Metallic fibers are promising supports to develop structured catalysts due to their high thermal stability, mechanical strength and geometrical surface area. However, such a high surface area is usually associated with small individual fibers and tiny pores, leading to pore blockage during coating process. Herein, electrodeposition is investigated as a simple way to deposit Rh/Mg/Al hydrotalcite-like materials on FeCrAl fibers. Several trials are performed to optimize the synthesis conditions in the electro-base generation method, using nitrates as precursors, focusing on total metal nitrate concentration and synthesis time. Combinations of both parameters are screened to find a balance between coating quality and loading. A low electrolyte concentration (e.g., <0.06 m) requires longer synthesis time to obtain an appropriate loading without pore blockage, whereas a high concentration (e.g., 0.10 m) may cause the deposition of undesired Rh0 particles. Tailoring the solid loading and decreasing the cracks in electrodeposited samples results in a quite stable coating during a further thermal treatment step to transform hydrotalcite-like compounds into oxide- and spinel-based catalysts. All tested catalysts are active in the catalytic partial oxidation of methane at gas hourly space velocity (GHSV) of 351 000 h−1, although their catalytic activities significantly depend on the coating properties.
Ho P.H., Ospitali F., Sanghez de Luna G., Fornasari G., Vaccari A., Benito P. (2020). Coating of Rh/Mg/Al Hydrotalcite-Like Materials on FeCrAl Fibers by Electrodeposition and Application for Syngas Production. ENERGY TECHNOLOGY, 8(1), 1-14 [10.1002/ente.201901018].
Coating of Rh/Mg/Al Hydrotalcite-Like Materials on FeCrAl Fibers by Electrodeposition and Application for Syngas Production
Ospitali F.;Sanghez de Luna G.;Fornasari G.;Vaccari A.;Benito P.
2020
Abstract
Metallic fibers are promising supports to develop structured catalysts due to their high thermal stability, mechanical strength and geometrical surface area. However, such a high surface area is usually associated with small individual fibers and tiny pores, leading to pore blockage during coating process. Herein, electrodeposition is investigated as a simple way to deposit Rh/Mg/Al hydrotalcite-like materials on FeCrAl fibers. Several trials are performed to optimize the synthesis conditions in the electro-base generation method, using nitrates as precursors, focusing on total metal nitrate concentration and synthesis time. Combinations of both parameters are screened to find a balance between coating quality and loading. A low electrolyte concentration (e.g., <0.06 m) requires longer synthesis time to obtain an appropriate loading without pore blockage, whereas a high concentration (e.g., 0.10 m) may cause the deposition of undesired Rh0 particles. Tailoring the solid loading and decreasing the cracks in electrodeposited samples results in a quite stable coating during a further thermal treatment step to transform hydrotalcite-like compounds into oxide- and spinel-based catalysts. All tested catalysts are active in the catalytic partial oxidation of methane at gas hourly space velocity (GHSV) of 351 000 h−1, although their catalytic activities significantly depend on the coating properties.File | Dimensione | Formato | |
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Coating of RhMgAl.pdf
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