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The influence of calcination temperatures on the dispersion of Ir/SiO2 catalysts has been studied. At low calcination temperatures, the chloride precursor was dispersed on the silica surface and formed highly dispersed Ir/SiO2 catalysts upon reduction. At high calcination temperatures, the formation of IrO2 was confirmed, which resulted in low dispersion after reduction.
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Shibuya et al. (2010) studied this question.
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