Mixed-metal nitrates

Ng, M.-F. Cima, M. J. 1997. Fleteroepitaxial growth of lanthanum aluminate films derived from mixed metal nitrates. J. Mat. Res. 12 1306-1314. 

Dining vacuum evaporation of an aqueous mixture of unspecified mixed metal nitrates and citric acid, the amorphous solid exploded when nearly dry. This was attributed to oxidation of the organic residue by the nitrates present, possibly catalysed by one of the oxides expected to be produced. 

A review has been published of the equilibrium and transport properties of low-melting mixed metal nitrates (e.g. NaN03 and AgN03).141... 

The superconducting oxides La gSr 2Cu04 and I YCujOy were prepared by decomposition of mixed metal nitrates. Thermogravimetric analysis and electron spin resonance measurements indicated the presence of Cu(I) and Cu(III) in the Lai.8Sr.2 u 4 phase. The compound I YC C prepared from the nitrates and subjected to an oxygen anneal at 425°C gave a sharp superconducting transition at 92 K. The phase was stoichiometric but readily decomposed when kept in contact with moist air. 

Well-ordered macroporous spinel-type and perovskite-type mixed iron oxide, Eai x Srx Ee03 and MFe204 (M = Ni, Zn, Co, Nii.x Zn ) can be prepared using a mixed metal nitrates solution in mixed solvent of EG and methanol.Ordered macroporous layered double... 

Mixed copper/zinc catalysts with high copper-to-zinc ratios are widely used as catalysts for low-pressure methanol production and for low-temperature shift reaction [2, 31], see also Chapter 15. These catalysts are commonly made by coprecipitating mixed-metal nitrate solutions by addition of alkali. Li and Inui [32] showed that apart from chemical composition, pH and temperature are key process parameters. Catalyst precursors were prepared by mixing aqueous solutions of copper, zinc, and aluminum nitrates (total concentration 1 mol/1) and a solution of sodium carbonate (1 mol/1). pH was kept at the desired level by adjusting the relative flow rate of the two liquids. After precipitation was complete, the slurry was aged for at least 0.5 h. When the precipitation was conducted at pH 7.0, the precipitate consisted of a malachite-like phase (Cu,Zn)C03(0H)2 and the resulting catalysts were very active, while at pH < 6 the formation of hydroxynitrates was favored, which led to catalysts less active than those prepared at pH 7.0 (Figure 7.8). 

Thin films of BaTi03 [11] and lead zirconate titanate [12] have been prepared by cathodic reduction. Konno and co-workers [13] have obtained thin films of La, M Cr03 (M = Ca, Sr) by heat treatment (700 °C, 10 min) of the hydroxy-chromate precursor obtained by cathodic reduction of a mixed metal nitrate solution containing (NH )2Cr20.j. Films of LaFeOj are prepared by heat treatment of an electrosynthesized hydroxide precursor at 7(X) °C (which is much lower than the temperature (>1000 C) used in the conventional ceramic preparation)... 

We reported that 3DOM Lai Sr, Fe03 (x = 0—0.2) was prepared using a mixed metal nitrate solution in mixed solvent of ethylene glycol and MeOH (entry 26) [41,42]. We reported that 3DOM LaFeOs prepared by our ethylene glycol-MeOH mixed solvent method showed higher catalytic activity for soot... 

C). When the infiltrated PMMA template composite is heated, mixed metal nitrates oxidize ethylene glycol to form mixed metal glyoxylate solid in the voids at a temperature lower than Tg of PMMA (about 100 °C) [41,77,78]. Further calcination removes the polymer template and causes the conversion of glyoxylate salt into LaFeOs [41,65,73]. 

The PdMgAl HTlcs can be synthesized by controlled coprecipitation at pH = 8.5 and a temperature of 55 °C, by co-feeding appropriate amounts of mixed metal nitrate and sodium carbonate solutions. A sodium carbonate solution was used as precipitating agent. Both solutions were added simultaneously dropwise, as described elsewhere [19]. Transmission electron microscopy (TEM) images of Pd nanoparticles were acquired using a FEI TITAN microscope as displayed in Fig. 13.16. 

Catalyst preparation evolved through the use of the mixed metal o.xides, the decomposition of mixed metal nitrates, and the precipitation of carbonates and hydroxides from solutions of metal salts. Because powders were difficult to handle, granules and pellets were produced using binders and tested in a variety of shapes and sizes. 

Patoux et al. have prepared NCM by mixed metal nitrate evoporation followed by calcination at temperatures ranging between 600°C and 1000°C [36]. The samples prepared by this method crystallise in the typical layered a-NaPe02 structure with lattice parameters a = 2.86 A and c = 14.24 A. The particle size increases progressively from 9 A for the sample synthesised at 600°C to 70 A at 1000°C. The first discharge curves from different upper cutoff votlage and their cyclablity is shown in Figure 7.22. 

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