569352-47-2Relevant academic research and scientific papers
Synthesis of acid-base bifunctional mesoporous materials by oxidation and thermolysis
Yu, Xiaofang,Zou, Yongcun,Wu, Shujie,Liu, Heng,Guan, Jingqi,Kan, Qiubin
, p. 951 - 957 (2011)
A novel and efficient method has been developed for the synthesis of acid-base bifunctional catalyst SO3H-MCM-41-NH2. This method was achieved by co-condensation of tetraethylorthosilicate (TEOS), 3-mercaptopropyltrimethoxysilane (MPTMS) and (3-triethoxysilylpropyl) carbamicacid-1-methylcyclohexylester (3TAME) in the presence of cetyltrimethylammonium bromide (CTAB), followed by oxidation and then thermolysis to generate acidic site and basic site. X-ray diffraction (XRD) and transmission electron micrographs (TEM) show that the resultant materials keep mesoporous structure. Thermogravimetric analysis (TGA), X-ray photoelectron spectra (XPS), back titration, solid-state 13C CP/MAS NMR and solid-state 29Si MAS NMR confirm that the organosiloxanes were condensed as a part of the silica framework. The bifunctional sample (SO 3H-MCM-41-NH2) containing amine and sulfonic acids exhibits excellent acid-basic properties, which make it possess high activity in aldol condensation reaction between acetone and various aldehydes.
