Platinum clusters confined in FAU–LTA hierarchical porous composite with a core–shell structure
| Autor: | Xiaoqin Zou, Ka-Lun Wong, Svetlana Mintova, T. H. Metzger, Sébastien Thomas, Valentin Valtchev |
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| Přispěvatelé: | Dalton Cardiovascular Research Center [Columbia], University of Missouri [Columbia] (Mizzou), University of Missouri System-University of Missouri System, Laboratoire catalyse et spectrochimie (LCS), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Institut de Chimie du CNRS (INC)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), Laboratoire de Matériaux à Porosité Contrôlée (LMPC), Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Ecole Nationale Supérieure de Chimie de Mulhouse-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2011 |
| Předmět: |
Scanning electron microscope
chemistry.chemical_element Mineralogy Sorption Crystal growth 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Molecular sieve 01 natural sciences Catalysis 0104 chemical sciences law.invention Chemical engineering chemistry law [CHIM]Chemical Sciences Crystallization 0210 nano-technology Platinum Zeolite Single crystal ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Catalysis Today Catalysis Today, Elsevier, 2011, 168 (1), pp.140-146. ⟨10.1016/j.cattod.2010.12.034⟩ |
| ISSN: | 0920-5861 |
| DOI: | 10.1016/j.cattod.2010.12.034 |
| Popis: | Hierarchical porous composite with a core–shell structure possessing FAU-type zeolite core (zeolite X) and LTA-type zeolite shell (zeolite A) has been prepared. The intimate growth of zeolite shell is achieved by in situ crystallization of the LTA zeolite crystals with size of 1 μm on large single FAU-type crystals with size of about 60–90 μm. Direct visualization of the core–shell material is provided by X-ray microbeam measurements using synchrotron radiation on a single crystal complemented with field emission scanning electron microscopic study. The nitrogen sorption data confirmed that the access to large single FAU-type core is controlled by the defect-free LTA-type shell. Sorption measurements showed that about 98% of core crystals are covered by the LTA shells. Further the FAU–LTA core–shell material is used as a host for the stabilization of platinum clusters. The Pt location, mean size and distribution have been studied by CO chemisorption followed by FT-IR spectroscopy. High loading of platinum accessible to CO molecules in the core–shell material is achieved. The use of the FAU–LTA matrix allowed the stabilization of two different sizes of Pt clusters. Additional advantage of the core–shell material is the protection of the clusters from thermal sintering and poisoning, which is of significant importance for future catalysts. |
| Databáze: | OpenAIRE |
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