负载型Cs2.5H0.5PW12O40醚化催化剂的制备与催化性能

制备了负载型磷钨酸铯(Cs_2.5H_0.5PW₁₂O₄₀)催化剂，考察了载体种类、载体性质、制备方法和制备条件对催化剂性能的影响,对制备的催化剂进行了表征，并考察了负载型Cs_2.5H _0.5PW₁₂O₄₀作为醚化催化剂的催化活性.结果表明,大孔硅胶是Cs_2.5H_0.5PW₁₂O₄₀的适宜载体，硅胶的钠含量越低制备的Cs_2.5H_0.5PW₁₂O₄₀/SiO₂催化剂的活性越高.采用一步法和二步法制备的Cs_2.5H_0.5PW₁₂O₄₀/SiO₂催化剂均具有较强的酸性、催化活性以及良好的稳定性,可以替代液体酸和阳离子交换树脂,成为一种环境友好的固体酸催化剂.

PREPARATION AND CATALYTIC PERFORMANCE OF SUPPORTED Cs2.5H0.5PW12O40 ETHERIFICATION CATALYST

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.