Abstract
Abstract A series of CoxSiBEA zeolite catalysts has been prepared by postsynthesis procedure with various Co content (from 1 to 9 wt% Co). The catalytic properties of these materials in SCR of NO with ammonia and N2O decomposition were studied. XRD, FTIR, DR UV–vis, TPR and XPS results show that two-step postsynthesis method allows to control the introduction of cobalt into zeolite and to obtain catalyst with specific Co sites. Introduction of cobalt into SiBEA zeolite leads to an increase in unit cell parameters of the BEA matrix and consumption of silanol groups present in vacant T-atom sites of dealuminated BEA as shown by XRD and FTIR spectroscopy. Cobalt is stabilized in CoxSiBEA in the form of two kinds of Co(II) species. They are characterized by an unusually high reduction temperature, which indicates that the cobalt is in strong interaction with the SiBEA support. It is shown by DR UV–vis and XPS that for low content (
Published Version
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