High pH promoting the synthesis of V-Silicalite-1 with high vanadium content in the framework and its catalytic performance in selective oxidation of styrene
发表时间：2019-03-12
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- 论文类型：
- 期刊论文
- 第一作者：
- Zhao, Jing
- 通讯作者：
- Zhang, YF (reprint author), Dalian Univ Technol, Sch Chem, Dalian 116024, Peoples R China.
- 合写作者：
- Zhang, Yifu,Tian, Fuping,Zuo, Yi,Mu, Yang,Meng, Changgong
- 发表时间：
- 2018-09-07
- 发表刊物：
- DALTON TRANSACTIONS
- 收录刊物：
- SCIE
- 文献类型：
- J
- 卷号：
- 47
- 期号：
- 33
- 页面范围：
- 11375-11385
- ISSN号：
- 1477-9226
- 摘要：
- It is difficult to synthesize a Silicalite-1 molecular sieve with a high vanadium content in the framework, because heteroatoms significantly affect the formation of V-Silicalite-1. Here, V-Silicalite-1 with a high vanadium content in the framework of the molecular sieve was successfully synthesized by controlling the pH at high levels. In the process of hydrothermal synthesis, OH- ions effectively promoted the entry of vanadium atoms into the framework of the molecular sieve. Samples of V-Silicalite-1 with different vanadium contents were characterized by XRD, FTIR, UV-vis, XPS, EPR, ICP, FE-SEM, elemental mapping, N-2 adsorption-desorption, and TPR, which confirmed that vanadium atoms successfully replaced silicon atoms in the framework. V-Silicalite-1 exhibited good catalytic performance in the selective oxidation of styrene at different temperatures, with a styrene conversion of up to 84.89% and a selectivity of 91.04% for styrene oxide at 25 degrees C and a styrene conversion of 97.47% and a selectivity of 80.97% for benzaldehyde at 85 degrees C. This study provided a new idea for the synthesis of molecular sieves with high vanadium contents in the framework. Besides, it also enabled the direct application of vanadium-doped molecular sieves for the catalytic oxidation of styrene in industry.
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