Synthesis of SAPO-34 on graphite foams for adsorber heat exchangers

Graphite cellular structures have been prepared and used as supports for direct synthesis of SAPO-34 zeolite. The zeolite deposition was obtained by hydrothermal synthesis after a preliminary oxidation of the graphite foams to increase their chemical affinity with the zeolite. The thermal conductivi...

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Bibliographic Details
Published in:Applied thermal engineering 2013-11, Vol.61 (2), p.848-852
Main Authors: Bonaccorsi, Lucio, Bruzzaniti, Paolo, Calabrese, Luigi, Freni, Angelo, Proverbio, Edoardo, Restuccia, Giovanni
Format: Article
Language:English
Subjects:
Adsorption heat pump
Applied sciences
Coatings
Deposition
Devices using thermal energy
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Foams
Graphite
Graphite foams
Heat exchangers (included heat transformers, condensers, cooling towers)
Heat pumps
Heat transfer
Surface chemistry
Synthesis
Theoretical studies. Data and constants. Metering
Thermal conductivity
Zeolites
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Summary:Graphite cellular structures have been prepared and used as supports for direct synthesis of SAPO-34 zeolite. The zeolite deposition was obtained by hydrothermal synthesis after a preliminary oxidation of the graphite foams to increase their chemical affinity with the zeolite. The thermal conductivity of graphite foams was evaluated by a “guarded hot plate” method. A comparison with aluminum foams of equivalent porosity showed that graphite foams perform similar or even better. In particular, the thermal conductivity of a graphite foam of 85% porosity was 24 W/m K. After the zeolite deposition process the thermal conductivity of the graphite composites was unchanged. Water adsorption measurements conducted on the coated foams by a McBain test unit confirmed the behavior observed for the pure SAPO-34, showing that interphase interactions between zeolite and support surface had no negative influence on the crystal growth process.
ISSN:1359-4311
DOI:10.1016/j.applthermaleng.2013.04.053