New progress in the study of high efficiency hydrogen separation with mixed conducting oxygen permeable membrane

Recently, Yang Weishen and Zhu Xuefeng, researchers of inorganic membrane and catalytic new materials group of State Key Laboratory of catalytic foundation, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, proposed a new method of efficient hydrogen separation in a mixed conductor oxygen permeable membrane reactor The relevant research results were published in energy energy energy SCI Doi: 10.1039/c6ee02967a The separation and purification technology of hydrogen is very important for the successful application of hydrogen in various fields In membrane separation technology, inorganic dense hydrogen permeation membrane is considered to be one of the most promising methods to obtain high purity hydrogen because of its 100% selective permeability to hydrogen However, the existing inorganic dense hydrogen permeation membrane has many problems, such as rare and expensive raw materials (Pd membrane), low permeability (proton conductor membrane), poor permeability stability in the atmosphere containing H 2S, etc The research team first proposed a new concept of hydrogen separation in a ceramic based mixed conductor oxygen permeable membrane reactor The principle of hydrogen separation is that one side of the membrane (side I) is filled with low purity hydrogen and the other side (side 2) Through the introduction of water vapor, high-temperature water combines with electrons and decomposes into hydrogen and oxygen ions Driven by the oxidation potential gradient on both sides of the membrane, oxygen ions react with low-purity hydrogen to generate water High purity or ultrapure hydrogen can be obtained by condensing and drying the gas from the side II of the membrane As a whole, low purity hydrogen is introduced into one side of the membrane reactor, while high purity hydrogen is obtained on the other side, and no net chemical reaction occurs, thus realizing the hydrogen separation process by the membrane The experimental results show that the hydrogen separation rate is as high as 16.3ml · cm - 2 · min - 1, and the separation coefficient is over 10000; the hydrogen separation rate is comparable to that of palladium based metal membrane, which is 2-3 orders of magnitude higher than that of proton conductor membrane, and can run stably for a long time in the atmosphere containing 200ppm H2S Therefore, oxygen permeable membrane can provide high purity hydrogen or ultra-high purity hydrogen for fuel cell, semiconductor manufacturing, photovoltaic cell production and other industries efficiently.