TY - JOUR
T1 - Enhancement of ionic conductivity of aqueous solution by silanol groups over zeolite surface
AU - Hojo, Koichiro
AU - Takahashi, Tsukasa
AU - Oshima, Kazumasa
AU - Haji, Takamasa
AU - Terayama, Yuki
AU - Matsumoto, Hiroshige
AU - Satokawa, Shigeo
N1 - Funding Information:
This work was supported by CREST, Japan Science and Technology Agency ( JPMJCR1441 ). We are grateful to Prof. Shohei Tada, Ibaraki University, for his kind help for the measurement of the FT-IR.
Publisher Copyright:
© 2020 Elsevier Inc.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2021/1
Y1 - 2021/1
N2 - The ionic conduction of zeolite powder in ion-exchanged water and various other solutions was investigated. H-BEA-92.5, which contained many silanol groups, showed the highest conductivity of 1.1 × 10−1 S cm−1 at 95 °C in a 10,000 ppm NaCl aqueous solution. After controlling the amount of surface silanol groups by calcination or dealumination, zeolites with a relatively large number of surface silanol groups showed the highest conductivity in water. The improvement of conductivity with zeolite in water was also observed for zeolite-related materials with surface silanol groups. Therefore, we conclude that surface silanol groups play an important role in increasing the conductivity of solution with zeolite in water. Furthermore, it was revealed that the mechanism of conduction was similar to the Grötthuss mechanism because of its apparent activation energy.
AB - The ionic conduction of zeolite powder in ion-exchanged water and various other solutions was investigated. H-BEA-92.5, which contained many silanol groups, showed the highest conductivity of 1.1 × 10−1 S cm−1 at 95 °C in a 10,000 ppm NaCl aqueous solution. After controlling the amount of surface silanol groups by calcination or dealumination, zeolites with a relatively large number of surface silanol groups showed the highest conductivity in water. The improvement of conductivity with zeolite in water was also observed for zeolite-related materials with surface silanol groups. Therefore, we conclude that surface silanol groups play an important role in increasing the conductivity of solution with zeolite in water. Furthermore, it was revealed that the mechanism of conduction was similar to the Grötthuss mechanism because of its apparent activation energy.
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U2 - 10.1016/j.micromeso.2020.110743
DO - 10.1016/j.micromeso.2020.110743
M3 - Article
AN - SCOPUS:85095953726
VL - 312
JO - Zeolites
JF - Zeolites
SN - 1387-1811
M1 - 110743
ER -