Mesoporous Beta zeolite functionalisation with FexCry oligocations
[EN] In the presented study, H-Beta zeolite and H-Beta/meso (mesoporous Beta zeolite obtained by a mesotemplate-free method) were modified with Fe-3, Fe2Cr, FeCr2 and Cr-3 triple-metallic aggregates (oligocations) by ion-exchange method (for comparison modification with isolated Fe cations was also...
| Authors: | , , , , , , , |
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| Format: | article |
| Publication Date: | 2019 |
| Country: | España |
| Institution: | Universitat Politècnica de València (UPV) |
| Repository: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| Language: | English |
| OAI Identifier: | oai:riunet.upv.es:10251/159520 |
| Online Access: | https://riunet.upv.es/handle/10251/159520 |
| Access Level: | Open access |
| Keyword: | Beta zeolite Mesoporous Beta Oligocations NH3-SCO |
| Summary: | [EN] In the presented study, H-Beta zeolite and H-Beta/meso (mesoporous Beta zeolite obtained by a mesotemplate-free method) were modified with Fe-3, Fe2Cr, FeCr2 and Cr-3 triple-metallic aggregates (oligocations) by ion-exchange method (for comparison modification with isolated Fe cations was also done). Successful synthesis of mesoporous Beta zeolite was confirmed by several techniques such as N-2-sorption, PXRD, AAS or NH3-TPD. Modified porosity and acidity of the Beta zeolite, as well as the source of metals used, influenced the form (coordination and aggregation), content and reducibility of Fe- and Cr-species in the samples (UV-vis-DRS, AAS, H-2-TPR). The obtained samples were tested as catalysts in the process of selective catalytic oxidation of ammonia to dinitrogen (NH3-SCO). The highest activity and selectivity for nitrogen was obtained for the bimetallic Fe-Cr samples prepared by deposition of suitable oligocations. |
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