新型固体酸SO42-/C-TiO2-CeO2的制备与表征

Preparation and Characterization of New Type Solid Acid Catalyst SO42-/C-TiO2-CeO2

摘要:

采用高温磺化法制备复合型稀土改性固体酸SO42-/C-TiO2-CeO2，以油酸与甲醇发生的酯化反应作为探针反应，考察稀土氧化物CeO2的百分含量、磺化温度、磺化时间对催化剂SO42-/C-TiO2-CeO2催化活性的影响。结果表明，制备催化剂SO42-/C-TiO2-CeO2的最佳条件：稀土CeO2的含量为2%、磺化温度为200℃、磺化时间为10h，此条件下催化油酸与甲醇发生酯化反应的酯化率最高，可达到94.78%。利用红外光谱、X射线衍射、扫描电镜、热重分析、X荧光等手段对固体酸催化剂进行表征分析，表明稀土氧化物CeO2和金属氧化物TiO2共同作用下可固化SO42-，并与SO42-形成配位结构，增强固体酸催化剂的催化性能并提高稳定性。

Abstract:

Complex rare earth solid acid catalyst SO42-/C-TiO2-CeO2 was prepared using high temperature sulfonation.The catalytic performance of the catalyst was evaluated by esterification reaction of oil acid and methanol as a probe reaction and the influence of catalytic activity such as the content of the rare earth CeO2,sulfonation temperature and sulfonation time was studied.The results showed that the catalyst SO42-/C-TiO2-CeO2 was prepared under the best preparation conditions of the rare earth CeO2 mol percentage of 2%,the sulfonation temperature of 200℃ and sulfonation time of 10h,under these conditions,the catalytic esterification rate of waste oil with methanol esterification was highest and reached 94.78%.The catalyst was characterized by FTIR,XRD,SEM,DTG and X-ray fluorescence,which shows that the rare earth oxide CeO2 and metal oxide TiO2 cured SO42- role in common, promoted SO42- with bidentate structure, enhanced catalytic activity and improved the stability of the catalyst SO42- /C-TiO2-CeO2.