某些有机物在氧化物载体表面的自发单层分散

自发单层分散原理已在载负型催化剂制备、再生等方面得到越来越广泛的应用1，2]．许多氧化物和盐类可以在载体表面形成单层分散或亚单层分散．有些分散物与载体混合后在低于其熔点的温度下处理，就可以自发分散到载体表面1，3]．这一现象通过XRD、LRS、XPS、SIMS、ISS、EXAFS

Spontaneous Monolayer Dispersion of Some Organic Compounds on Oxide-supports

XRD and FT-IR methods were applied to the studies of organic monolayer dispersion systems. Naphthalene, borneol, benzoic acid, salicylic acid, phthalic acid and tartaric acid were mixed with γ-Al2O3 and SiO2 separately. The results showed that the organic compounds can also disperse spontaneously onto the surfaces of different oxide-supports to become high dispersion states like the behavior of inorganic salts and oxides. The organic substances studied are more ready to disperse with 1ess carboxyl or hydroxyl groups on their aromatic nucleus, suggesting the migration on the surface of the support is rate-determining during the dispersion. This point of view is supported by the result of IR spectroscopy. The IR spectra of dispersed systems suggest that the carboxy1 may react with the surface hydroxyl groups of the support to form salt-like structures on the surface.