Hydrogen Permeation Performance and Hydrothermal Stability for Sol-gel Derived Pd-doped Silica Membranes

Kanezashi Masakoto, Shimada Chie, Sano Mitsunori, Yoshioka Tomohisa, Tsuru Toshinori

doi:10.1252/kakoronbunshu.36.472

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Other Title

ゾル‐ゲル法によるＰｄドープシリカ膜の開発と水素透過特性・耐水蒸気性の評価
ゾル-ゲル法によるPdドープシリカ膜の開発と水素透過特性・耐水蒸気性の評価
ゾルゲルホウニヨル Pd ドープシリカマクノカイハツトスイソトウカトクセイタイスイジョウキセイノヒョウカ

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Description

A sol–gel method was applied for the preparation of palladium-doped silica membranes for hydrogen separation. Hydrogen permeation performance and stability (thermal, hydrothermal) were evaluated by measuring the time and temperature dependence of gas permeances (N₂, H₂, He) in N₂ and steam atmospheres (steam: 70 kPa) at 500°C, respectively. It was found that the Pd-doped silica layer has a thickness of approximately 80 nm, and Pd particles of several nanometers were well dispersed in an amorphous silica matrix. Pd-doped silica membranes (Si/Pd=3/1) fired at 550°C in air were quite stable in N₂ atmosphere at 500°C, but a drastic decrease of gas permeances (He, H₂, N₂) and an increase of activation energy of gas permeation (He, H₂) were observed under H₂ atmosphere at 500°C due to aggregation of Pd particles. Pd-doped silica membranes (Si/Pd=3/1) fired at 550°C in H₂ showed high stability in hydrogen and steam atmospheres (steam: 70 kPa) at 500°C. This is because well-dispersed Pd particles in amorphous silica networks could not move in hydrogen and steam atmospheres.

Journal

KAGAKU KOGAKU RONBUNSHU

KAGAKU KOGAKU RONBUNSHU 36 (5), 472-479, 2010

The Society of Chemical Engineers, Japan

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