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每周分享：Oxygen permeability and structure stability of a novel cobalt-free perovskite Gd0.33Ba0.67FeO3?δ

今天給大家分享的是2014年5月份 《Journal of Membrane Science》上發表的一篇名為：Oxygen permeability and structure stability of a novel cobalt-free perovskite Gd0.33Ba0.67FeO3?δ

文章摘要如下：

A novel cobalt-free perovskite oxide based on Gd0.33Ba0.67FeO3?δ (GBF) was successfully prepared through a complexing method. X-ray diffraction (XRD) results reveal that the GBF possesses good structure and phase reversibility under low oxygen partial pressures and reducing atmosphere. The GBF membrane was steadily operated for 400 h using He as the sweep gas. The oxygen fluxes are 0.40, 0.34 and 0.29 ml/(cm2 min) for the membrane at 975, 950 and 925 °C, respectively. The reactor constructing by the GBF membrane was used for the partial oxidation of methane (POM) to syngas. The GBF membrane reactor for the POM was successfully operated for 428 h at 950 °C. The CH4 conversion of 94% and the CO selectivity of 95% with the oxygen flux of 5.6 ml/(cm2 min) are obtained. XRD, scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDX) characterizations indicate that the GBF membrane exhibits good phase structure stability for the membrane even after long-term operation under syngas production conditions.

該文章中材料表征采用的是美國麥克儀器AutoChem 2920

詳情可參考下面鏈接：

http://www.sciencedirect.com/science/article/pii/S0376738814000593