Synthesis of Sulfonic Acid Functionalized Silica Honeycombs
Synthesis of Sulfonic Acid Functionalized Silica Honeycombs
复制标题
磺酸功能化二氧化硅蜂窝体的合成
DOI：
10.1021/ie400541d
复制
发表时间：
2013
影响因子：
4.2
通讯作者：
向井紳
中科院分区：
文献类型：
--
作者：
佐藤慶孝;横山裕也;荻野勲;向井紳
采用磺酸基团对蜂窝状硅胶整体进行官能化处理，合成了用于流动反应体系的固体酸催化剂。磺酸基团是通过3-巯丙基三甲氧基硅烷(MPTS)锚定在二氧化硅表面，然后在过氧化氢溶液中氧化而引入的。以冰晶为模板制备了蜂窝状整体柱，发现其具有高开口额面积(≈85%)和穿透大孔(直径≈27μm)，并被硅墙(≈2μm厚)包围。在间歇反应装置和流动反应装置上考察了该催化剂在333K下乙醇和乙酸液相酯化反应的性能。在间歇反应器中，该催化剂的催化活性约为Amberlyst-15的2倍。在流动反应器中，该催化剂的催化活性也保持了24 h的稳定性。
A honeycomb-type silica monolith was functionalized with sulfonic acid groups to synthesize a solid acid catalyst for flow reaction systems. The sulfonic acid groups were introduced via anchoring of 3-mercaptopropyltrimethoxysilane (MPTS) on the silica surface and subsequent oxidation using a H2O2solution. The honeycomb-type monolith used as the substrate was prepared using ice crystals as a template and was found to have a high open frontal area of ≈85% and flow-through macropores (≈27 μm in diameter) that are surrounded by silica walls (≈2 μm in thickness). The catalyst was tested by the liquid phase esterification of ethanol with acetic acid at 333 K in a batch reactor as well as a flow reactor. The catalyst was found to exhibit about 2-fold higher catalytic activity than Amberlyst-15 in a batch reactor. The catalyst also showed a stable catalytic activity for 24 h in a flow reactor.