MnOx/ZrO_2纳米催化剂的制备及对CO-SCR-NO性能研究  

Preparation of nanocatalysts MnO_x/ZrO_2 and properties of CO-SCR-NO

作　　者：李晓伟[1] 赵惠忠[1] 汪厚植[1] 罗浪里[2] 殷嗣杰[2] 

机构地区：[1]武汉科技大学高温陶瓷与耐火材料湖北省重点实验室,湖北武汉430081 [2]武汉科技大学纳米材料与技术中心,湖北武汉430081

出　　处：《真空》2005年第4期5-8,共4页Vacuum

基　　金：湖北省科技攻关计划重点项目(2001AA101B07);武汉市重大科技攻关计划项目(20011007088)

摘　　要：以氧氯化锆和硝酸锰为主要原料,采用So l-G e l-VFD技术制备了M nO x/Z rO2超细粉体材料。用XRD,TG-DSC,TEM和BET等技术对试样进行了表征,用微反应器-气相色谱仪在线研究了试样不同配合比例对试样催化还原NO的活性的影响。结果表明:用So l-G e l-VFD技术可制得粒子尺寸约为20 nm、具有高催化活性的负载型M nO x/Z rO2纳米催化剂,锰由低价向高价转变。添加了C e组分能提高M nO x/Z rO2纳米催化剂催化还原NO的活性。MnO_x/ZrO_2 ultra-fine powder was prepared by Sol-Gel-VFD(Vacuum freeze-drying) technique with ZrOCl_2 and Mn(NO_3)_2 taken as main raw materials. XRD, TEM, TG-DSC and BET were used to characterize the catalyst, and the effect of specimens with different proportioning on the activity of NO in its catalytic reduction reaction was on-line investigated using microreactor and gas chromatography. The results showed that the particle size of MnO_x/ZrO_2 powder obtained as a loadable high-performance catalyst is about 20 nm, of which the active Mn was transtormed from low valance to high valance. With Ce added to it, the activity of NO was improved in its catalytic reduction reaction by the nanocatalyst MnO_x/ZrO_2.

关 键 词：纳米催化剂 真空冷冻干燥 CO选择性催化还原NO 

分 类 号：O484[理学—固体物理]