activity in oxidativecoupling of methane. Calculations of the rare earth-oxygen (AO) and cocation-oxygen (BO) bondenergies provide a new way to estimate the influence of bulk parameters on the formation of C2 hydrocarbons. The observed values of C2 yields on A2B2O7 catalysts (A = Sm, Gd or Eu) (B = Ti, Zr, or Sn) indicate that they increase with decreasing cocation-oxygen bondenergy. The best of
通式A 2 B 2 O 7的化合物已通过X射线衍射表征,并测试了甲烷氧化偶联中的催化活性。稀土-氧(AO)和共-氧(BO)键能的计算提供了一种新的方法来估算体积参数对C 2烃形成的影响。在A 2 B 2 O 7催化剂(A = Sm,Gd或Eu)(B = Ti,Zr或Sn)上观察到的C 2收率值表明,它们随着共-氧键能的降低而增加。这些系统中最好的(Sm 2 Sn 2 O 7)给出C 2 在973 K时产率为20%。
Hirano, Shin-ichi; Hayashi, Takashi; Hattori, Akiyoshi, Journal of the American Ceramic Society, 1991, vol. 74, p. 1320 - 1324
The gas‐sensing properties of spinodally decomposed (Ti,Sn)O2 thin films on sapphire substrates were investigated for CO, C3H8, and C2H5OH, and hydrogen gases at a temperature of 500°C. The variation in the d‐spacing of the (101) plane of (Ti0.5Sn0.5)O2 films showed behavior that was typical of spinodal decomposition during annealing at a temperature of 900°C. Transmission electron micrographs of the spinodally decomposed (Ti,Sn)O2 films on sapphire (0112) substrates revealed the characteristic modulated structure. The modulated lamella microstructure consisted of TiO2‐ and SnO2‐rich regions at intervals of ∼10 nm. The films were very sensitive to hydrogen gas and revealed anisotropic electrical conduction that was influenced by the modulated microstructure, which is characteristic of spinodal decomposition.