Abstract
Epoxidation of styrene to styrene oxide (SO) by molecular oxygen was studied over cesium promoted silver nanowires catalysts. Styrene oxide (SO) and phenylacetaldehyde (Phe) were the main products. The results showed that Cs plays an important role improving the efficiency of the catalyst. The effect of the reaction temperature and the O 2:C 8H 8 molar ratio on the catalytic epoxidation was also investigated. Low reaction temperatures or high O 2:C 8H 8 ratios increase the selectivity to SO. The catalytic activity shows a maximum for silver nanowires promoted with 0.25 wt.% of Cs, achieving 94.6% of conversion and total selectivity to desired oxidation products (styrene oxide and phenylacetaldehyde). Besides, negligible deactivation of the catalyst was observed over 30 days of reaction. The experimental characterization was performed by X-ray diffraction (XRD), scanning electron microscopy (SEM), temperature-programmed reduction (TPR) and X-ray photoelectron spectroscopy (XPS). The presence of cesium plays a strong role in reducibility of the silver as detected by temperature-programmed reduction analysis affecting the catalytic activity. The results also suggested the presence of two different species of oxygen formed on the silver nanowires surface after oxygen exposure.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
