Insight into the nature and the transformation of the hydroxyl species in the CeY zeolite

Abstract

The nature and the transformation of each potential hydroxyl species in a Ce-modified Y zeolite during the calcination process have been investigated via the information of the hydroxyl spectra of...

Construction of Ptδ+–O(H)–Ti3+ Species for Efficient Catalytic Production of Hydrogen

“…Water-induced structure change of the Pt/TiO 2 -S was explored by feeding D-labeled water steam (D 2 O) because deuterated hydroxyl species are mainly located at 2600–2800 cm –1 , which are out of the >3000 cm –1 region to avoid the influence of water. , As shown in Figures d and S20, the Ti 3+ –OD signal was observed at 2751 cm –1 , which are unchanged after He purging at 150 °C for 30 min (Figure d), indicating its high stability . EPR characterization supports the stability of the Ti 3+ species after being treated with water (Figure S21a).…”

Brønsted acid sites in the Beta zeolite induced highly efficient amidation of styrene in the aqueous phase

“…Deuteration of Brønsted acidic sites in the zeolite was easily realized when the zeolite was exposed to D 2 O at high temperature, as reported by Song. 41 When 1a- d 2 was used as a substrate, a 4a- d 2 product was formed and product 3a was not detected (Scheme 1(b)). It can be speculated that the hydrogen atom bound to the amide group and the hydrogen atom bound to the deutero-methyl group in product 4a- d 2 originated from the molecular water.…”

Effect of Calcination Temperature on the Adsorption Performance of Tanggamus Natural Zeolite for Ammonium Removal from Shrimp Pond Wastewater

“…The FTIR spectrum of the natural zeolite (ZA) revealed distinct absorption bands at 3413, 1635, and 1026 cm −1 . The band observed at 3413 cm −1 is attributed to the O-H stretching vibration of the hydroxyl group ( OH) present within the zeolite structure (Hui et al, 2022;Derbe et al, 2021). These groups are usually associated with water molecules, either adsorbed onto the zeolite surface or trapped within its porous structure.…”