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 language | English |
|---|---|
| Pages (from-to) | 1549-1553 |
| Number of pages | 5 |
| Journal | Materials Research Bulletin |
| Volume | 45 |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - Nov 2010 |
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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 journal › Article
}
TY - JOUR
T1 - Water vapor adsorption of CaCl2-impregnated activated carbon
AU - Okada, Kiyoshi
AU - Nakanome, Mari
AU - Kameshima, Yoshikazu
AU - Isobe, Toshihiro
AU - Nakajima, Akira
PY - 2010/11
Y1 - 2010/11
N2 - 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.
AB - 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.
KW - A. Amorphous materials
KW - A. Microporous materials
KW - D. Surface properties
UR - http://www.scopus.com/inward/record.url?scp=77957319101&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77957319101&partnerID=8YFLogxK
U2 - 10.1016/j.materresbull.2010.07.027
DO - 10.1016/j.materresbull.2010.07.027
M3 - Article
AN - SCOPUS:77957319101
VL - 45
SP - 1549
EP - 1553
JO - Materials Research Bulletin
JF - Materials Research Bulletin
SN - 0025-5408
IS - 11
ER -