Synthesis of nanostructured composites of metals by supercritical deposition (SCD)

Erkey, Can; Türk, Michael

doi:10.1016/b978-0-444-64089-5.00001-9

Cited by 5 publications

(2 citation statements)

References 164 publications

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“…More details regarding the SFRD process, the equipment and further experimental details can be found elsewhere. [16,17,29] CO oxidation. Sieved catalyst powders (5 mg, 125-250 μm grain size) were deposited in quartz microreactors (Ø: 1.5 mm) with glass wool plugs in front and at the back of the catalyst bed.…”

Section: Methodsmentioning

confidence: 99%

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TiO₂−CeO_x−Pt Hollow Nanosphere Catalyst for Low‐Temperature CO Oxidation

Liebertseder,

Maliakkal,

Crone

et al. 2023

ChemCatChem

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TiO2−CeO2−Pt hollow nanospheres (1 wt‐% Pt) are realized using a liquid‐phase strategy using NaCl as a template. The NaCl template is first coated with TiO2 and thereafter with CeO2 via the hydrolyzation of TiCl(OiPr)3 and Ce(OiPr)4 as suitable alkoxides. Finally, the NaCl template is removed by washing with water. The resulting @TiO2−CeO2 hollow nanospheres (□: inner cavity) exhibit an outer diameter of 140–180 nm, a wall thickness of 30–40 nm, an inner cavity of 80–100 nm, a specific surface area of 210 m2/g, a pore volume and area of 0.08 cm3/g and 191 m2/g, mainly with micropores ≥5 Å and ≤14 Å. The hollow nanosphere support is impregnated with Pt nanoparticles, using two different methods – a wet‐chemical deposition (Pt(ac)2, acetone, 25 °C) and a supercritical fluid reactive deposition (SFRD) process ([Pt(COD)Me2], supercritical CO2, 80 °C, 15.6 MPa) resulting in an uniform size distribution with Pt nanoparticles 2.5±0.1 nm (TiO2−CeO2−PtWCD) and 2.3±0.1 nm (TiO2−CeO2−PtSFRD) in size. The catalytic properties of the TiO2−CeO2−Pt hollow nanospheres are evaluated for CO oxidation between 50 and 500 °C. A promising catalytic activity and stable light‐out/light‐off temperatures are observed especially for the TiO2−CeO2−PtSFRD sample, indicating the suitability of hollow nanospheres as high‐porosity catalyst material.

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Section: Methodsmentioning

confidence: 99%

“…At the end of the experiment, the system was slowly depressurized and cooled to ambient conditions. More details regarding the SFRD process, the equipment and further experimental details can be found elsewhere [16,17,29] …”

Section: Methodsmentioning

confidence: 99%