A series of La_5.5W_1-xCr_xO_11.25-δ (LWCr_x, x = 0.1, 0.2, 0.3 and 0.4) powders were successfully synthesized by a traditional solid-state reaction method. The influences of Cr doping on phase structure, microstructure, hydrogen permeation and chemical stability of lanthanum tungstate were investigated in details. The oxygen vacancy concentration in LWCr_0.2 was higher than the other three samples. Moreover, the hydrogen permeation fluxes through LWCr_x membranes increased with the increase of Cr content when x ≤ 0.2, and LWCr_0.2 exhibited the highest hydrogen permeation flux because of its higher oxygen vacancy concentration. Besides, the hydrogen permeation fluxes through LWCr_0.2 membrane were comparable to that through La_5.5W_0.8Mo_0.2O_11.25-δ (LWMo_0.2) membrane. During a 104 h of hydrogen permeation test, the hydrogen permeation flux and phase structure changed slightly, revealing a good stability of LWCr_0.2 membrane.

一系列的La _5.5 w ^ _1-x的Cr _X ö _11.25-δ（LWCr _X，X = 0.1，0.2，0.3和0.4）的粉末通过一个传统的固态反应方法成功地合成。详细研究了Cr掺杂对钨酸镧相结构，微观结构，氢渗透和化学稳定性的影响。LWCr _0.2中的氧空位浓度高于其他三个样品。此外，当x≤0.2和LWCr _0.2时，通过LWCr _x膜的氢渗透通量随Cr含量的增加而增加。由于其较高的氧空位浓度，因此具有最高的氢渗透通量。此外，通过LWCr氢透过通量_0.2膜比得上通过拉_5.5 w ^ _0.8沫_0.2 ø _11.25-δ（LWMo _0.2）膜。在104 h的氢渗透测试中，氢渗透通量和相结构略有变化，表明LWCr _0.2膜具有良好的稳定性。