Li_xK_(2-x)Ti_2O_5在净化柴油机尾气中炭黑颗粒的应用  

APPLICATION OF Li_xK_(2-x)Ti_2O_5 IN THE PURIFICATION OF SOOT FROM DIESEL EXHAUST

作　　者：殷光松[1] 段林海[1] 孟秀红[1] 宋丽娟[1] 

机构地区：[1]辽宁石油化工大学辽宁省石油化工催化科学及技术重点实验室,辽宁抚顺113001

出　　处：《石油炼制与化工》2012年第1期58-61,共4页Petroleum Processing and Petrochemicals

基　　金：辽宁省教育厅资助创新团队项目(2009T061)

摘　　要：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K2Ti2O5基本一致;Li0.15K1.85Ti2O5在上述LixK2-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。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 LixK2-xTi2O5 doped with a little Li＋ was basically the same as K2 Ti2 O5 ; Li0.15 K1. 85 Ti2O5 exhibited the highest catalytic activity among the three LixK2-xTi2O5 samples, 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.

关 键 词：LixK2-xTi2O5 柴油机尾气 炭黑颗粒 固相法 

分 类 号：O643.36[理学—物理化学]