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Preparation and physicochemical characterisation of thermally stable nano-sized hopcalite catalysts
by S.N. Basahel, E.H. El-Mossalamy, M. Mokhtar
International Journal of Nanomanufacturing (IJNM), Vol. 4, No. 1/2/3/4, 2009
Abstract: Hopcalite catalyst precursors were prepared by coprecipitation under constant pH and temperature. The thermal behaviour of catalyst precursor was investigated using TG and DTA. The crystal structure and solid-solid interactions were studied using powder X-ray diffraction (PXRD). The particle sizes of the prepared solids were computed using Scherer equation. The surface area of the prepared catalysts using adsorption of nitrogen at 77K and the catalytic activity towards CO oxidation by O₂ were investigated. The computed values for the crystallite size of Cu_1.5Mn_1.5O₄ phase ranged between 52 nm and 80 nm for all solid samples. The produced Cu_1.5Mn_1.5O₄ phase remained as a nanocrystalline solid even by heating at 950°C. The kinetics of thermal decomposition of catalyst precursors suggest a mechanism for the solid-solid interaction between these oxides and clarify the formation of nanosized hopcalite spinel. The activation energy data derived from thermal kinetics revealed that the best chemical composition of the hopcalite system which shows a large surface area and higher catalytic activity is that with Cu/Mn = 3.

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