, G, Bonnelle, JP (1996) Préparation de catalyseurs Cu-Zr-O et caractérisation à l'état oxyde. Colloque Acta on Catalysis 2: 57-63. Bartley, JJ, Burch, R (1988) Support and Morphological Effects in the Synthesis of Methanol over Cu/ZnO, Cu/ZrO2 and Cu/SiO2 Catalysts. Applied Catalysis 43: 141-153. Bechara, R, Aboukais, A, Hubaut, R, Wrobël, G, D'Huysser, A, Bonnelle, JP (1992) Hydrogenation on copper chromite catalysts. Role of cuprous ions in the methanol synthesis from the syngas. Journal de Chimie Physique 89: 853-866.

Gao, LZ, Li, JT, Au, CT (2000) Mechanistic studies of CO and CO2 hydrogenation to methanol over 50 Cu/45 Zn/Al catalysts by in-situ FT-IR chemical trapping and isotope labelling methods. Studies in Surface Science and Catalysis 130: 3711-3716. Gao, LZ, Goeppert, A, Surya, GK (2005) CO2 Hydrogenation to Methanol on a

YBa2Cu3O7 Catalyst. Chemistry International 44: 2636-2639.

Hubaut R, Daage M, Bonnelle JP (1986) Selective hydrogenation on copper chromite catalysts. IV. Hydrogenation for a,p unsaturated aldehydes and ketones. Applied Catalysis 22: 231-241.

Hubaut, R, Bonnelle, JP (1991) Reactions of unsaturated ethers on copper-chromium catalysts. Studies in Surface Science and Catalysis 59: 287-293.

Jalowiecki, L, Daage, M, Tchen, AH, Bonnelle, JP (1985) Selective hydrogenation of die-nes on copper chromite catalysts. I. catalytic role of occluded hydrogen species. Applied Catalysis 16: 1-14.

Jalowiecki, L, Wrobel, G, Daage, M, Bonnelle, JP (1987) Structure of catalytic sites on hydrogen-treated copper-containing spinel catalysts. Journal of Catalysis 107: 375-392. Jaowiecki-Duhamel, L (2006) Hydrogen storage and induced properties in metallic catalytic materials. International Journal Hydrogen Energy 31: 191-195. Katona, T, Molnar, A (1995) Amorphous alloy catalysis: VII activation and surface characterization of an amorphous Cu-Ti alloy catalyst precursor in the dehydrogenation of 2-propanol and comparison with Cu-Zr. Journal of Catalysis 153: 333-343.

Klier, K, Chatikavanij, V, Herman, RG, Simmons, GW (1982) Catalysis synthesis from CO/H2. Journal of Catalysis 74: 343-360.

Ryczkowski, J (2001) IR spectroscopy in catalysis. Catalysis Today 68: 263-381.

Sun, Y, Sermon, PA (1994) Evidence of a metal-support interaction in sol-gel derived Cu-

ZrO2 catalysts for CO hydrogenation. Catalysis Letter 29: 361-369.

Sene, A (1992) Formation et fonctionnement des sites actifs des catalyseurs d'hydrogenation Cu-Zn-O et Cu-Zn-Al-O. Thesis of University of Lille, France. Siegel, S (1973) Alkene hydrogenation and related reactions: A comparison of heterogenous with homogenous catalysts. Journal of Catalysis 30: 139-145.

Wang, YM, Li, YS, Wong, PC, Mitchell, KAR (1993) XPS studies of stability and reactivity of thin films of oxidized zirconium. Applied Surface Science 72: 237-244. Lide, DR (2002) Handbook of Chemistry and Physics 83 ed. Boca Raton, 51-60. Wrobel, G, Sohier, MP, D'Huysser, A, Bonnelle, JP (1993) Hydrogenation catalysts based on nickel and rare earth oxides. Part II: XRD, electron microscopy and XPS studies of the cerium-nickel-oxygen-hydrogen system. Applied Catalysis A General 101: 73-93. Wröbel, G, Lamonier, C, Bennani, A, D'Huysser, A, Aboukais, A (1996) Effect of incorporation of copper or nickel on hydrogen storage in ceria. Mechanism of reduction. Journal of Chemical Society Faraday Transient 92(11): 2001-2009.

Younes, MK, Ghorbel, A, Rives, A, Hubaut, R (2000) Catalysts and catalysis properties of aerogels sulphated zirconia. Studies in Surface Science and Catalysis 130: 3219-3224, Elsevier D 3219.

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