多孔不锈钢表面的陶瓷修饰及所负载的透氢钯膜

Ceramic Modification of the Porous Stainless-Steel Surface Toward the Supported Palladium Membranes for Hydrogen Separation

多孔基体负载的钯膜具有优异的透氢性能,可作为氢气分离器应用于产氢、氢气回收、膜催化反应器等。近年来,以多孔不锈钢为基体的钯复合膜得到了快速的发展,该种膜组件具有更好的物理强度、易于密封和安装,因而具有更高的实用性。但多孔不锈钢一般不宜直接用作钯膜基体,需要进行陶瓷修饰。本文分别介绍了多孔不锈钢、陶瓷修饰层与钯膜三个组成部分,其中重点介绍了多孔不锈钢表面的陶瓷修饰这一关键技术环节。

The composite palladium membrane comprises a porous substrate and a thin layer of palladium or Pdalloy which is highly permeable for hydrogen. These membranes can be applied in production and recovery of hydrogen, and they can be also employed as membrane reactors which couple the reaction with separation together. In recent years, a great progress has been achieved in development of the palladium membranes based on porous stainless-steel substrates, which helps to ease the problems of membrane sealing and assembling, and therefore makes the membranes more feasible in industry. Since the porous stainless-steel in general is unsuitable to be employed directly as membrane substrate, its surface should be modified with a ceramic layer. This review introduces the stainless-steel materials, surface ceramic coating and the membrane layer, wherein the ceramic modification of the stainless-steel surface, as a key process in membrane development, is particularly elucidated in detail.