Water vapor adsorption of CaCl2-impregnated activated carbon

Kiyoshi Okada, Mari Nakanome, Yoshikazu Kameshima, Toshihiro Isobe, Akira Nakajima

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Activated carbons (AC) impregnated with the hygroscopic salt CaCl 2 were synthesized to enhance the amount of water vapor adsorbed at low relative pressure (P/P0). Possible applications for these materials are in adsorption heat pumps and desiccant air conditioners. The ACs were synthesized from tissue paper by chemical activation with K 2CO3 and the porous properties were investigated of a number of materials prepared under a variety of activation conditions. The highest specific surface area (SBET) (1820 m2/g) was obtained from the sample prepared with a K2CO3/sample ratio = 1/1 by mass, activated at 900 °C for 2 h under flowing N2 (2 L/min). Impregnation with CaCl2 was performed using 2.4-6.5 M CaCl2 solutions and a solution volume equal to the pore volume of the AC. XPS surface chemical analysis revealed that the impregnated CaCl 2 was mostly successfully impregnated into the pores while the surface CaCl2 increased gradually with increasing amount of impregnation. The adsorption of water vapor in the P/P0 range 0.1-0.3 (ΔW0.1-0.3) was dramatically increased by CaCl2 impregnation, the ΔW0.1-0.3 value reaching 0.52 g/g in the sample impregnated with 70 mass% CaCl2; this value is much higher than previously reported ΔW0.1-0.3 values.

Original languageEnglish
Pages (from-to)1549-1553
Number of pages5
JournalMaterials Research Bulletin
Volume45
Issue number11
DOIs
Publication statusPublished - Nov 2010

Fingerprint

Steam
activated carbon
Impregnation
Activated carbon
Water vapor
water vapor
Adsorption
adsorption
Hygroscopic Agents
Chemical activation
desiccants
activation
porosity
heat pumps
chemical analysis
Specific surface area
alternating current
X ray photoelectron spectroscopy
Salts
Pumps

Keywords

  • A. Amorphous materials
  • A. Microporous materials
  • D. Surface properties

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering
  • Mechanics of Materials

Cite this

Water vapor adsorption of CaCl2-impregnated activated carbon. / Okada, Kiyoshi; Nakanome, Mari; Kameshima, Yoshikazu; Isobe, Toshihiro; Nakajima, Akira.

In: Materials Research Bulletin, Vol. 45, No. 11, 11.2010, p. 1549-1553.

Research output: Contribution to journalArticle

Okada, Kiyoshi ; Nakanome, Mari ; Kameshima, Yoshikazu ; Isobe, Toshihiro ; Nakajima, Akira. / Water vapor adsorption of CaCl2-impregnated activated carbon. In: Materials Research Bulletin. 2010 ; Vol. 45, No. 11. pp. 1549-1553.
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