Abstract
Mesoporous SBA-15 silicate with a high surface area was prepared by a hydrothermal method, successively modified by organic melamine ligands and then used for deposition of Pd nanoparticles onto it. The synthesized materials were characterized with infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), nitrogen physisorption, scanning electron microscopy (SEM) coupled with energy dispersive X-ray analysis (EDX), transmission electron microscopy (TEM), nuclear magnetic resonance (NMR) and inductively coupled plasma (ICP-OES). The catalyst was effectively used in the Mizoroki–Heck coupling reaction of various reactants in the presence of an organic base giving the desired products in a short reaction time and with small catalysts loadings. The reaction parameters such as the base type, amounts of catalyst, solvents, and the temperature were optimized. The catalyst was easily recovered and reused at least seven times without significant activity losses.Graphic
Highlights
In the synthetic organic chemistry and production of fine chemicals C–C cross-coupling reactions are highly ranked
The structure of SBA-15 derived material coupled with elemental analysis was investigated by scanning electron microscopy (Zeiss Leo—1530 Gemini) with a Thermo-NORAN vantage X-ray detector
Palladium nanoparticles size distributions and SBA-15 channels dimensions were investigated by transmission electron microscopy (TEM) performed on LEO 912 OMEGA (EFTEM) with acceleration voltage 120 kV and LaB6 electron source
Summary
In the synthetic organic chemistry and production of fine chemicals C–C cross-coupling reactions are highly ranked. Ordered mesoporous silica materials SBA-15 have a potential to be utilized in many different applications, catalysis being one of the most important The reasons for it are their properties, such as high surface areas (700–1200 m2 g−1), non-toxicity, chemical and physical inertness, abundance of silanol groups capable for functionalization, along with tunable physical properties such as the pore diameter and walls thickness. A typical example is design of palladium supported DHBP@ SBA-15 catalyst obtained by adding 2,2-dihydroxybenzopheneone ligand to amine functionalized mesoporous silica followed by metalation with Pd(II). This yielded a highly active catalyst in Mizoroki–Heck (arylation) and hydrogenation reactions without a significant loss of activity in several reaction cycles [25]. The scope was extended to different iodo-, bromo- and chloro-aromatic compounds
Sign-in/Register to view highlights & summary 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 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.
