Cu/Mg/Al mixed oxide

Auer, S. M., Wandeler, R., Gobel, U. and Baiker, A. (1997). Heterogeneous coupling of phenylethyne over Cu-Mg-Al mixed oxides - influence of catalyst composition and calcination temperature on structural and catalytic properties. J. Catal. 169, 1. 

Trombetta, M., Ramis, G., Busca, G., Montanari, B. and Yaccari, A. (1997). Ammonia adsorption and oxidation on Cu/Mg/Al mixed oxide catalysts prepared via hydrotalcite-type precursors. Langmuir 13, 4628. 

On Cu/Mg/Al mixed oxide catalysts, selective oxidation to N2 predominates, likely via hydrazine and other N N triple bond containing species, as surface intermediates. IR experiments show that over Cu/Mg/Al mixed oxide catalysts the reactivity of ammonia to give hydrazine and other compounds is not found... 

Haider, P. and Baiker, A. (2007). Gold Supported on Cu-Mg-Al-Mixed Oxides Strong Enhancement of Activity in Aerobic Alcohol Oxidation by Concerted Effect of Copper and Magnesium, J. Catal, 248, pp. 175-187. 

Calcined LDHs have been investigated as potential materials for the reduction of SOx and NOx emissions from FCCU in oil refineries [75,76]. Corma et al. found that mixed oxides obtained from a Cu/Mg/Al LDH precursor were the most effective at catalyzing both the oxidation of SO2 to S04 in the FCC regenerator and the reduction of sulfates to H2S, which may be recovered, in the reducing atmosphere of the cracking zone [76]. Calcined Cu/Mg/Al LDHs [77] and Co/Mg/Al LDHs [78], subsequently activated by heating under H2, can simultaneously remove SOx and NOx. In both cases, reduced transition metal species have been proposed as the active sites. 

Barrault. J Derouault. A Courtois, G Maissant. JM Dupin, JC Guimon. C Martinez, H Dumitriu. E. On the catalytic properties of mixed oxides obtained from the Cu-Mg-Al LDH precursors in the process of hydrogenation of the cinnamaldehyde. Applied Cataivsis A Generaly 2004 262,43-51. 

Haider et al. used ATR-IR with MBS to study the surface properties of Mg-Al and Cu-Mg-A1 mixed metal oxide supports for gold nanoparticles with various metal ratios. In previous work the group had found that Cu increased the activity of Au deposited on metal oxide supports for alcohol oxidation. CO2 was used to probe the various surfaces as C02-saturated toluene and N2-saturated toluene were cycled in the MES experiments. As opposed to conventional ATR-IR experiments, the addition of MES improved the spectral resolution and made it possible to distinctly identify bidentate and monodentate carbonate sirrface species. It was found that Mg- and Al-rich oxides formed bidentate species while Cu-rich metal oxide supports formed a mix of bidentate and monodentate carbonate species. 

The decarbonation of carbonated layered double hydroxides containing Mg with either Al, Fe or Cr bivalent cations or A1 with Mg, Ni, Cu or Zn divalent cations has been studied by thermal analysis. The enthalpy of adsorption of CO2 on the resulting calcined mixed oxides was measured by calorimetry, with initial heats of adsorption close to those reported for MgO (about lOOkJmol ) and a relatively homogeneous strength distribution [100],... 

In another study, Grygar et al. [68] investigated the formation of mixed Cu-Mn, Cu-Mn-Al, Cu-Mg-Mn, and Cu-Mg-Mn-Al oxides by the calcination of amorphous basic carbonates, or by the calcination of hydrotalcite-like precursors. A combination of XRD and electrochemical measurements (again reductive dissolutions in aqueous electrolytes) led to the crystalline and amorphous phases being identified, and their formation during the thermal treatment elucidated. 

The widespread applications of Al are summarized in Fig. 13.5a. Its strength can be increased by alloying with Cu or Mg. Aluminium oxide (see Section 13.7) has many important uses. Corundum (a-alumina) and emery (corundum mixed with the iron oxides magnetite and haematite) are extremely hard and are used as abrasives. Diamond is... 

---