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ID 46483
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title alternative
Estimation of Proton Mobility in HZSM-5 Type Zeolite Films by Complex Impedance Method <Note>
creator
Kurita, Satoru
Wang, Zhengbao
Kawakami, Yusuke
Uematsu, Kazuyoshi
Sato, Mineo
NDC
Chemistry
abstract
The delocalization of protons in HZSM-5 type zeolite films was investigated by the complex impedance method. The conductivities under various water vapor pressures were calculated from both the Cole-Cole plot analysis and the impedance at 1 kHz. The conductivity of HZSM-5 (Al) zeolite film with 170 of SiO2/Al2O3 ratio was strongly dependent on the water vapor pressure and increased with an increase inthe vapor pressure. On the other hand, the conductivities of the silicalite film (SiO2/Al2O3 ratio > 5000) and the pellet prepared by compressing the powdery HZSM-5 zeolite with 173 of SiO2/Al2O3 ratio hardly increased with the water vapor pressure. The conductivities of HZSM-5 type metallosilicates (HZSM-5 (Ga) and HZSM-5 (Fe)) films were also measured. From the results obtained, it was concluded that (1) the acidic sites associated with the framework aluminums are the active centers for the proton conductivity, (2) adsorbed water molecules are responsible for the conduction and (3) the polycrystalline zeolite film is very effective for estimation of proton mobility.
journal title
Journal of the Chemical Society of Japan : chemistry and industrial chemistry
volume
Volume 1997
issue
Issue 6
start page
456
end page
460
date of issued
1997-06-10
publisher
日本化学会
issn
0369-4577
ncid
publisher doi
language
jpn
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
publisher
rights
Copyright (c) 1997 The Chemical Society of Japan
relation url
department
Graduate School of Engineering