The formation of gold nanoparticles in mordenites has been studied by the methods of FTIR spectroscopy of adsorbed CO and diffuse reflectance UV-visible spectroscopy. Different states of ionic and metallic gold were detected in the zeolite cavities and on the external surface of the zeolite – Au + and Au 3+ ions, charged clusters Au n δ+, and neutral nanoparticles Au m . The relative amount of these states depends on the method of sample preparation, type of redox treatment and the SiO 2/ Al 2 O 3 molar ratio.
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Pestryakov et al. (2005) studied this question.
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