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Novel Ba_(0.5)Sr_(0.5)Fe_(0.8)Zn_(0.2)O_(3-δ) membranes for POM

Chinese Chemical Letters 2009年第2期20卷 250-252,F0003页

作者： Hui Xia Luo Ling Hui Yu Xin Zhi Chen Hai Hui Wang jtirgen caro The Key Lab of Enhanced Heat Transfer and Energy Conservation of Chinese Ministry of Education School of Chemistry & Chemical Engineering South China University of Technology Guangztwu 510640 China Institute of Physical Chemistry and Electrochemistry Leibniz University Hannover Callinstr. 3-34 D-30179 Hannover Germany

A novel cobalt-free perovskite based on Ba0.5Sr0.5Fe0.8Zn0.2O3-δ （BSFZ） were prepared by EDTA-citric acid method. The lattice constants of the BSFZ perovskite were characterized by in situ high-temperature X-ray diffraction （HTXRD）. The thermal expansion coefficient of BSFZ is 10.5×10^-6 K^-1, which is lower than that of cobalt-based perovskite materials. The BSFZ membrane was also used to construct reactors for the partial oxidation of methane （POM） to syngas. Results show that the BSFZ membrane can be operated for the POM reaction for more than 100 h without any fractures. The CO selectivity of 97% is obtained. The steady oxygen permeation flux reaches around 2.5 mL/min cm^2 during POM reaction.

关键词： Membrane Oxygen separation Mixed conductor Perovskite POM

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Preparation and hydrogen permeation properties of BaCe_(0.95)Nd_(0.05)O_(3-δ) membranes

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Chinese Chemical Letters 2008年第10期19卷 1256-1259页

作者： Ming Ya Cai Hui Xia Luo Zhong Li Armin Feldhoff jtirgen caro Hai Hui Wang The Key Lab of Enhanced Heat Transfer and Energy Conservation of Chinese Ministry of Education School of Chemistry Engineering South China University of Technology Wushan Road Guangzhou 510640 China Institute of Physical Chemistry and Electrochemistry Leibniz University Hannover Callinstr. 3-3A D-30179 Hannover Received 31 March 2008 ＆ Chemical Germany

Dense mixed proton and electron conducting membrane made of BaCe0.95Nd0.05O3-δ （BCNd5） was prepared by pressing followed by sintering. X-ray diffraction （XRD） was used to characterize the phase structure of both the powder and the sintered membranes. The microstructure of the sintered membranes was studied by scanning electron microscopy （SEM）. Hydrogen permeation through the BCNd5 membrane was studied using a high temperature permeator. The hydrogen permeation fluxes under wet conditions are higher than those under dry conditions, which is due to H^＋ hopping via surface OH groups. At 925℃, a hydrogen permeation flux of 0.02 mL/min cm^2 was obtained under wet condition, which recommends BCNd5 as a potential material for hydrogen-selective membranes.

关键词： Hydrogen Mixed conductor Perovskite Membrane

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