Review on mechanisms of gas permeation through inorganic membranes
Review on mechanisms of gas permeation through inorganic membranes
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DOI：
10.1627/jpi.54.298
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发表时间：
2011-11
影响因子：
1
通讯作者：
S. Ted;Oyama;Mariko;Yamada;Takashi;Sugawara;Atsushi;Takagaki;Ryuji;Kikuchi
中科院分区：
文献类型：
--
作者：
S. Ted;Oyama;Mariko;Yamada;Takashi;Sugawara;Atsushi;Takagaki;Ryuji;Kikuchi
介绍了气体透过固体膜的主要机理，并给出了适用的渗透率方程。其机理取决于渗透分子的相对大小和孔的直径。随着孔径减小，可操作的机制是哈根-普伊塞尔流动、努森扩散、表面扩散、气体平移，最后是固态扩散。Hagen-Pouiselle机制涉及通过大孔的流动，而Knudsen机制涉及分子与中等尺寸孔壁的碰撞。表面扩散涉及被捕获在相对小尺寸的孔壁的势场中的分子的运动，而气体平移涉及可以逃离场但被小孔约束的分子。最后，固态传输包括溶解和通过固体内的扩散传输。这些机制说明了氢渗透与使用两个膜，氧化铝膜与中等大小的孔和致密结构的氧化铝膜上的二氧化硅。
The major mechanisms of gas permeation through solid membranes are described and the applicable equations describing the permeance are presented. The mechanisms depend on the relative size of the permeating molecules and the diameter of the pores. As pore size decreases the operable mechanisms are Hagen-Pouiselle flow, Knudsen diffusion, surface diffusion, gas-translation, and finally solid-state diffusion. The Hagen-Pouiselle mechanism involves flow through large pores, while the Knudsen mechanism involves collision of molecules with the walls of pores of intermediate size. Surface diffusion deals with movement of molecules trapped in the potential field of the walls of pores of relatively small size, while gas-translation involves molecules that can escape the field, but are constrained by the small pores. Finally, solid-state transport comprises dissolution and transport by diffusion within the solid. These mechanisms are illustrated for hydrogen permeance with the use of two membranes, an alumina membrane with intermediate sized pores and a silica on alumina membrane of dense structure.