Abstract
采用机械球磨（NaH/Al＋Ti）和（NaH/Al＋Ti-Zr）复合物的方法加氢制备了NaAlH4配位氢化物,系统研究了Ti、Ti-Zr催化剂以及不同加氢条件对其可逆储氢行为的影响.结果表明,对于NaH/Al体系的吸放氢性能,共掺金属Ti粉/Zr粉的催化作用比单独掺金属Ti粉的催化作用要好.随着加氢温度从85℃上升到140℃,体系的吸氢容量先增后减,并在120℃时达到最大值;同时,发现共掺Ti-Zr催化剂的复合物具有最佳的储氢性能,在120和85℃时的吸氢量分别为4.61%和3.52%（w）,比仅掺Ti催化剂的复合物分别高出0.40%和0.70%（w）的吸氢量.随着加氢压力的增大,（NaH/Al＋Ti-Zr）复合物的吸氢性能随之提高.XRD和DSC分析结果表明,NaAlH4体系的放氢过程明显发生两步分解反应,共掺Ti-Zr催化剂的复合物储氢性能优于单独掺Ti催化剂的原因是,共掺催化剂能有效改善NaAlH4体系吸放氢反应的动力学性能,并降低体系的放氢温度.
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