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†,Dalton Transactions

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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†
Dalton Transactions ( IF 3.5 ) Pub Date : 2018-07-30 00:00:00 , DOI: 10.1039/c8dt02042f
Jing Zhao _{1,

2,

3,

4} , Yifu Zhang _{1,

2,

3,

4} , Fuping Tian _{1,

2,

3,

4} , Yi Zuo _{2,

3,

4,

5} , Yang Mu _{1,

2,

3,

4} , Changgong Meng _{1,

2,

3,

4}

Affiliation

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, N₂ 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 °C and a styrene conversion of 97.47% and a selectivity of 80.97% for benzaldehyde at 85 °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.

中文翻译：

高pH值可促进骨架中钒含量高的V-Silicalite-1的合成及其对苯乙烯选择性氧化的催化作用†

很难在骨架中合成具有高钒含量的Silicalite-1分子筛，因为杂原子会显着影响V-Silicalite-1的形成。在此，通过将pH控制在高水平，成功地合成了在分子筛的框架内具有高钒含量的V-Silicalite-1。在水热合成过程中，OH ^-离子有效地促进了钒的原子的进入分子筛的框架。通过XRD，FTIR，UV-vis，XPS，EPR，ICP，FE-SEM，元素图谱，N ₂表征具有不同钒含量的V-Silicalite-1样品吸附-解吸和TPR，证实钒原子成功取代了骨架中的硅原子。V-Silicalite-1在不同温度下的苯乙烯选择性氧化中表现出良好的催化性能，在25°C下苯乙烯转化率高达84.89％，对苯乙烯氧化物的选择性为91.04％，苯乙烯转化率为97.47％。在85°C下对苯甲醛的选择性为80.97％。该研究为框架中高钒含量分子筛的合成提供了新思路。此外，它还使钒掺杂的分子筛可以直接用于工业上苯乙烯的催化氧化。

更新日期：2018-07-30

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