期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 147, 期 -, 页码 406-413出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.seppur.2015.01.039
关键词
Perovskite oxide; Ceramic hollow fibre; Ceramic membranes; Membrane reactor
资金
- National Natural Science Foundation of China (NNSFC) [21176187, 21176146, 21476131]
- Doctoral Program of Higher Education of China [RFDP 20131201110007]
- Australian Research Council [DP0985578]
Perovskite membranes have the potentials to be applied in a novel cost-effective technology for air separation or gas reactions. For this purpose, a cobalt free ceramic perovskite of La0.3Sr0.7Fe0.7Cu0.2Mo0.1O3 (LSFCM) with homogeneous composition was synthesized via the low temperature combustion process. LSFCM perovskite hollow fibre membranes were fabricated by the phase inversion/sintering technique using the prepared ceramic powder. The stability and the catalytic activity of the LSFCM ceramic powder and the prepared membrane reactor for the partial oxidation of methane into syngas were investigated. The oxygen permeation properties of the LSFCM membranes were also studied under the sweep gas mode. Under the oxygen concentration gradient created by air/sweep gas, the detected oxygen flux was 2.31 mL/min/cm(2) at 1000 degrees C with sweep gas rate of 40 mL/min. The experimental results indicate that the LSFCM ceramic powders and hollow fibre membrane exhibited good stability when exposed in inert gases like He and air, but they were not very stable for long run operation in reducing or acid gases like H-2, CH4, and CO2. The LSFCM ceramic powder exhibited excellent catalytic activity in the partial oxidation of methane for syngas production with the maximum selectivities of CO and H-2 both above 90%. In contrast, the prepared blank LSFCM ceramic hollow fibre membrane displayed good selectivity towards the C-2 products of ethylene and ethane with best C-2 yield up to 19% raising an interesting issue of the effects of catalyst geometry on its catalytic activity, which deserves further investigation. (C) 2015 Elsevier B.V. All rights reserved.
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