Monitoring of the state of silver in porous oxides during catalyst preparation
Résumé
Silver-supported porous oxides are promising heterogeneous catalysts for air treatment. Classical ways of prepn. are incipient wet impregnation or ion exchange (in case of zeolites) of a support with silver nitrate. Nevertheless, this precursor is known for its photosensitivity. The latter can lead to prepns. that are not well controlled yet. In this contribution, the influence of the nature of the oxide support and of the thermal activation conditions towards the state and the dispersion of silver in the catalyst is investigated. Complementary characterization techniques are used, i.e. temp. programmed redn. (TPR) coupled with mass spectrometry (MS), UV-visible spectroscopy (UV-vis), and transmission electron microscopy (TEM). [on SciFinder(R)]