Incorporation of Silver Atoms into the Vacant T-Atom Sites of the Framework of SiBEA Zeolite as Mononuclear Ag(I) Evidenced by XRD, FTIR, NMR, DR UV–vis, XPS, and TPR

Abstract

An AgSiBEA zeolite has been prepared by a two-step postsynthesis procedure that consists of first creating the vacant T atom sites with associated silanol groups by treatment of TEABEA zeolite with nitric acid and then impregnating of resulting SiBEA zeolite with an aqueous solution of AgNO3. The incorporation of Ag ions into the vacant T atom sites of the framework of SiBEA zeolite as mononuclear Ag(I) has been evidenced by combined use of XRD, NMR, FTIR, diffuse reflectance UV–vis, XPS, and TPR. The consumption of OH groups has been monitored by FTIR. The Brønsted and Lewis acidities of AlBEA, SiBEA, and AgSiBEA have been identified by FTIR spectroscopy of adsorbed pyridine and CO as probe molecules.

Removal of ethylene from air stream by adsorption and plasma-catalytic oxidation using silver-based bimetallic catalysts supported on zeolite

“…Although the intensities of Ag 3d peaks were relatively weak due to the low silver content, a peak at binding energy of 368.1 eV for Ag 3d 5/2 and another at 374.1 eV for Ag 3d 3/2 can be recognized, indicating the existence of highly dispersed Ag(I) species in the zeolite matrix, which is in line with the earlier report [34].…”

ZnO Nanoclusters Supported on Dealuminated Zeolite β as a Novel Catalyst for Direct Dehydrogenation of Propane to Propylene

“…After loading with Zn species, the band at 3740 cm −1 becomes weak, indicating that Zn species bind to terminal oxygen atoms and even replace the silanol groups to some extent. Moreover, an intensive reduction of the 3460 cm −1 band is observed, revealing the Zn species are mainly boned to the silanol groups in vacant T sites …”

“…Moreover, an intensive reduction of the 3460 cm À 1 band is observed, revealing the Zn species are mainly boned to the silanol groups in vacant T sites. [47] The acidic properties of β zeolite before and after acid treatment and the Zn incorporation were evaluated by the mean of NH 3 -TPD technique. As shown in Figure 3a, the raw Hβ zeolite shows two major NH 3 desorption peaks centered at about 230 and 450°C, revealing the existence of weak and strong acid sites, respectively.…”

Identification of the silver state in the framework of Ag-containing zeolite by XRD, FTIR, photoluminescence,109Ag NMR, EPR, DR UV-vis, TEM and XPS investigations

“…SiBEA was then washed with distilled water and dried at 353 K. To incorporate Ag ions in the vacant T-atom sites two-step postsynthesis method were applied, described in our earlier report [23]. …”

“…Moreover, stabilization of silver in different oxidation states (Ag + and Ag 2+ ) may result in higher catalytic activity of Ag-containing catalysts, as was shown earlier for Sr 1-x To obtain well-dispersed silver species and to identify their state a two-step postsynthesis method was used, which developed earlier for preparation of metal-containing BEA zeolites [21,22]. This postsynthesis procedure allowed, for low metal content, 4 incorporating of silver ions in the framework of zeolite mainly as isolated mononuclear silver species without formation of metal oligomers or metal oxides [23].…”