乙醇水汽重整制氢反应中钯铜合金膜的透氢性能

 采用真空化学镀技术制备了厚度较薄的具有 fcc 结构的 Pd0.9Cu0.1/Al2O3 合金复合膜, 在 250~500 °C, 160~310 kPa 的乙醇水汽重整制氢模拟反应条件下, 考察了不同醇/水比的 H2-Ar-C2H5OH-H2O 混合气体系中该膜的透氢性能. 结果表明, 乙醇和水的存在均相同程度地降低了膜的透氢性能, 但测试条件下 Pd-Cu 合金膜仍保持完整的膜致密性和稳定的相结构. 在 500 °C, 310 kPa, H2-Ar-C2H5OH-H2O (H2:Ar:(C2H5OH+H2O) 体积比为 60:30:10) 混合气中, 膜的最大透氢量为 11.3 m3/(m2?h), H2 回收率大于 62.5%. Pd-Cu 合金膜在乙醇水汽重整制氢反应中具有潜在的应用前景.

Hydrogen Permeation in a Thin Pd-Cu Alloy Membrane Reactor for Steam Reforming of Ethanol

Hydrogen permeation through a thin fcc-Pd0.9Cu0.1 alloy composite membrane was investigated with H2-Ar-C2H5OH- H2O mixtures for this modeling reaction over a range of temperature (250–500 °C) and pressure (160–310 kPa). The influence of temperature, feed pressure, feed flow rate, ratio of ethanol to steam, and hydrogen concentration of feed was examined under the operating conditions. Ethanol has inhibitive effect on hydrogen permeation performance through the membrane in comparison with that in pure hydrogen atmosphere. Moreover, hydrogen flux increased with increasing total mixture pressure and hydrogen concentration in the mixture feed but was not related to the ratio of ethanol to steam. Thus, the inhibitive influence of ethanol on hydrogen permeation was similar to that of steam under the same operating conditions. Although ethanol and steam can decrease hydrogen permeation, the hydrogen flux of membrane up to 11.3 m3/(m2•h) and hydrogen recovery over 62.5% were obtained in H2-Ar-C2H5OH-H2O (H2:Ar:(C2H5OH + H2O) volume ratio = 60:30:10) mixtures at 500 °C and 310 kPa. The membrane was stable without poisoning under ethanol-containing mixtures and would be suitable for the catalytic membrane reactor of steam reforming of ethanol to pure hydrogen production.