SnO2掺杂对SO42-/TiO2固体酸催化剂酯化反应活性的影响

Effect on catalytic activity of esterification of SnO2-Doped SO42-/TiO2

摘要:

采用共沉淀与浸渍法制备了一系列不同SnO2掺杂量（1%-7%，摩尔分数）SO42-/TiO2-SnO2固体酸催化剂，利用N2-吸附脱附分析、FT-IR、XPS、NH3-TPD等手段对催化剂的结构和性质进行了表征，结果表明： SnO2掺杂可以有效改善催化剂的比表面积与孔道结构，有利于与SO42-形成配位结构，显著增加了催化剂酸性中心数量，从而增强了催化性能。SnO2掺杂量为5%的SO42-/TiO2-SnO2固体酸催催化丙烯酸与莰烯酯化反应中，莰烯的转化率为77.3%，丙烯酸异冰片酯选择性98.4%，较于SO42-/TiO2，显示出更高的反应活性与稳定性。

Abstract:

A series of SnO2-doped (1%-7%,molar fraction)SO42-/TiO2-SnO2 catalysts were prepared by a method of co-precipitation and impregnation.The structures and properties of these catalysts were characterized by N2-adsorption and desorption、FT-IR、XPS、NH3-TPD.The result showed that the specific surface area and pore structure of catalyst were improved,coordination structure with SO42- were formed easily and the amount of acid center on surface were increased observably by doping SnO2. The activity of the catalyst was enhanced caused by these factors.The conversion of camphene was 77.3% and the selectivity of isobornyl acrylate was 98.4% in Esterification reaction of crylic acid with camphene catalyzed by SO42-/TiO2-SnO2 solid acid catalyst doped with 5% molar fraction of SnO2. Compared with SO42-/TiO2, SO42-/TiO2-SnO2 exhibited higher activity and stability.