Synthesis of titanium silicalite-1 with small crystal size by using mother liquor of titanium silicalite-1 as seeds (II): Influence of synthesis conditions on properties of titanium silicalite-1
发布时间：2019-03-09
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- 论文类型：
- 期刊论文
- 发表时间：
- 2012-11-01
- 发表刊物：
- MICROPOROUS AND MESOPOROUS MATERIALS
- 收录刊物：
- Scopus、EI、SCIE
- 文献类型：
- J
- 卷号：
- 162
- 页面范围：
- 105-114
- ISSN号：
- 1387-1811
- 关键字：
- Titanium silicalite-1; Synthesis condition; Seed; Purification method; Epoxidation of propylene
- 摘要：
- Titanium silicalite-1 with small crystal size (small-crystal TS-1) was synthesized in a TPABr-ethylamine hydrothermal system by using the mother liquor of nano-sized TS-1 as seeds. The synthesis conditions were systematically studied, including the purification methods of the small-crystal TS-1. Si/Ti molar ratio in TS-1, amount of the added seed and the crystallization period. The as-synthesized TS-1 was characterized by X-ray powder diffraction (XRD), Fourier-transform infrared (FT-IR). Ultraviolet-visible diffuse reflectance (UV-vis), Ultraviolet Raman spectroscopy (UV-Raman), nitrogen sorption, elemental analysis, atomic force microscope (AFM) and scanning electron microscopy (SEM). The size of the TS-1 crystals formed (about 600 nm x 400 nm x 250 nm) was not significantly affected by the synthesis conditions except for the amount of added seed. The catalytic performance of the synthesized small-crystal TS-1 for the epoxidation of propylene was evaluated. The conversion of hydrogen peroxide, the selectivity of propylene oxide and the utilization of hydrogen peroxide reached 92.2%, 98.0% and 97.0%, respectively, when the mother liquor of small-crystal TS-1 was purified three times by precipitation, the Si/Ti molar ratio was 50, the seed/SiO2 weight ratio was 0.06 and the crystallization time was 48 h. (C) 2012 Elsevier Inc. All rights reserved.
- 第一作者
- Zuo, Yi
- 合写作者
- Guo, Xinwen,Wang, Xiangsheng
- 通讯作者
- Guo, XW (reprint author), Dalian Univ Technol, Dept Catalysis Chem & Engn, State Key Lab Fine Chem, Sch Chem Engn, Dalian 116024, Peoples R China.