采用PdCl2溶液浸渍--焙烧--还原的方法制备出载钯硅藻土(Palladium/Kieselguhr, 简称Pd/K), 对其进行物相分析、形貌观察、吸放氢PCT以及吸氢动力学测量, 研究了1000次和2000次热致吸放氢循环后的储氢性能。结果表明, 热致循环前后Pd/K的吸放氢PCT曲线基本相同, 吸氢量稍有降低, 动力学性能明显提高。热致循环后Pd/K表面的钯颗粒发生明显粉化, 1000次和2000次热致循环后粉化率(<150 μm)分别为0.21%和3.98%。
A palladium–kieselguhr composite (Pd/K) was prepared by the PdCl2 dipping–calcinating–reducing method. Hydrogen storage performances of the Pd/K before and after subjecting to 1000 and 2000 cycles of hydriding–dehydriding test using the TCAP method were investigated, including phase analysis, morphology observation, pressure–composition isotherm (P − C − T curve) and hydrogen absorption kinetics of the Pd/K composite. Comparing to the initial status, it was found that the absorption rate of the thermally cycled Pd/K greatly enhanced, the P − C − T curve almost retained the same, while the hydrogen uptake capacity decreased slightly. Pulverization of the palladium particles was found on the thermally cycled Pd/K, and the pulverization rates of the Pd/K after 1000 and 2000 cycles were 0.21% and 3.98%, respectively.
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