Journal article
Mesoporous metal - silica materials: Synthesis, catalytic and thermal properties
Microporous and mesoporous materials, v 257, pp 175-184
01 Feb 2018
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Here, we report a simple and scalable synthesis strategy of metal (Ni or Cu) nanoparticles uniformly distributed inside a mesoporous silica matrix. This method involves incorporation of metal nitrates and citric acid in a stable silica gel through controlled hydrolysis of tetraethyl orthosilicate. Combustion of dried gels with ammonium nitrate in an inert gas atmosphere enables preparation of highly porous Ni/SiO2 and Cu/SiO2 nanomaterials with tunable metal content (-5-30 wt.%). This approach also allows for independent tuning of the metal nanoparticle size (from 2 to 50 nm) and textural parameters, such as surface area (50-600 m(2)/g), average pore size (3-8 nm), and pore volume (0.05-0.6 cm(3)/g) of the materials during the one-step combustion. This new approach also enables uniform incorporation of metal nanoparticles within a porous silica matrix. This feature allows for synthesis of encapsulated stable ultra-small metallic nanoparticles with unusual properties. We tested Ni/SiO2 nanoscale materials with different textural parameters as catalysts in the ethanol decomposition reaction. The catalysts exhibited high activity toward hydrogen generation for 100 h. The relevant links between the textural parameters and stability of the catalysts are revealed. Characterization of the spent catalysts showed no structural changes, indicating superior stability over long periods of time. We also used spark plasma sintering (SPS) of Ni/SiO2 and Cu/SiO2 nanoscale materials to fabricate porous (70-80%) compact samples. These materials exhibited significantly low thermal diffusivity, which makes them attractive for thermal management applications. We also showed that the simple preparation method allows for production of large batches of final product, such as 10-50 g, in laboratory conditions. (C) 2017 Elsevier Inc. All rights reserved.
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Details
- Title
- Mesoporous metal - silica materials: Synthesis, catalytic and thermal properties
- Creators
- Khachatur V. Manukyan - University of Notre DameArmenuhi V. Yeghishyan - University of Notre DameChristopher E. Shuck - University of Notre DameDmitry O. Moskovskikh - National University of Science and Technology (MISiS), Moscow, 119049, Russia.Sergei Rouvimov - University of Notre DameEduardo E. Wolf - University of Notre DameAlexander S. Mukasyan - University of Notre Dame
- Publication Details
- Microporous and mesoporous materials, v 257, pp 175-184
- Publisher
- Elsevier
- Number of pages
- 10
- Grant note
- K2-2016-065 / Ministry of Education and Science of the Russian Federation; Ministry of Education and Science, Russian Federation
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000418106600020
- Scopus ID
- 2-s2.0-85028313035
- Other Identifier
- 991019296803604721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Chemistry, Applied
- Chemistry, Physical
- Materials Science, Multidisciplinary
- Nanoscience & Nanotechnology