Hydrothermal treatment of metallic-monolith catalyst support with self-growing porous anodic-alumina film

Zhang, Chuanqi; Pu, Yuanjing; Wang, Feng; Ren, HeCheng; Ma, Hua; Guo, Yu

doi:10.1016/j.cjche.2020.01.012

Cited by 6 publications

(1 citation statement)

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“…As a catalyst support, the chemical properties, pore structure, speci c surface area, and lm thickness of AAO materials will greatly affect its catalytic performance. In our previous work [12], the modi cation of pore morphology and chemical properties has been studied by using AAO lm with a thickness of 50 ~ 100 µm and a pore diameter of 30 ~ 70 nm. The combination of pore widening treatment (immersing in acid solution) and hydrothermal treatment could convert amorphous skeleton alumina into γ-alumina and change its smooth and parallel tube-like pore structure into a two-dimensional pore structure with a larger speci c surface area.…”

Section: Introductionmentioning

confidence: 99%

Influence of anodization parameters on film thickness and volume expansion of thick- and large-sized anodic aluminum oxide film

Yao

et al. 2021

J Mater Sci: Mater Electron

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Anodic aluminum oxide (AAO) lm with a thickness ranging from 20 to100 μm was prepared by using a large-sized Al plate (4 cm × 10 cm) to investigate the anodization parameter effect on the lm thickness and volume expansion factor. A corrosion treatment (voltage = 0 V) was performed to investigate the lm dissolution caused by acid. The actual anode surface temperature was also measured to con rm the eld-assisted nature of AAO dissolution. The lm thickness increases exponentially with temperature, and increases approximately linearly with voltage, duration or concentration. The volume expansion factor gives a rst rising and then falling trend with temperature or duration, while it has a nearly linear trend with voltage or concentration. The volume expansion factor increases with the intensi ed electric eld, while its decrease is attributed to the Joule heat-enhanced dissolution. In the case of large lm thickness (> 20 μm), the pore con nement effect may be one of the reasons for the change of volume expansion factor. In addition to the conventional parameters, the heat transfer-related parameters such as sample size also greatly affect the AAO lm growth.

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Section: Introductionmentioning

confidence: 99%