ZrO_2引入对Pd/Al_2O_3催化剂结构和性能的影响  

Effect of the Addition of ZrO_2 on the Structure and Property of Pd/Al_2O_3 Catalyst

作　　者：何湘鄂[1] 杨乐夫[1,2] 史春开[1] 胡昱翔[1] 蔡俊修[3,4] 

机构地区：[1]厦门大学化学系 [2]厦门大学固体表面物理化学国家重点实验室厦门361005 [3]厦门大学固体表面物理化学国家重点实验室 [4]厦门大学物理化学研究所,厦门361005

出　　处：《应用化学》2003年第10期924-927,共4页Chinese Journal of Applied Chemistry

基　　金：科技部"九七三"项目 (G19990 2 2 40 0 );国家自然科学基金资助项目 (2 0 2 0 30 14 )

摘　　要：采用共沉淀法制得不同摩尔比的ZrO2 和Al2 O3 复合载体 ,考察了负载型Pd/nZrO2 mAl2 O3 催化剂上CH4 的催化燃烧反应 ,当催化剂中n(ZrO2 )∶n(Al2 O3 ) =1∶5 8时催化活性最好。XRD结果显示 ,ZrO2 的引入量影响了催化剂的表面组成和结构 ,当催化剂中存在单斜相ZrO2 及催化剂成大孔径分布时催化剂活性较好。O2 TPD结果表明 ,适量ZrO2 引入 ,促使载体与贵金属的相互作用形成大量活性PdOx,提高了催化剂的CH4氧化能力。Palladium catalysts supported on mixed oxides(Pd/nZrO 2-mAl 2O 3) were prepared by copre cipitation and their activities have been examined in catalytic combustion reaction of methane. It was found that the catalyst with n∶m=1∶5.8 has the highest activity. XRD study revealed that introduction of ZrO 2 affects the surface composition and structure of the catalyst, and the catalyst has good activity when ZrO 2 is in monclinic phase and has gross porosity. O 2-TPD experiments indicated that an appropriate amount of ZrO 2 in the com- posite favors the interaction between carrier and noble metal, leading to the formation of a large amount of PdO x active species and increase of catalystic activity in CH 4 oxidation reaction.

关 键 词：PD催化剂 Zr/Al混合氧化物 甲烷 低温催化燃烧 

分 类 号：O643.66[理学—物理化学] O643.21[理学—化学]