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Water vapor sorption characteristics of calcium chloride-anodized alumina composites.

Number: pap. n. 74

Author(s) : SUWA Y., KUMITA M., OTANI Y.

Summary

In the present paper, calcium chloride-anodized alumina composites were investigated for water vapor sorption properties. Aluminum plates were anodized in a sulfuric acid bath or an oxalic acid bath to form porous aluminum oxide films on the surfaces. The anodized oxide films were impregnated with CaCl2, and then were calcinated at 473 or 773 K. The calcination temperature made an effect on crystal states of calcium chloride hydrates in the composite layer. The calcination at 773 K resulted in increased amorphous salt formation in the alumina film. The composite calcinated at 473 K, where the oxalic-acid anodized alumina was used as a host matrix, contained calcium chloride hydrates. Water sorption experiments showed that the composite with crystalline calcium chloride hydrates sorbed well water vapor, and its sorption isotherm had a shape similar to that of the bulk CaCl2. Therefore, the water sorption behavior of the CaCl2-alumina composite strongly depends on crystal states of calcium chloride hydrates in the alumina pores.

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Pages: 8 p.

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Details

  • Original title: Water vapor sorption characteristics of calcium chloride-anodized alumina composites.
  • Record ID : 30014345
  • Languages: English
  • Source: International sorption heat pump conference (ISHPC2014), College Park, United States, March 31-April 2, 2014.
  • Publication date: 2014/03/02

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