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应用X射线衍射 (XRD) ,傅里叶变换激光拉曼光谱 (FT LRS)和微型催化反应装置等测试手段研究了丙烷选择氧化的Bi Mo复合氧化物催化剂的结构和催化性能 .结果表明 ,Bi组分是丙烷催化氧化脱氢为丙烯的主要活性组分 ,而丙烯醛选择性的大小与Bi Mo复合氧化物催化剂的组成和结构密切相关 .不同组成的Bi Mo复合氧化物催化剂在丙烷转化率 (～ 2 8 0 % )相近的情况下 ,其丙烯醛选择性随Mo/ (Mo +Bi)原子比的增加先逐渐增加 ,在Mo/ (Mo +Bi)原子比为 0 5 0时达极大值 (～ 2 8 1% ) .随Mo/ (Mo +Bi)原子比进一步增加 ,丙烯醛选择性又急剧下降 .XRD和FT LRS结果表明 ,Bi2 O3 和MoO3 之间可形成二元Bi Mo O晶相固溶体 ,从而显著提高了催化剂对选择氧化反应的催化性能 .尤其是当α Bi2 (MoO4 ) 3 和γ Bi2 MoO6两相共存时 ,Bi Mo复合氧化物催化剂具有较优良的选择氧化催化性能 .γ Bi2 MoO6参与了α Bi2 (MoO4 ) 3 对丙烷的选择氧化 ,加速了选择氧化活性氧物种的再生
The structure and catalytic performance of the catalysts were investigated by X-ray diffraction (XRD), Fourier transform Raman spectroscopy (FT LRS) and micro-catalytic reactor. The results show that the Bi The component is the main active component of propane catalytic oxidative dehydrogenation to propylene, and the selectivity of acrolein is closely related to the composition and structure of Bi Mo composite oxide catalyst.Bi Mo composite oxide catalysts with different compositions have the highest propane conversion (~280%), the selectivity of acrolein increases with the increase of atomic ratio of Mo / (Mo + Bi). When the atomic ratio of Mo / (Mo + Bi) The selectivity to acrolein decreased sharply with the atomic ratio of Mo / (Mo + Bi) increasing further.The results of XRD and FT LRS showed that the binary Bi Mo could be formed between Bi 2 O 3 and MoO 3 O solid solution, which significantly improves the catalytic performance of the catalyst for selective oxidation reaction. Especially when α Bi2 (MoO4) 3 and γ Bi2 MoO6 two phases coexist, the Bi Mo composite oxide catalyst has more excellent selective oxidation catalytic properties .γ Bi2 MoO6 is involved in α Bi2 (MoO4 ) 3 The selective oxidation of propane accelerated the regeneration of selective oxidation of reactive oxygen species