SU‐101 was screened for the acid‐catalyzed ring‐opening alcoholysis of cyclohexene oxide. Results indicated access to open metal sites within SU‐101, a fundamental requirement (Lewis acid Bi+3 sites) for this reaction. In addition, SU‐101 exhibited high chemical stability, demonstrated by retaining its crystalline structure after the reaction. The cyclohexene conversion was estimated to be 99.8, 96.8, and 14.3 % at 40 °C for methanol, ethanol, and propanol, respectively. Also, SU‐101 demonstrated an outstanding catalytic cyclability performance for five cycles without losing catalytic activity.
In the present work, phenol was used as a model molecule to the photocatalytic evaluation of TiO2 impregnated with iron sulphide and chlorine on a visible-light reactor. The iron–chlorine catalyst was prepared by incipient impregnation with the metal precursors, Fe (NO3)3 and NaCl on previously calcined TiO2. The catalyst was sulphurized with H2S at 300 °C for 1 h. The catalysts were prepared at different chlorine concentrations using HYDRA chemical equilibrium diagrams to obtain different fractions of FeCl+. The oxide catalysts were characterized with diffuse reflectance (DRS UV–Vis) and temperature programmed reduction analysis (TPR). Sulphurized catalysts were characterized with Raman spectrometry and X-ray photoelectron spectrometry (XPS). The FeS–2Cl/TiO2 catalyst presented 8.35 times higher photodegradation than TiO2 and 6.4 times higher compared to the FeS–0.25Cl/TiO2 catalyst. DRS and XPS showed similar results of band gap, proving that the catalyst remain stable after sulphurisation. The TPR results of FeS–2Cl/TiO2 showed an increment of 86.29% in Fe2+/Fe3+ compared to FeS–0.25Cl/TiO2. XPS and Raman results for oxide and sulphated iron species relation suggested that FeS–2Cl/TiO2 decreased 4.45% compared to FeS–0.25Cl/TiO2 catalyst. XPS semiquantitative for S/Fe results showed that the FeS–2Cl/TiO2 catalyst increased 73.17% in comparison to FeS–0.25Cl/TiO2. These results suggested the increment of sulphurisation degree for FeS–2Cl/TiO2. In this regard, the catalyst characterization results showed that the presence of FeCl+ (0.85 fractions) in solution before impregnation promoted the active sulphide species maintaining the band gap and improved the degradation of phenol on visible light.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.