CAJ | 학술논문

利用一步柠檬酸络合法合成了钙钛矿LaCo1-xZnxO3(x=0,0.05,0.1,0.2,0.3,0.5),并将其用于乙醇水蒸气重整反应.利用X射线衍射、程序升温还原和X射线光电子能谱对催化剂进行了表征.结果表明,Zn的加入不利于形成LaCo1-xZnxO3钙钛矿结构,当x≥0.1时产生了一些分离相.新鲜LaCo0.9Zn0.1O3催化剂中意外发现存在Co3O4相,这有利于催化剂反应性能的提高.反应后的催化剂结构发生变化,形成了La2O2CO3,而该物质有利于积炭的消除和甲烷的重整.
이용일보저몽산락합법합성료개태광LaCo1-xZnxO3(x=0,0.05,0.1,0.2,0.3,0.5),병장기용우을순수증기중정반응.이용X사선연사、정서승온환원화X사선광전자능보대최화제진행료표정.결과표명,Zn적가입불리우형성LaCo1-xZnxO3개태광결구,당x≥0.1시산생료일사분리상.신선LaCo0.9Zn0.1O3최화제중의외발현존재Co3O4상,저유리우최화제반응성능적제고.반응후적최화제결구발생변화,형성료La2O2CO3,이해물질유리우적탄적소제화갑완적중정.
Nanostructured LaCo1-xZnxO3 (x = 0, 0.05, 0.1, 0.2, 0.3 and 0.5) perovskites were synthesized by a one-step citric acid-complexing method for hydrogen production by the steam reforming of ethanol. For comparison, 8% CoO/ZnO and 8% CoO/La2O3 were prepared by impregnation and evaluated. The catalyst samples were characterized by X-ray diffraction, temperature-programmed reduction, and X-ray photoelectron spectroscopy. The results indicated that zinc did not favor the formation of the LaCo1-xZnxO3 perovskite and the structures of the substituted samples were less weakening than that of LaCoO3. Some segregation was observed for x ≥ 0.1. The reactivity of the studied samples was sensitive to the zinc content and lower substitution values were found to be better. An unexpected phase (Co3O4) appeared in the fresh LaCo0.9Zn0.1O3 sample. The presence of the Co3O4 phase increased the reactivity toward hydrogen production by the steam reforming of ethanol. The presence of La2O2CO3 is responsible for the low carbon deposition and the CH4 selectivity in the aged samples.