摘要
二甲醚（DME）由于其清洁环保特性成为燃料电池电动汽车的理想氢源之一。在200-300℃温度范围，1．0×4．0×10^5Pa的压力范围内，Pd-Ag-Au-Ni合金膜对H2与Ar和N2的分离系数接近无穷大，同时，膜具有较好的透氢稳定性。通过实验研究了膜反应器中Ar、N2、CO、CO2、H2O和DME等气体存在时对钯银合金膜透氢性能的影响。实验结果表明，Ar、N2、DME基本对透氢性能无影响，CO2、CO、H2O存在时，会影响氢气的渗透性。三者当中，CO2的影响最小，混合气中H2O比CO对透氢性能的影响大，这是由于H2O在钯膜表面有更大的竞争吸附作用。本研究结果为更详细地研究二甲醚水蒸气重整制氨过程提供了重要参考依据。
The dimethyl ether steam reforming （DME SR） system, which is used to produce the hydrogen-rich gas for fuel cell feeding application, can be a promising fuel provider due to its property of being friendly to environment. The Pd-Ag-Au-Ni membrane is usually used in the DME SR system to separate and purify the hydrogen produced from DME SR. At the temperature range of 2O0-300℃ and pressure range of 1.0×10^5-4.0×10^5 Pa, the H2 permeation performances of the palladium-silver alloy membrane for gas mixture of hydrogen with ArE, N2, CO, CO2,.H2O and DME were investigated, respectively. The results show that the separation factors of palladium-silver alloy membrane for gas mixture of HjN2 and H2/Ar2 are nearly infinity, and the membrane shows good permeation stability. The co-existed Ar2, N2 and DME have negligible effect on hydrogen permeation through the investigated membrane, while the co-existed CO, CO2 and.H2O have negative influence of inhibiting the H2 permeation through the membrane, and between them, the co-existed CO has the smallest inhibitive effect on H2 permeation through the membrane, and the co-existed H2O has a larger inhibitive effect than CO; it is due to the competitive adsorption of H2O on the palladium metallic surface is stronger than hydrogen. The obtained H2 permeation performance data of the Pd-Ag-Au-Ni membrane could provide fundamental data for the design of DME SR system.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2010年第1期58-63,共6页
Journal of Chemical Engineering of Chinese Universities
关键词
氢能
膜反应器
渗透性
竞争吸附
二甲醚
hydrogen
membrane reactor
permeation
competitive adsorption
dimethyl ether
