Na-W-Mn/SiO_2催化剂的拉曼光谱研究

Study on the Laser Raman Spectra of A Series of Na-W-Mn/SiO_2Catalysts

对含有不同 Na、W、Mn组分的 Na- W- Mn/ Si O2 系列催化剂进行了付里叶变换激光拉曼光谱测定和研究 ,并参考先前的与之相关催化剂的拉曼光谱 ,对它们的特征拉曼吸收谱带进行了归属。结果表明 :960 ,92 8,81 0 ,789cm-1等吸收峰是 Na- W- Mn/ Si O2 催化剂中 Na-O- W物种的特征吸收谱带 ;62 7,577,51 7,478cm-1等吸收峰是 Na- O- Mn物种的特征吸收谱带 ;Na- O- W分布在距催化剂表面较深的体相中 ;Na- O-

The Fourier transformed laser Raman spectra of a series of Na W Mn/SiO 2catalysts with different amount of sodium, tungsten, and manganese were measured and analyzed. The Raman bands of the catalysts were assigned by comparison with a large number of previously studied catalysts of similar structures. It was found that for the Na W Mn/SiO 2catalysts, the bands of the Na O W species were at 960, 928, 810, and 789 cm -1 and the bands for the Na O Mn species were at 627, 577, 517 and 478 cm -1 respectively. The Na O W species exists in the bulk of the catalysts whereas the Na O Mn species is on the surface of the catalysts.