CAJ | 학술논문

以PEG 400为分散剂,采用一步柠檬酸络合法制备了LaXCoO3(X = Mg, Ca, Sr, Ce； La：X =3：2)复合催化剂。采用X射线衍射、红外光谱、扫描电镜、X射线光电子能谱、N2吸附-脱附和H2程序升温还原等技术对复合催化剂进行了表征,考察了不同元素A位取代对LaCoO3钙钛矿结构的影响,进而研究了其对乙醇水蒸气重整制氢的催化性能和稳定性。结果表明,在高含量取代时,只有Ce取代的样品能够保持单一的钙钛矿晶型； Ca或Sr取代的样品产生的Co3O4分离相有利于复合催化剂活性中心钴的还原； Sr或Ce取代的样品在反应中表现出较好的活性和稳定性, Sr取代的样品活性更高。
이PEG 400위분산제,채용일보저몽산락합법제비료LaXCoO3(X = Mg, Ca, Sr, Ce； La：X =3：2)복합최화제。채용X사선연사、홍외광보、소묘전경、X사선광전자능보、N2흡부-탈부화H2정서승온환원등기술대복합최화제진행료표정,고찰료불동원소A위취대대LaCoO3개태광결구적영향,진이연구료기대을순수증기중정제경적최화성능화은정성。결과표명,재고함량취대시,지유Ce취대적양품능구보지단일적개태광정형； Ca혹Sr취대적양품산생적Co3O4분리상유리우복합최화제활성중심고적환원； Sr혹Ce취대적양품재반응중표현출교호적활성화은정성, Sr취대적양품활성경고。
Perovskite nanocomposite catalysts LaXCoO3 (X = Mg, Ca, Sr, or Ce; n(La):n(X) = 3:2) have been prepared by a citric acid-complexing method and used for steam reforming of ethanol (SRE), lead-ing to hydrogen generation. The samples were characterized by X-ray diffraction, infrared spec-troscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, N2 adsorp-tion-desorption, and H2 temperature-programmed reduction. The effects of elemental substitution in the LaCoO3 perovskite were studied, and the catalytic performance and primary stability of the hydrogen production from SRE were investigated. In the highly substituted samples, only the Ce-doped sample was isolated as the pure perovskite phase. The presence of a Co3O4 phase in the Ca-doped or Sr-doped samples was beneficial for the reduction of the active Co component, while Sr-doped or Ce-doped samples showed good activity and stability. The sample incorporating Sr demonstrated better catalytic performance than those of other samples.