关键词:

磷钨酸铯, 固载化, 硅胶载体, 催化性能

Abstract: Some supported cesium salts of 12-tungstophoric acid (Cs_2.5H_0.5PW₁₂O₄₀) were prepared. The effects of support category,support properties, preparation methods and preparation conditions on the performance of supported Cs_2.5H_0.5PW₁₂O₄₀ catalysts were investigated. The catalysts prepared were characterized by XRD and Hammett indicator method. The results showed that silica gel is the preferred support, among Al₂O₃, silica gel, active carbon, MCM-41 and Si MCM-41. With decreasing sodium content of silica gel support,the activity of prepared catalyst increased. The catalysts prepared by both one-step method and two-step method showed strong acidity, high activity and excellent stability. XRD revealed that CsCO3 completely reacted with H3PW12O40 and formed Cs_2.5 H_0.5PW₁₂O₄₀ on the surface of silica gel support. Hammett constant（H₀）of the catalyst was lower than -13.61. The Cs_2.5H_0.5PW₁₂O₄₀/SiO₂ catalyst (loading of Cs_2.5H_0.5PW₁₂O40 40%) showed the highest catalytic activity for the etherification of FCC light gasoline, and the etherification conversion of tertiary carbonic olefins was up to 56.54%, which could replace liquid acids and ion exchange resin and become a environmentally friendly solid acid catalyst.

Key words:

磷钨酸铯, 固载化, 硅胶载体, 催化性能