铜锌掺杂的六铝酸盐分解N_2O催化性能研究  

N_2O decomposition over Cu and Zn doped hexaaluminate catalysts

作　　者：宋永吉[1] 李翠清[1] 王虹[1] 董留涛[1,2] 

机构地区：[1]北京石油化工学院,北京102617 [2]北京化工大学,北京100029

出　　处：《工业催化》2008年第10期172-175,共4页Industrial Catalysis

基　　金：国家自然科学基金资助项目(20476012;20676017);北京市属;市管高校人才强教计划资助项目(BJJWR20051102)

摘　　要：采用共沉淀法制备了Cu和Zn取代六铝酸盐(LaCuxZn1-xAl11O19-δ,x=0、0.2、0.4、0.5、0.6、0.8、1.0)催化剂,通过XRD和BET等技术对催化剂进行表征,利用微型固定床反应器考察催化剂对N2O的分解活性。结果表明,以(NH4)2CO3为沉淀剂制备的催化剂在1 200℃焙烧4 h,可以形成完整的六铝酸盐晶型,Cu和Zn能够取代Al3+进入六铝酸盐晶体结构。LaCuxZn1-xAl11O19-δ催化剂对N2O分解有较好的催化活性,其中,LaCu0.8Zn0.2Al11O19-δ活性较好。在LaCuxZn1-xAl11O19-δ六铝酸盐中,Cu为N2O催化分解的主要活性元素,Zn有助于提高催化剂的稳定性,但由于六铝酸盐的特殊结构,Zn在催化剂中的作用较小。Gu, Zn doped hexaaluminates （ LaCuxZn1-x All1 O19-δ, x = 0, 0.2, 0.4, 0.5, 0.6, 0.8, 1.0） were prepared by co-precipitation method and tested for catalytic decomposition of N2O in a miniature fixed bed reactor. Their structure and physicochemical properties were characterized by means of XRD and BET. The results showed that the catalyst prepared using （NH4）2CO3 as precipitation agent had good hexaaluminate phase after calcinations at 1 200 % for 4 h. Cu and Zn were incorporated into the hexaaluminate lattice via good synergic effect. LaCu0.8 Zn0.2 Al11 O19 - δ exhibited better catalytic activity for N2O decomposition, with Cu as the active component and Zn as the stabilizing component. Zn had little effect on the catalyst activity due to inherent stability of hexaaluminates.

关 键 词：催化化学 N2O分解 六铝酸盐 共沉淀法 

分 类 号：O643.36[理学—物理化学] X701[理学—化学]