基于氯化钠模板法合成用于过氧化氢直接合成和一氧化碳氧化的TiO-Pd/Pt中空纳米球

NaCl-template-based synthesis of TiO-Pd/Pt hollow nanospheres for HO direct synthesis and CO oxidation.

作者信息

Liebertseder Mareike, Wang Di, Cavusoglu Gülperi, Casapu Maria, Wang Sheng, Behrens Silke, Kübel Christian, Grunwaldt Jan-Dierk, Feldmann Claus

机构信息

Institute of Inorganic Chemistry (IAC), Karlsruhe Institute of Technology (KIT), Engesserstraße 15, D-76131 Karlsruhe, Germany.

出版信息

Nanoscale. 2021 Jan 28;13(3):2005-2011. doi: 10.1039/d0nr08871d.

DOI:10.1039/d0nr08871d

PMID:33444428

Abstract

TiO2 hollow nanosphere (HNS) are prepared via NaCl templates in a one-pot approach. The NaCl templates are realized by solvent/anti-solvent strategies and coated with TiO2via controlled hydrolysis of Ti-alkoxides. The NaCl template can be easily removed by washing with water, and the TiO2 HNS are finally impregnated with Pd/Pt. Electron microscopy shows TiO2 HNS with an outer diameter of 140-180 nm, an inner cavity of 80-100 nm, and a wall thickness of 30-40 nm. The TiO2 HNS exhibit high surface area (up to 370 m2 g-1) and pore volume (up to 0.28 cm3 g-1) with well-distributed small Pd/Pt nanoparticles (Pt: 3-4 nm, Pd: 3-7 nm). H2O2 direct synthesis (room temperature, liquid phase) and CO oxidation (up to 300 °C, gas phase) are used to probe the catalytic properties and result in a good stability of the HNS structure as well as a promising performance with a H2O2 selectivity of 63% and a productivity of 3390 mol kgPd-1 h-1 (TiO2-Pd HNS, 5 wt%) as well as CO oxidation light-out temperatures of 150 °C (TiO2-Pt HNS, 0.7 wt%).

摘要

通过NaCl模板以一锅法制备TiO₂空心纳米球（HNS）。NaCl模板通过溶剂/反溶剂策略实现，并通过钛醇盐的受控水解涂覆TiO₂。通过水洗可轻松去除NaCl模板，最终在TiO₂ HNS中浸渍Pd/Pt。电子显微镜显示TiO₂ HNS的外径为140 - 180 nm，内腔为80 - 100 nm，壁厚为30 - 40 nm。TiO₂ HNS具有高比表面积（高达370 m² g⁻¹）和孔体积（高达0.28 cm³ g⁻¹），且分布均匀的小Pd/Pt纳米颗粒（Pt：3 - 4 nm，Pd：3 - 7 nm）。H₂O₂直接合成（室温，液相）和CO氧化（高达300 °C，气相）用于探测催化性能，结果表明HNS结构具有良好的稳定性，以及具有63%的H₂O₂选择性和3390 mol kgPd⁻¹ h⁻¹的产率（TiO₂ - Pd HNS，5 wt%）以及150 °C的CO氧化起燃温度（TiO₂ - Pt HNS，0.7 wt%）的良好性能。