Preparation and characterization of titanium dioxide nanotube array supported hydrated ruthenium oxide catalysts

Hwang

et al. 2014

Ind. Eng. Chem. Res.

We have developed the supported ruthenium catalyst (Ru(OH) x /ZrO 2 ) that shows highly efficient catalytic performance for the oxidation of activated, nonactivated, and heterocyclic alcohols with only 1 atm of molecular oxygen as a green oxidant. The ruthenium active site gave excellent aerobic alcohol oxidation reaction (turnover number (TON) = 63 000). The catalyst was easily recovered after the reaction and could be reused without a significant loss of its catalytic performance.

Section: Resultsmentioning

confidence: 74%

Section: Results and Discussionmentioning

confidence: 74%

Section: Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Zirconia-Supported Ruthenium Catalyst for Efficient Aerobic Oxidation of Alcohols to Aldehydes

Hwang

et al. 2014

Ind. Eng. Chem. Res.

Adv. Nat. Sci: Nanosci. Nanotechnol.

“…Scaling up the process to industry standard of 200 mm diameter wafers does not foresee any fabrication challenges. Aside from the well-established galvanostatic anodization, potentiostatic anodization is gaining attention in structuring micro-/nanomaterials lately[17,19,[28][29][30][31], and this work can be used as a block in building advanced technologies.…”

mentioning

confidence: 99%

Effect of surfactant and etching time on p-type porous silicon formation through potentiostatic anodization

Zeb¹,

Le²

2022

Self Cite

Electrochemical anodization provides the scalability required for structuring porous silicon (PSi) layers for mass production; hence, new and feasible processes are highly sought-after. We investigate the effect of surfactant (additive) and etching time on the morphology of PSi matrix in a simplistic two-electrode anodization cell using aqueous HF electrolyte. Instead of the conventional galvanostatic mode (constant current density), we use the rarely reported technique of potentiostatic anodization (constant applied potential) for engineering PSi surface morphology. We demonstrate that under a constant applied potential, channel-like morphology, pyramids or well-ordered macropores are easily achieved through either increasing the processing time or adding a small amount of surfactant into the electrolyte. Our results provide better understanding of the mechanism underlying the formation of PSi and propose a practical solution for obtaining application-specific macrostructure of PSi.

Enhancing the photocatalytic activity of Ga₂O₃–TiO₂ nanocomposites using sonication amplitudes for the degradation of Rhodamine B dye

Amdeha

El‐Salamony

Al-Sabagh

2019

Applied Organom Chemis

A Ga2O3–TiO2 photocatalyst was synthesized by a mechanomixing method followed by a sonication technique using different amplitudes of sonication (0%, 25%, 50%, and 75% of 20 kHz). The prepared photocatalysts were characterized by X‐ray diffraction, X‐ray photoelectron spectroscopy, Fourier‐transform infrared, Brunauer–Emmett–Teller (BET) surface area (SBET), zeta potential, and optical techniques. Ga2O3–TiO2 exhibited an excellent photocatalytic activity for Rhodamine B (RhB) dye degradation under UV irradiation. The RhB degradation rate rose linearly with the increase of sonication amplitude. The photodegradation rate (k) of the synthesized samples was calculated according to the Langmuir–Hinshelwood kinetic expression. It reached a maximum of 5.25 × 10−2 min−1 with R2 of 0.99 for Ga2O3–TiO2 (75%) photocatalysts. The main reactive species were detected through radical scavenging experiments. The formation of hole reactive species is the rate‐determining step in the case of Ga2O3–TiO2 (75%) photocatalysts.