The oxalate route

The fully developed route is capable of producing powders of closely controlled stoichiometry, composition and particle size on a large scale commercial basis. 

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Recently, the microemulsion technique has been explored as an alternative route to prepare Cu/ZnO catalysts. The Cu/ZnO catalyst was prepared in a microemulsion system using the oxalate route. In spite of the low surface are and poor Cu dispersion, the catalysts obtained by this procedure, when compared to catalysts prepared by a classical co-impregnation method, were more active in H2 production through partial oxidation of methanol. The authors propose this enhancement in the activity to be due either to the presence of some specific... 

Enthalpy increments of Th02(cr) were measured using a high temperature Calvet drop calorimeter from 376 to 940 K (20 measurements). The Th02(cr), prepared by the oxalate route, contained less than 1000 ppm impurity, presumably including the 500 ppm MgO deliberately added as a sintering aid. 

Synthesis of BaPb03 via the oxalate route reported by Gan etal. [324] is an example of the general method discussed by them. In this procedure, the microemulsion systems consisted of NP-5/octane/aqueous phases, and the latter contained dissolved (i) Ba(N03)2 + Pb(N03)2 or (ii) oxalic acid. Mixing of the two microemulsions yielded a Ba,Pb-oxalate of average particle size 8 nm. A phase-pure BaPb03, composed of micron-sized agglomerates, was obtained at a calcination temperature of 650 C. 

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