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Two types of natural graphite host matrix for composite activated carbon adsorbents

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Wang, L. W., Metcalf, Steven J., Critoph, Robert E., Tamainot-Telto, Zacharie and Thorpe, Roger (2013) Two types of natural graphite host matrix for composite activated carbon adsorbents. Applied Thermal Engineering, Vol.50 (No.2). pp. 1652-1657. doi:10.1016/j.applthermaleng.2011.07.011 ISSN 1359-4311.

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Official URL: http://dx.doi.org/10.1016/j.applthermaleng.2011.07...

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Abstract

Two types of host for activated carbon (AC) adsorbents intended for use in compressed systems are studied: expanded natural graphite (ENG) and expanded natural graphite treated with acid (ENG-TA). Results show that compressed ENG-TA has much higher thermal conductivity than the compressed ENG. For a density of 830 kg/m3 the thermal conductivity of compressed ENG-TA is 336 W/(mK), and it is of the order of one hundred times higher compared with compressed ENG having similar density. The permeability of compressed ENG-TA is much more critical than the compressed ENG. For example for similar density of 300 kg/m3, the permeability of compressed ENG-TA is 2.01 × 10−15 m2 while the permeability of compressed ENG is 1.07 × 10−13 m2. Compressed composite adsorbents of AC with ENG as host were produced with a high density in the range 700–720 kg/m3. Considering that the permeability will be too low using composite AC with ENG-TA as host in high density, the density range was restricted to less than 500 kg/m3. The thermal conductivity of AC/ENG-TA composite is much higher than the thermal conductivity of AC/ENG composite, and it is about 7 times higher than the optimal value of AC/ENG composite.

Item Type: Journal Article
Divisions: Faculty of Science, Engineering and Medicine > Engineering > Engineering
Journal or Publication Title: Applied Thermal Engineering
Publisher: Pergamon
ISSN: 1359-4311
Official Date: February 2013
Dates:
DateEvent
February 2013Published
Volume: Vol.50
Number: No.2
Page Range: pp. 1652-1657
DOI: 10.1016/j.applthermaleng.2011.07.011
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Description:

Combined Special Issues: ECP 2011 and IMPRES 2010

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