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Dawsonite-Type Precursors for Catalytic Al, Cr, and Fe Oxides: Synthesis and Characterization
Dawsonite-Type Precursors for Catalytic Al, Cr, and Fe Oxides: Synthesis and Characterization
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Asma A. Ali,† Muhammad A. Hasan,† and Mohamed I. Zaki*‡
2005
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Preparation of dawsonite-type compounds, NH4M(CO3)(OH)2, was attempted for M = Al, Cr, or Fe, using a hydrothermal method under various basicity and thermal conditions. Crystalline structure and chemical composition verification studies, employing X-ray diffractometry, infrared spectroscopy, and elemental analyses, revealed that a successful preparation is critically dependent on the availability of MO(OH)- and HCO3- reaction species, which is facilitated at pH value in the vicinity of 10 and te
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