LixK2-xTi2O5(x = 0. 125,0. 15,0. 2) samples were synthesized by solid-phase method using TiO2 ,KNO3and LiOH · H2O as raw materials. The prepared catalysts were characterized by XRD,and their catalytic activities of soot oxidation were evaluated using TPR system under various conditions. Results showed that the structure of Lix K2-x Ti2 O5 doped with a little Li+was basically the same as K2Ti2O5; Li0.15K1.85Ti2O5 exhibited the highest catalytic activity among the three Lix K2-x Ti2 O5samples, its ignition temperature of soot was 210 ℃ and the peak temperature was 290 ℃. Furthermore,its catalytic activity of soot oxidation was significantly higher than some conventional noble metal catalyst (such as Pt-ZSM5),transition metal catalyst (such as Co,Ba,K/ZrO2) and others. Besides,its catalytic activity is higher under catalyst and soot in packed condition than in loose condition.%以TiO2、KNO3和LiOH·H2O为原料,采用固相法制备出不同Li+掺杂量的LixK2-xTi2O5(x=0.125,0.15,0.20)催化剂.利用XRD对催化剂结构进行表征,并通过程序升温反应研究其在不同条件下氧化炭黑颗粒的催化活性.结果表明:少量Li+掺杂的LixK2-xTi2O5的结构与K2Ti2 O5基本一致；Li0.15K1.85 Ti2 O5在上述Lix K2-xTi2O5系列催化剂中催化活性最高,炭黑起燃温度210℃,峰值温度290℃,比传统贵金属(如Pt-ZSM5)、过渡金属(如Co,Ba,K/ZrO2)类等催化剂性能有明显提高；催化剂和炭黑在紧密接触方式下比松散接触方式下的催化活性高.
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