Abstract
Copper species in the structure of Cu/core–shell Al-MCM-41 catalysts prepared by different techniques of Cu loading including substitution, ion-exchange, and impregnation methods were characterized by using temperature-programmed reduction, surface area and porosity analyzer, diffuse reflectance UV–vis-near-infrared spectroscopy, Fourier transforms infrared spectroscopy. Cu2+ in tetrahedral coordination was mostly found from the substitution method. However, from this method CuO was formed from the excess solution of copper nitrate trapped within pores of Al-MCM-41. For the ion-exchange method, only Cu2+ ions were detected. On the other hand, for the impregnation method with high copper loading, the observed copper species was CuO crystals, while with low copper loading both CuO and Cu2+ ions were detected. The acidity of catalysts was also studied by NH3-TPD. It was found that the distinction of copper species in the structure had an effect on Brønsted acid of pre- and post-reduction catalysts, especially in the impregnation method. This study reveals a perspective in the fundamental understanding of copper species-based catalysis.
Sign-in/Register to access full text options 
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 callMore From: Colloids and Surfaces A: Physicochemical and Engineering Aspects
Disclaimer: 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.
