One-pot direct synthesis route to self-assembled highly ordered Zn-decorated mesoporous aluminium oxide toward efficient and sustainable metathesis heterogeneous catalyst design. Issue 112 (29th October 2015)

• Record Type: Journal Article
• Authors: Abidli, Abdelnasser
• Is Part Of: RSC advances. Volume 5:Issue 112(2015)
• Page Start: 92743
• Page End: 92756
• Publication Date: 2015-10-29
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c5ra12057h
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Zn-modified well-ordered mesoporous alumina successfully synthesized via one-pot process and evaluated as support for rhenium-based catalyst for methyl oleate self-metathesis. Abstract : Hexagonally well-organized ZnCl2 -OMA materials have been successfully synthesized by a one-pot approach using a sol–gel method at ambient temperature and pressure. These materials were prepared through simultaneous self-assembly process with F127 as directing agent combined with in situ impregnation of ZnCl2 . The new approach was found to be compatible with various common aluminium precursors and carboxylic acids used as self-assembly interfacial protectors. The obtained ZnCl2 -OMA materials were fully characterized using XRD, N2 adsorption–desorption, TEM, SEM, EDX, XPS and 1 H and 27 Al MAS-NMR techniques. These materials were compared with the zinc chloride-doped organized mesoporous alumina (ZnCl2 -OMA) supports prepared through a conventional two steps process that includes OMA synthesis and then post-synthesis incorporation of ZnCl2 . Thus, the one-pot synthesized materials were found to exhibit improved properties compared to the conventional ones, particularly larger BET surface area. The synthesized ZnCl2 -OMA materials were then used as catalytic supports for methyltrioxorhenium (MTO), showing enhanced catalytic performance for methyl oleate self-metathesis, demonstrating better activity and selectivity towards desired metathesis products. These features are highly beneficial for large-scale materials synthesis through fast, simple, easy and low-cost introduction of functionalities on mesoporous materials surface without multi-step procedures.