Methanation of CO<sub>2</sub> over High Surface Nickel/Aluminates Compounds Prepared by a Self-Generated Carbon Template
Catalytic gas-phase hydrogenation of CO<sub>2</sub> into CH<sub>4</sub> was tested under three different nickel/aluminate catalysts obtained from precursors of hexaaluminate composition (MAl<sub>16</sub>O<sub>19</sub>, M = Mg, Ca, Ba). These catalysts...
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| Format: | Article |
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MDPI AG
2023-01-01
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| Series: | Catalysts |
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| Online Access: | https://www.mdpi.com/2073-4344/13/1/142 |
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| author | Sarra Roudane Noureddin Bettahar Alfonso Caballero Juan Pedro Holgado |
| author_facet | Sarra Roudane Noureddin Bettahar Alfonso Caballero Juan Pedro Holgado |
| author_sort | Sarra Roudane |
| collection | DOAJ |
| description | Catalytic gas-phase hydrogenation of CO<sub>2</sub> into CH<sub>4</sub> was tested under three different nickel/aluminate catalysts obtained from precursors of hexaaluminate composition (MAl<sub>16</sub>O<sub>19</sub>, M = Mg, Ca, Ba). These catalysts were prepared using a carbon template method, where carbon is self-generated from a sol-gel that contains an excess of citric acid and the Al and M salts (Ba<sup>2+</sup>, Ca<sup>2+</sup>, Mg<sup>2+</sup>) by two-step calcination in an inert/oxidizing atmosphere. This procedure yielded Ni particles decorating the surface of a porous high surface area matrix, which presents a typical XRD pattern of aluminate structure. Ni particles are obtained with a homogeneous distribution over the surface and an average diameter of ca 25–30 nm. Obtained materials exhibit a high conversion of CO<sub>2</sub> below 500 °C, yielding CH<sub>4</sub> as a final product with selectivity >95%. The observed trend with the alkaline earth cation follows the order NiBaAlO-PRx > NiCaAlO-PRx > NiMgAlO-PRx. We propose that the high performance of the NiBaAlO sample is derived from both an appropriate distribution of Ni particle size and the presence of BaCO<sub>3</sub>, acting as a CO<sub>2</sub> buffer in the process. |
| first_indexed | 2024-03-09T13:14:50Z |
| format | Article |
| id | doaj.art-b77a3b8737254bbfacb1f0e43ccc2fa0 |
| institution | Directory Open Access Journal |
| issn | 2073-4344 |
| language | English |
| last_indexed | 2024-03-09T13:14:50Z |
| publishDate | 2023-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Catalysts |
| spelling | doaj.art-b77a3b8737254bbfacb1f0e43ccc2fa02023-11-30T21:37:54ZengMDPI AGCatalysts2073-43442023-01-0113114210.3390/catal13010142Methanation of CO<sub>2</sub> over High Surface Nickel/Aluminates Compounds Prepared by a Self-Generated Carbon TemplateSarra Roudane0Noureddin Bettahar1Alfonso Caballero2Juan Pedro Holgado3Laboratoire de Chimie des Matériaux Inorganiques et Applications, Université des Sciences et de la Technologie d’Oran, Mohamed-Boudiaf, l Mnaouar BP 1505, Bir El Djir 31000, Oran, AlgeriaLaboratoire de Chimie des Matériaux Inorganiques et Applications, Université des Sciences et de la Technologie d’Oran, Mohamed-Boudiaf, l Mnaouar BP 1505, Bir El Djir 31000, Oran, AlgeriaDepartamento de Química Inorgánica, Instituto de Ciencia de Materiales de Sevilla (CSIC-US), Av. Américo Vespucio, 49, 41092 Sevilla, SpainDepartamento de Química Inorgánica, Instituto de Ciencia de Materiales de Sevilla (CSIC-US), Av. Américo Vespucio, 49, 41092 Sevilla, SpainCatalytic gas-phase hydrogenation of CO<sub>2</sub> into CH<sub>4</sub> was tested under three different nickel/aluminate catalysts obtained from precursors of hexaaluminate composition (MAl<sub>16</sub>O<sub>19</sub>, M = Mg, Ca, Ba). These catalysts were prepared using a carbon template method, where carbon is self-generated from a sol-gel that contains an excess of citric acid and the Al and M salts (Ba<sup>2+</sup>, Ca<sup>2+</sup>, Mg<sup>2+</sup>) by two-step calcination in an inert/oxidizing atmosphere. This procedure yielded Ni particles decorating the surface of a porous high surface area matrix, which presents a typical XRD pattern of aluminate structure. Ni particles are obtained with a homogeneous distribution over the surface and an average diameter of ca 25–30 nm. Obtained materials exhibit a high conversion of CO<sub>2</sub> below 500 °C, yielding CH<sub>4</sub> as a final product with selectivity >95%. The observed trend with the alkaline earth cation follows the order NiBaAlO-PRx > NiCaAlO-PRx > NiMgAlO-PRx. We propose that the high performance of the NiBaAlO sample is derived from both an appropriate distribution of Ni particle size and the presence of BaCO<sub>3</sub>, acting as a CO<sub>2</sub> buffer in the process.https://www.mdpi.com/2073-4344/13/1/142heterogeneous catalystsmethanationnickel nanoparticlesSabatier reactioncarbon dioxide depletion |
| spellingShingle | Sarra Roudane Noureddin Bettahar Alfonso Caballero Juan Pedro Holgado Methanation of CO<sub>2</sub> over High Surface Nickel/Aluminates Compounds Prepared by a Self-Generated Carbon Template Catalysts heterogeneous catalysts methanation nickel nanoparticles Sabatier reaction carbon dioxide depletion |
| title | Methanation of CO<sub>2</sub> over High Surface Nickel/Aluminates Compounds Prepared by a Self-Generated Carbon Template |
| title_full | Methanation of CO<sub>2</sub> over High Surface Nickel/Aluminates Compounds Prepared by a Self-Generated Carbon Template |
| title_fullStr | Methanation of CO<sub>2</sub> over High Surface Nickel/Aluminates Compounds Prepared by a Self-Generated Carbon Template |
| title_full_unstemmed | Methanation of CO<sub>2</sub> over High Surface Nickel/Aluminates Compounds Prepared by a Self-Generated Carbon Template |
| title_short | Methanation of CO<sub>2</sub> over High Surface Nickel/Aluminates Compounds Prepared by a Self-Generated Carbon Template |
| title_sort | methanation of co sub 2 sub over high surface nickel aluminates compounds prepared by a self generated carbon template |
| topic | heterogeneous catalysts methanation nickel nanoparticles Sabatier reaction carbon dioxide depletion |
| url | https://www.mdpi.com/2073-4344/13/1/142 |
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