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Partial Oxidation of Methane to Synthesis Gas over hexaaluminates LaMAl_(11)O_(19-δ) catalysts

Journal of Natural Gas Chemistry 2007年第1期16卷 60-63页

作者： Zhanlin Xu Lina Zhao Fang Pang Liang Wang Chunyan Niu College of Chemistry Jilin Normal University Siping 136000 Jilin China

A series of M-substituted hexaaluminates LaMAl11O19-δ （M=Fe, Co, Ni, Mn, and Cu） were prepared and characterized by XRD, XPS, TPR and TGA techniques, respectively. They exhibited different reducibility and catalytic activity for partial oxidation of methane （POM） to synthesis gas. Among the LaMAl11019-δ samples, LaNiAl11O19-δ showed the best catalytic activity for the topic reaction and selectivity for synthesis gas at 780 ℃ for 2 h. The conversion of CH4 was over 99.2%, and the product selectivity for both CO and H2 was above 90.3%.

关键词： partial oxidation CH4 synthesis gas hexaaluminates LaMAl11 O19-δ Fe Co Ni Mn Cu

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Crystallization behavior of plasma-sprayed lanthanide magnesium hexaaluminate coatings

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International Journal of Minerals,Metallurgy and Materials 2014年第12期21卷 1247-1253页

作者： Liang-liang Huang Hui-min Meng Jing Tang Corrosion and Protection Center University of Science and Technology Beijing

LaMgAl11O19 thermal barrier coatings （TBCs） were prepared by atmospheric plasma spraying. The crystallization behavior of the coatings and the synthesis mechanism of LaMgAl11O19 powders were researched. The results showed that the plasma-sprayed coatings conmined some amorphous phase, and LaMgAl11O19 powders were partially decomposed into Al2O3, LaAlO3, and MgAl2O4 in the plasma spraying process. The amorphous phase was reerystallized at a temperature of approximately 1174.9℃, at which level the decomposed Al2O3, LaAl2O3, and MgAl2O4 reacted again. The resynthesis temperature of LaMgAl11O19 in the plasma-sprayed coatings was lower than that of LaMgAl11O19 in the original raw powders. The synthesis mechanism of LaMgAl11O19 powders can be summarized as follows： during the first part of the overall reaction, La2O3 reacts with Al2O3 to form LaAl2O3 at approximately 900℃, and then LaAl2O3 further reacts with Al2O3 and MgAl2O4 to produce LaMgAl11O19 at approximately 1200℃.

关键词： thermal barrier coatings hexaaluminates plasma spraying crystallization

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