Demonstration of the Use of 3D X-ray Tomography to Compare the Uniformity of Catalyst Coatings in Open-Cell Foams
Abstract
:1. Introduction
2. Material and Methods
2.1. Open Cell Foams
2.2. Coating Protocols
- The bismuth molybdenum oxide suspension is prepared by ball-milling the catalyst (15 g) in a mixture of water (12.5 g), Ludox AS40 (12.5 g) and PEG 200 (0.15 g) during 45 min at 300 rpm.
- blowing air manually in every direction (axially and radially) with a flow-rate of 30 to 45 L/min with the object at 6–8 cm from the air gun (diameter of the air gun = 3 mm). It has to be mentioned that this method is not reproducible at all and is totally dependent of the experimenter, despite it being the most widely used method (Method A).
- immobilizing the foam in a tube and blowing with air axially, with a flow-rate of 30 to 45 L/min in a cylinder of 2 cm diameter, the object being at 10 cm from the air gun (Method B).
- spin-drying/centrifuging at 400 to 800 rpm (Method C).
2.3. Characterization of the Catalyst Layer Distribution
3. Results and Discussion
3.1. Properties of the Bare Foam
3.2. Preliminary Experiments—Alumina Layer on Aluminum Parallelepipedic Foam
3.3. Different Couples Catalyst-Foam in Cylindrical Geometry
3.3.1. Alumina/FeCrAl
3.3.2. Alumina/SiC
3.3.3. Bi2MoO6/FeCrAl
3.3.4. Perspective Use of Contrast Agent
4. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Material | Void Fraction % | Specific Surface Area m/m | Cell Size m |
---|---|---|---|
Al−40PPI * | 90 | 1500 | 1400 |
FeCrAl−40PPI | 91 | 1460 | 1350 |
SiC−50PPI | 89 | 2270 | 1100 |
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Zanota, M.-L.; Pallier, S.; Dousse, A.; Lachambre, J.; Meille, V. Demonstration of the Use of 3D X-ray Tomography to Compare the Uniformity of Catalyst Coatings in Open-Cell Foams. ChemEngineering 2018, 2, 52. https://doi.org/10.3390/chemengineering2040052
Zanota M-L, Pallier S, Dousse A, Lachambre J, Meille V. Demonstration of the Use of 3D X-ray Tomography to Compare the Uniformity of Catalyst Coatings in Open-Cell Foams. ChemEngineering. 2018; 2(4):52. https://doi.org/10.3390/chemengineering2040052
Chicago/Turabian StyleZanota, Marie-Line, Stéphanie Pallier, Anaïs Dousse, Joël Lachambre, and Valérie Meille. 2018. "Demonstration of the Use of 3D X-ray Tomography to Compare the Uniformity of Catalyst Coatings in Open-Cell Foams" ChemEngineering 2, no. 4: 52. https://doi.org/10.3390/chemengineering2040052