Effect of ammonium salts on the synthesis and catalytic properties of TS-1

被引:47
作者
Fan, Weibin [1 ]
Fan, Binbin [2 ]
Shen, Xiaohua [1 ]
Li, Junfen [1 ]
Wu, Peng [3 ]
Kubota, Yoshihiro [4 ]
Tatsumi, Takashi [5 ]
机构
[1] Chinese Acad Sci, Inst Coal Chem, State Key Lab Coal Convers, Taiyuan 030001, Peoples R China
[2] Taiyuan Univ Technol, Inst Special Chem, Taiyuan 030024, Peoples R China
[3] E China Normal Univ, Shanghai Key Lab Green Chem & Chem Proc, Shanghai 200062, Peoples R China
[4] Yokohama Natl Univ, Grad Sch Engn, Div Mat Sci & Chem Engn, Catalysis Lab,Hodogaya Ku, Yokohama, Kanagawa 2408501, Japan
[5] Tokyo Inst Technol, Chem Resources Lab, Catalyt Chem Div, Midori Ku, Yokohama, Kanagawa 2268503, Japan
基金
美国国家科学基金会; 日本科学技术振兴机构;
关键词
Ammonium salt; Hydrothermal synthesis; TS-1; Oxidation catalysis; MOLECULAR-SIEVES; CRYSTALLIZATION MECHANISM; TITANIUM SILICATES; HYDROGEN-PEROXIDE; ALKALI-METAL; OXIDATION; ZEOLITE; IONS; MWW; HYDROPHOBICITY;
D O I
10.1016/j.micromeso.2009.03.018
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
Effects of ammonium salts on the synthesis and characteristics of TS-1 were studied by adding different ammonium salts (NH(4)F, NH(4)Cl, NH(4)Br, NH(4)I, CH(3)COONH(4), NH(4)NO(3), (NH(4))(2)CO(3), (NH(4))(2)SO(4) and (NH(4))(3)PO(4)) to the synthesis gel. It was shown that the fine structure and crystal morphology of the synthesized materials depended on the type of ammonium salts. Except for NH(4)F, the ammonium salts, and particularly (NH(4))(2)SO(4) and (NH(4))(3)PO(4) significantly decreased the crystallization rate as a result of remarkably reducing the pH value of the crystallization mixture. Nevertheless, all of these ammonium salts were favorable for the incorporation of Ti in the framework, and the beneficial effect was dependent on the type of ammonium salts. In addition, the ammonium salt also has a strong influence on the catalytic properties of the prepared catalyst. It is worth noting that the catalytic performance of TS-1 was closely related to the substrate molecules. TS-1 catalyst prepared in the presence of (NH(4))(2)SO(4) gave the highest conversion in the epoxidation of 1-hexene, whereas that prepared with (NH(4))(2)CO(3) Was Suitable for the oxidation of phenol. (C) 2009 Elsevier Inc. All rights reserved.
引用
收藏
页码:301 / 308
页数:8
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