Synthesis Chemistry and Properties of Ni Catalysts Fabricated on SiC@Al<sub>2</sub>O<sub>3</sub> Core-Shell Microstructure for Methane Steam Reforming
Heat and mass transport properties of heterogeneous catalysts have significant effects on their overall performance in many industrial chemical reaction processes. In this work, a new catalyst micro-architecture consisting of a highly thermally conductive SiC core with a high-surface-area metal-oxid...
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MDPI AG
2020-04-01
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| Series: | Catalysts |
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| Online Access: | https://www.mdpi.com/2073-4344/10/4/391 |
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| author | Hyunju Lee Doohwan Lee |
| author_facet | Hyunju Lee Doohwan Lee |
| author_sort | Hyunju Lee |
| collection | DOAJ |
| description | Heat and mass transport properties of heterogeneous catalysts have significant effects on their overall performance in many industrial chemical reaction processes. In this work, a new catalyst micro-architecture consisting of a highly thermally conductive SiC core with a high-surface-area metal-oxide shell is prepared through a charge-interaction-induced heterogeneous hydrothermal construction of SiC@NiAl-LDH core-shell microstructures. Calcination and reduction of the SiC@NiAl-LDH core-shell results in the formation of Ni nanoparticles (NPs) dispersed on SiC@Al<sub>2</sub>O<sub>3</sub>, referred to as Ni/SiC@Al<sub>2</sub>O<sub>3</sub> core-shell catalyst. The Ni/SiC@Al<sub>2</sub>O<sub>3</sub> exhibit petal-like shell morphology consisting of a number of Al<sub>2</sub>O<sub>3</sub> platelets with their planes oriented perpendicular to the surface, which is beneficial for improved mass transfer. For an extended period of methane-stream-reforming reaction, the Ni/SiC@Al<sub>2</sub>O<sub>3</sub> core-shell structure remained stable without any significant degradation at the core/shell interface. However, the catalyst suffered from coking and sintering likely associated with the relatively large Ni particle sizes and the low Al<sub>2</sub>O<sub>3</sub> content. The synthesis procedure and chemistry for construction of supported Ni catalyst on the core-shell microstructure of the highly thermal conductive SiC core, and the morphology-controlled metal-oxide shell, could provide new opportunities for various catalytic reaction processes that require high heat flux and enhanced mass transport. |
| first_indexed | 2024-03-10T20:44:07Z |
| format | Article |
| id | doaj.art-9e2df580b1df408593396384dfc9086b |
| institution | Directory Open Access Journal |
| issn | 2073-4344 |
| language | English |
| last_indexed | 2024-03-10T20:44:07Z |
| publishDate | 2020-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Catalysts |
| spelling | doaj.art-9e2df580b1df408593396384dfc9086b2023-11-19T20:29:37ZengMDPI AGCatalysts2073-43442020-04-0110439110.3390/catal10040391Synthesis Chemistry and Properties of Ni Catalysts Fabricated on SiC@Al<sub>2</sub>O<sub>3</sub> Core-Shell Microstructure for Methane Steam ReformingHyunju Lee0Doohwan Lee1Catalysis and Nanomaterials Lab., Department of Chemical Engineering, University of Seoul, Siripdae-gil 13, Jeonnong-dong, Seoul 02504, KoreaCatalysis and Nanomaterials Lab., Department of Chemical Engineering, University of Seoul, Siripdae-gil 13, Jeonnong-dong, Seoul 02504, KoreaHeat and mass transport properties of heterogeneous catalysts have significant effects on their overall performance in many industrial chemical reaction processes. In this work, a new catalyst micro-architecture consisting of a highly thermally conductive SiC core with a high-surface-area metal-oxide shell is prepared through a charge-interaction-induced heterogeneous hydrothermal construction of SiC@NiAl-LDH core-shell microstructures. Calcination and reduction of the SiC@NiAl-LDH core-shell results in the formation of Ni nanoparticles (NPs) dispersed on SiC@Al<sub>2</sub>O<sub>3</sub>, referred to as Ni/SiC@Al<sub>2</sub>O<sub>3</sub> core-shell catalyst. The Ni/SiC@Al<sub>2</sub>O<sub>3</sub> exhibit petal-like shell morphology consisting of a number of Al<sub>2</sub>O<sub>3</sub> platelets with their planes oriented perpendicular to the surface, which is beneficial for improved mass transfer. For an extended period of methane-stream-reforming reaction, the Ni/SiC@Al<sub>2</sub>O<sub>3</sub> core-shell structure remained stable without any significant degradation at the core/shell interface. However, the catalyst suffered from coking and sintering likely associated with the relatively large Ni particle sizes and the low Al<sub>2</sub>O<sub>3</sub> content. The synthesis procedure and chemistry for construction of supported Ni catalyst on the core-shell microstructure of the highly thermal conductive SiC core, and the morphology-controlled metal-oxide shell, could provide new opportunities for various catalytic reaction processes that require high heat flux and enhanced mass transport.https://www.mdpi.com/2073-4344/10/4/391methane steam reformingNi catalystssilicon carbidelayered double hydroxidescore-shell catalysts |
| spellingShingle | Hyunju Lee Doohwan Lee Synthesis Chemistry and Properties of Ni Catalysts Fabricated on SiC@Al<sub>2</sub>O<sub>3</sub> Core-Shell Microstructure for Methane Steam Reforming Catalysts methane steam reforming Ni catalysts silicon carbide layered double hydroxides core-shell catalysts |
| title | Synthesis Chemistry and Properties of Ni Catalysts Fabricated on SiC@Al<sub>2</sub>O<sub>3</sub> Core-Shell Microstructure for Methane Steam Reforming |
| title_full | Synthesis Chemistry and Properties of Ni Catalysts Fabricated on SiC@Al<sub>2</sub>O<sub>3</sub> Core-Shell Microstructure for Methane Steam Reforming |
| title_fullStr | Synthesis Chemistry and Properties of Ni Catalysts Fabricated on SiC@Al<sub>2</sub>O<sub>3</sub> Core-Shell Microstructure for Methane Steam Reforming |
| title_full_unstemmed | Synthesis Chemistry and Properties of Ni Catalysts Fabricated on SiC@Al<sub>2</sub>O<sub>3</sub> Core-Shell Microstructure for Methane Steam Reforming |
| title_short | Synthesis Chemistry and Properties of Ni Catalysts Fabricated on SiC@Al<sub>2</sub>O<sub>3</sub> Core-Shell Microstructure for Methane Steam Reforming |
| title_sort | synthesis chemistry and properties of ni catalysts fabricated on sic al sub 2 sub o sub 3 sub core shell microstructure for methane steam reforming |
| topic | methane steam reforming Ni catalysts silicon carbide layered double hydroxides core-shell catalysts |
| url | https://www.mdpi.com/2073-4344/10/4/391 |
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