Cu/Co/Fe水滑石衍生的复合氧化物催化高氯酸铵热分解的研究

摘要

Cu/Co/Fe mixed oxides (Cu/Co/Fe-MOs) were prepared by calcining the precursors of Cu/Co/Fe layered double hydroxides (Cu/Co/Fe-LDHs),and were used as new catalysts for the thermal decomposition of ammonium perchlorate (AP).The catalytic activity was investigated using differential thermal analysis (DTA) and thermal gravimetric analyzer coupled with an online mass spectrometer (TG-MS).The results reveal that Cu/Co/Fe-MOs exhibit CuFe2O4 and (CoFe2)O4 phase with high specific surface area of 70～110 m2·g-1.The Cu/Co/Fe-MOs have homogenous particles with crystallite size of 20～30 nm.The thermal decomposition temperature of AP can be lowered by 139 ℃ with 4wt％ of Cu/Co/Fe-MOs calcined at 400 ℃.The improvement in thermal decomposition of AP by Cu/Co/Fe-MOs catalysts is achieved via the superoxide ion (O2-) adsorbed on the surface of Cu/Co/Fe-MOs.%以Cu/Co/Fe水滑石(Cu/Co/Fe-LDHs)为前驱体经过焙烧制备了Cu/Co/Fe复合氧化物(Cu/Co/Fe-MOs).利用DTA和TG-MS研究了Cu/Co/Fe-MOs作为新型催化剂对高氯酸铵热分解的催化性能.结果表明,Cu/Co/Fe-MOs呈现为CuFe2O4和(CoFe2)O4晶相,具有70～110 m2·g-1的比表面积.晶粒大小均匀,尺寸在20～30 nm.添加4wt％的400℃焙烧得到的Cu/Co/Fe-MOs催化剂使高氯酸铵热分解反应的温度降低了139℃.Cu/Co/Fe-MOs是通过吸附在金属氧化物表面的超氧离子(O2-)来加速高氯酸铵热分解的.