CeO_2-SiO_2复合氧化物的制备表征及其负载Pd催化活性的研究  

Preparation and Characterization of CeO_2-SiO_2 Mixed Oxide and Catalytic Activity Study of its Supported Pd Catalyst

作　　者：王永钊 赵永祥[1] 刘滇生[1] 

机构地区：[1]山西大学现代化学研究所,山西太原030006

出　　处：《中国稀土学报》2003年第z2期52-54,共3页Journal of the Chinese Society of Rare Earths

基　　金：山西省科技攻关项目(031099)

摘　　要：以硝酸铈和正硅酸乙酯为原料,采用溶胶凝胶超临界流体干燥法制备了不同CeO2含量的一系列复合氧化物。利用物理吸附仪,XRD,IR等手段对复合氧化物的织构和结构进行了表征,结果表明:采用该法可制备高比表面积的CeO2 SiO2复合氧化物,随着CeO2含量的增加,复合氧化物的比表面积逐渐降低;CeO2的结晶逐渐完善。最后对5CS复合氧化物负载Pd的催化活性进行了初步研究,发现其具有CO低温氧化活性。Using Ce(NO_3)_2·6H_2O and tetraethyl orthosilicate(TEOS) as staring materials, a series of CeO_2-SiO_2 mixed carriers with different CeO_2 has been prepared by the sol-gel-SCFD method. The properties and structures of the samples are characterized by BET, TEM and XRD. The results show that the CeO_2-SiO_2 mixed carriers prepared by the method ahve high surface area. With the increase of CeO_2 content, the surface area increases and the crystal of the CeO_2 grows up gradually. The study of complete oxidation of carbon monoxide indicates that CeO_2-SiO_2 with 5% CeO_2 supported Pd gets high catalytic activity.

关 键 词：溶胶-凝胶 超临界流体干燥 CeO2-SiO2复合氧化物 稀土 

分 类 号：O643.3[理学—物理化学]