固体催化剂表面酸类型的激光喇曼光谱特性研究

Laser Raman Sperctroscopic Investigation Surface Sites of acidic Type on solid Catalysts by Adsorbed Pyridine

本文对离子型固体如多相催化载体的表面酸类型进行了吸附态的激光喇曼光谱特性的研究。并对不同类型的固体样品进行了考查,对表面脱附净化方法作了改进。实现了原位(In-Situ)测定并和真空法作了比较,实验结果证明喇曼光谱是研究多相催化剂表面酸性能的一种较好的方法,它不但能严格的区分开吡啶的物理吸附和化学吸附,而且能区别开是吸附在Bronsted酸位上还是Lewis酸位上。对不同类型的载体,催化剂和分子筛进行了测定,所得结果和其催化性能很好的关联。

For a futher probe of the surface structure. Pyridine has been adsorbed on the salide catnlyst Samples (for example: r-Abo_3, HY Zeslite, β-Zeolite L-Zeolite and complicat supports ). It has been investigated by laser Raman Spectrocopy. The Samples were preprocessed in the irert gas (Hei 99.999%) at high temperature (300℃) in the model LR-Ⅲ in situ cell. Then the adsorbed pyridine at reguired temperature was measured by LRS. The bands at V_1 = 990cm^(-1) V_(12)= 1031cm^(-1) and V_(12)= 3032cm_(-1) are attrited to the Pyridine in pugsical adsorption state. Addetion bands regeions: 995-1004cm^(-1), 1012-1020cm^(-1) are atteited to the phyridene in the Chenical state, of which the band at 999cm^(-1) and Lewis acid sites tespecribely bands would disapper upon cvacuation at variant temperatures.