Abstract
Chromium(III) ions were inserted in magnesium hydroxide layers via co-precipitation route. In the low-chromium content sample, Cr(III) ions are present mostly at octahedral sites of metal hydroxide layers, while some Cr(VI) species formed on the external surface of the high-chromium content catalyst. The Cr-doped metal hydroxide layer ions play as active sites for the oxidation of styrene with H2O2 at a low temperature. The insertion of chromium(III) in the brucite-like sheets enhanced catalytic stability of catalysts in the oxidation of styrene. The Cr-doped hydrotalcites showed a good activity (50–60%), and high selectivity to benzaldehyde (80–85%) at room temperature.
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