摘要
为进一步提高催化剂活性,用Ce对LaCoO3载体进行改性,并采用溶胶-凝胶法制备系列LaCo1-xCexO3（x=0-0.5）载体。其中,x=0.1和0.2时,载体为钙钛矿结构。采用沉积-沉淀法制备Au/LaCo1-xCexO3（x=0.1、0.2）催化剂,通过XRD、BET和H2-TPR等方法对催化剂进行催化活性评价及稳定性表征测试。结果表明,Au/LaCo0.9Ce0.1O3和Au/LaCo0.8Ce0.2O3催化剂能够在90℃将CO完全转化,在此温度进行的连续20h和30h的寿命实验中,CO转化率保持100%,催化活性和稳定性均优于Au/LaCoO3催化剂。表明掺杂Ce改性载体,能够提高催化剂活性和稳定性。
Ih order to improve the catalytic performahce of the catalysts,Ce was used to modify LaCoO3 support,ahd a series of LaCo1-xCexO3（x=0 -0. 5）supports was prepared by sol-gel method. Amohg LaCo1-xCexO3 supports,the perovskite structure was obtaihed wheh x=0. 1 ahd 0. 2. Au/LaCo1-xCexO3 （ x=0 . 1 ahd 0 . 2 ） catalysts were prepared by depositioh-precipitatioh method ahd characterized by meahs of XRD,BET ahd H2-TPR. The catalytic performahce of the catalysts for CO 1ow-temperature oxidatioh ahd their stability were ihvestigated. The results showed that CO cohversioh of l00% over Au/LaCo0. 9 Ce0. 1 O3 ahd Au/LaCo0. 8 Ce0. 2 O3 catalysts could still be maihtaihed durihg 20 h ahd 30 h cohsecu-tive reactioh at reactioh temperature 90℃. Au/LaCo0. 9 Ce0. l O3 ahd Au/LaCo0. 8 Ce0. 2 O3 catalysts exhibited higher catalytic activity ahd stability thah Au/LaCoO3 catalyst,which ihdicated that the dopihg of Ce to modify the support with perovskite structure could ehhahced the activity ahd stability of the catalyst.
出处
《工业催化》
CAS
2015年第3期204-207,共4页
Industrial Catalysis
