中文摘要：

以磷石膏（PG）为活性组分,膨润土（Ben）为惰性载体,用机械混合法制备PG-Ben载氧体,为了提高其反应活性,用机械混合-浸渍法分别制备Fe_2O_3、CuO、NiO修饰PG-Ben的Fe-PG-Ben、Cu-PG-Ben、Ni-PG-Ben载氧体;利用X射线衍射、N2吸附-脱附等手段对其进行表征,并在流化床反应器中考察其煤化学链燃烧反应性能。结果表明：PG-Ben载氧体浸渍Ni、Cu、Fe后载氧体的反应活性显著提高,且NiPG-Ben载氧体性能最好,Ni-PG-Ben载氧体的反应性能随着Ni浸渍量的增加而提高;12次循环以内,CO_2干基体积分数保持在80%以上,Ni-PG-Ben载氧体对应的碳转化速率由第1次的0.114 min^-1减小到第15次的0.077 min^-1;Ni-PG-Ben载氧体反应活性降低由生成不具备催化作用的CaNiSi_4O_（10）以及载氧体表面具有煤催化气化作用的Ni元素流失所致。

英文摘要：

Through mechanical-mixing method, the oxygen carriers were prepared with phosphor gypsum（PG） as an active component and bentonite（Ben） as an inert support. In order to improve their reactivity, PG-Ben oxygen carriers decorated with Ni,Cu,Fe were prepared by mechanical mixing-impregnation method. The physical and chemical properties of these oxygen carriers were characterized by X ray diffraction and N_2 absorption-desorption measurements. The reactivity of these oxygen carriers in coal chemical looping combustion was performed in a fluidized bed reactor. The results show that the reactivity of the decorated oxygen carriers is improved as its surface area increases and Ni-PG-Ben oxygen carriers exhibit better performance than the others. The reactivity of NiPG-Ben oxygen carriers is enhanced by the increase of impregnation increment. The volume fraction of CO_2 is above 80% in 12 cycles. The carbon conversion rate decreases from 0.114 min~（-1） in the first redox test to 0.077 min~（-1） in the fifteenth redox test. The performance of Ni-PG-Ben oxygen carrier decreases because of the generated CaNiSi_4O_（10） which does not have catalysis effect and the loss of Ni which can catalyze the process of coal gasification.