中文摘要：

采用溶液化学还原法制备钯载量分别为10％、20％、30％和40％（质量分数）的多壁碳纳米管载钯（Pd/MWCNTs）催化剂,然后与Mg粉混合成95Mg-mPd/（5-m）MWCNTs（m=0.5、1、1.5和2）,采用氢化燃烧合成法（HCS）制备镁基氢化物,最后机械球磨（MM） 10 h.采用X线衍射（XRD）、透射电子显微镜（TEM）、场发射扫描电子显微镜（FESEM）及气体反应控制器研究材料的相组成、微观形貌和吸放氢性能.结果表明：Pd/MWCNTs大幅提高HCS过程中Mg的氢化程度,在HCS过程中形成的MgPd合金明显提高复合材料的储氢性能.样品95Mg-2Pd/3MWCNTs在473 K下、100 s内,饱和吸氢量达到6.66％（质量分数）;在573 K下、1 800s内,放氢量高达6.25％（质量分数）;其放氢的表观活化能与市售MgH2相比,从153 k]/mol降低到80.8 kJ/mol.

英文摘要：

Multi-wall carbon nanotubes （MWCNTs） with different amounts of Pd （10％,20％,30％ and 40％） were synthesized by a solution reduction method.95Mg-mPd/（5-m） MWCNTs （m =0.5,1,1.5 and 2） were prepared by hydriding combustion synthesis （HCS） and mechanical milling （MM）.The phase compositions,surface morphologies and hydriding/dehydriding properties of the samples were examined by X-ray diffraction （XRD）,field emission scanning electron microscopy （FESEM）,transmission electron microscope （TEM）,and gas reaction controller.Results showed that Pd/MWCNTs could significantly increase the hydrogenation degree of magnesium during the HCS process.The MgPd alloy made the dehydrogenation process of MgH2 easier.The 95Mg-2Pd/3MWCNTs showed best hydriding/dehydriding properties,requiring only 100 s to reach its saturated hydrogen absorption capacity of 6.66％ at 473 K,and desorbing 6.25％ hydrogen within 1 800 s at 573 K.Additionally,the dehydrogenation activation energy of MgH2 in the system decreased from 153 kJ/mol to 80.8 kJ/mol.