Journal
APPLIED CATALYSIS A-GENERAL
Volume 643, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcata.2022.118725
Keywords
Switchable nature of reversible ionic liquids; Gold nanoparticles; SBA-15 mesoporous silica; Thermal stability
Categories
Funding
- National Science Foundation, USA [CAREER-1651597]
- Gene and Linda Voiland School of Chemical Engineering and Bioengineering
- Alexandra Navrotsky Institute for Experimental Thermodynamics at Washington State University, USA
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Reversible ionic liquids (RevILs) are used to synthesize colloidal gold nanoparticles and can switch between molecular and ionic forms. The RevIL-stabilized gold nanoparticles are deposited in the pores of SBA-15 mesoporous silica, which enhances their thermal stability and catalytic performance in the selective oxidation reaction of benzyl alcohol.
Reversible ionic liquids (RevILs) are ionic liquids that can be switched between molecular and ionic forms via two stimuli, and they can assist in the synthesis of colloidal gold nanoparticles. The RevIL-stabilized gold nanoparticles are deposited in the pores of SBA-15 mesoporous silica via incipient wetness without the functionalization of the SBA-15 surface. The location of nanoparticles inside the pores was confirmed by transmission electron microscopy technique and by a measured increase in the thermal stability of the nanoparticles in SBA-15 compared to non-porous silica. The porous gold catalysts are active in the selective oxidation of benzyl alcohol without calcination due to the absence of the ligands on the gold surface after deposition. Additionally, they are more active than the non-porous gold catalysts, indicating that the pore geometry enhances catalytic performance. Ultimately, the catalysts prepared by RevIL technique are thermally stable and active and show fine control over particle size.
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