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Preparation and Acid Catalytic Activity of TiO2 Grafted Silica MCM-41 with Sulfate Treatment
?Dai-shi Guo,Zi-feng Ma*,Chun-sheng Yin ,Qi-zhong Jiang
Author NameAffiliationE-mail
?Dai-shi Guo Department of Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China  
Zi-feng Ma* Department of Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China zfma@sjtu.edu.cn 
Chun-sheng Yin School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China  
Qi-zhong Jiang Department of Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China  
Abstract:
TiO2 grafted silica MCM-41 catalyst with and without sulfate treatment were prepared. The structural and acid properties of these materials were investigated by XRD, N2 adsorption-desorption, element analysis, thermal analysis, Raman and FTIR measurements. Their acid-catalytic activities were evaluated using the cyclization reaction of pseudoionone. It was found that the obtained materials possess well-ordered mesostructure, and the grafted TiO2 components were in highly dispersed amorphous form. T/MCM41 without sulfation contained only Lewis acid sites, while Br?nsted and Lewis acidities were remarkably improved for the sulfated materials ST/MCM41 and d-ST/MCM41. T/MCM-41 was not active for the cyclization reaction of pseudoionone, but ST/MCM-41 and d-ST/MCM-41 possessed favorable catalytic activities. The catalytic performance of ST/MCM-41 was comparable with that of the commercial solid acid catalyst of Amberlyst-15, and better than that of d-ST/MCM-41, although the latter underwent a second TiO2 grafting process and accordingly had higher Ti and S content. The specific surface structure of Si-O-Ti-O-S=O in ST/MCM-41 and the bilateral induction effect of Si and S=O on Si-O-Ti bonds were speculated to account for its higher acid catalytic activity.
Key words:  TiO2 grafting, Sulfate treatment, Silica MCM-41, Acid catalytic activity, Cyclization of pseudoionone
FundProject:国家自然科学基金
Preparation and Acid Catalytic Activity of TiO2 Grafted Silica MCM-41 with Sulfate Treatment
郭岱石,马紫峰*,印春生,蒋淇忠
摘要:
采用连续嫁接方法对纯硅MCM-41孔道表面分别进行一次和两次TiO2修饰,并进行了硫酸根促进,制备了具有规整介孔结构的硫酸根促进型复合金属氧化物ST/MCM-41和d-ST/MCM-41;同时制备了经一次钛修饰但未经硫酸根促进的样品T/MCM-41作为对比. 利用XRD、氮吸附-脱附、元素分析、拉曼光谱和红外光谱等表征手段,对所制样品的结构和表面酸性进行考察;利用假性紫罗兰酮环化这一典型的酸催化反应对其催化活性进行评价,并与工业应用的大孔磺酸树脂Amberlyst-15进行催化性能比较. 表征结果显示,纯
关键词:  钛嫁接,硫酸根促进,纯硅MCM-41,酸催化活性,假性紫罗兰酮环化反应
DOI:10.1088/1674-0068/21/01/21-26
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