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采用XRD,SEM,P-C T等方法研究了热处理温度(873~1473 K)对含Pd 45.3%(质量分数)的载钯硅藻土(Pd/K)复合材料微观形貌和储氢性能的影响。结构及微观形貌分析表明:Pd/K复合材料由Pd和SiO2两相组成,且相组成不随热处理温度的升高而变化;1123 K以下温度热处理时,Pd/K复合材料中细小的钯颗粒分布于硅藻土颗粒表面和孔隙内,同时,复合材料具有高的比表面积和孔容。随着热处理温度的升高,钯颗粒聚集长大形成网状膜,导致复合材料比表面积和孔容降低。储氢性能分析表明:1123 K以下低温热处理的Pd/K材料饱和吸氢容量低、压力平台斜率大,升高热处理温度可显著降低其吸氢平台斜率,减小吸放氢压力滞后,增大储氢容量。
The effects of heat treatment temperature (873 ~ 1473 K) on the morphology and hydrogen storage properties of Pd-K loaded Pd-K composite containing 45.3 wt% Pd were investigated by XRD, SEM and PCT methods. . The results show that Pd / K composites consist of two phases of Pd and SiO2, and the phase composition does not change with the increase of the heat treatment temperature. When the temperature is below 1123 K, the small Pd particles in the Pd / K composites Distributed in the surface of diatomite particles and pores, while the composite material has a high specific surface area and pore volume. With the increase of the heat treatment temperature, the palladium particles aggregated and grew up to form the reticular membrane, resulting in the reduction of the specific surface area and the pore volume of the composite. Hydrogen storage performance analysis shows that the Pd / K material with low temperature below 1123 K has low saturated hydrogen absorption capacity, large pressure platform slope and high heat treatment temperature, which can significantly reduce the slope of hydrogen absorption platform, decrease the hydrogen pressure lag and increase Hydrogen storage capacity.