Reversible Ionic Liquids (RevILs) for the Preparation of Thermally Stable SBA-15 Supported Gold Nanoparticle Catalysts
Reversible Ionic Liquids (RevILs) for the Preparation of Thermally Stable SBA-15 Supported Gold Nanoparticle Catalysts
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DOI：
10.1016/j.apcata.2022.118725
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发表时间：
2022-06
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影响因子：
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通讯作者：
Zengran Sun;Ellis Hammond-Pereira;Xianghui Zhang;Di Wu;S. Saunders
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作者：
Zengran Sun;Ellis Hammond-Pereira;Xianghui Zhang;Di Wu;S. Saunders
可逆离子液体（RevIL）是一种可以通过两种刺激在分子和离子形式之间切换的离子液体，它们可以辅助合成胶体金纳米颗粒。RevIL稳定的金纳米粒子通过初湿含浸法沉积在SBA-15介孔二氧化硅的孔中，而不对SBA-15表面进行官能化。通过透射电子显微镜技术和通过与无孔二氧化硅相比在SBA-15中的纳米颗粒的热稳定性的测量增加来确认纳米颗粒在孔内的位置。由于沉积后金表面上没有配体，因此多孔金催化剂在苯甲醇的选择性氧化中不需要煅烧就具有活性。此外，它们比无孔金催化剂更有活性，表明孔几何形状增强了催化性能。最终，通过RevIL技术制备的催化剂是热稳定的和活性的，并且显示出对粒度的精细控制。
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.