Synthesis of acid-functionalized composite via surface deposition of acid-containing amorphous carbon

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• 作者：Bin Du ; Xuan Zhang ; Lan-Lan Lou ; Yanling Dong ; Gaixia Liu ; Shuangxi Liu ; ^{sxliu@nankai.edu.cn}
• 关键词：Acid-functionalized composite ; Carboxylic and sulfonic groups ; Hydrothermal ; Acetalization of carbonyl compounds
• 刊名：Applied Surface Science
• 出版年：2012
• 期刊代码：6_01694332
• 类别：ms
• 出版时间：1 July, 2012
• 卷：258
• 期：18
• 页码：7166-7173
• 文件大小：1103 K

摘要

A synthetic procedure, including two steps: a hydrothermal treatment using H₂SO₄ solution and a thermal treatment with concentrated H₂SO₄ in Teflon-lined stainless autoclaves was developed to synthesize acid-functionalized composite. In this process, the carbonization of glucose which contributed to the formation of carbon species with acid functional groups occurred on the silica surface. The resultant composite, investigated by powder XRD, low temperature N₂ sorption and TEM, possessed well-defined mesostructure. And it was determined by XPS that amorphous carbon was deposited at the silica surface of SBA-15. The presence of multi-functional groups in the composite was confirmed by FT-IR results. Furthermore, carboxylic and sulfonic groups could be incorporated into the composite material via the covalent bond. The composite was employed as the catalyst for the acetalization of carbonyl compounds. It was suggested that acid sites were well dispersed, which was responsible for the good performance in the catalytic test. According to these facts, a synthesis route for mesostructured composite with acid functional groups has been proposed.