Abstract:

Mesoporous MCM-type catalysts with amine were synthesized by co-condensation of tetraethyl orthosilicate (TEOS) and 3-aminopropyltriethoxysilane (APTES) using n-dodecylamine as template under neutral condition, and then characterized by XRD, N₂ adsorption-desorption, IR and TGA.The results indicated that the incorporation of aminopropyl was successful, but the excess aminopropyl might destroy the mesoporous structure of the catalysts, which resulted in the decreases of specific surface area and pore volume.The influences of aminopropyl content and catalyst dosage on the cracking reaction were investigated.Under optimal condition, the yield of methylchloromonosilanes and conversion of high-boiling residues reached 63.3% and 76.6% respectively.

Key words:

氨丙基改性, 介孔分子筛, 有机硅高沸物, 催化裂解

摘要：

以十二胺（C₁₂）为模板剂， 3-氨丙基三乙氧基硅烷（APTES）与正硅酸四乙酯（TEOS）为原料，在中性条件下，利用共缩聚法合成了含胺MCM型介孔催化剂。采用X射线粉末衍射（XRD）、N₂吸附-脱附、红外（IR）及热重分析（TGA）等手段对催化剂进行表征，结果表明，氨丙基已引入介孔MCM，但过量氨丙基引入会破坏催化剂介孔结构，导致催化剂比表面积和比孔容降低。考察了氨丙基含量和催化剂用量对裂解反应的影响，最佳条件下，单体产率和高沸物转化率分别为63.3%和76.6%。

关键词:

氨丙基改性, 介孔分子筛, 有机硅高沸物, 催化裂解