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. Issue 33 (30th July 2018)

• Record Type: Journal Article
• Authors: Zhao, Jing; Zhang, Yifu; Tian, Fuping; Zuo, Yi; Mu, Yang; Meng, Changgong
• Is Part Of: Dalton transactions. Volume 47:Issue 33(2018)
• Page Start: 11375
• Page End: 11385
• Publication Date: 2018-07-30
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c8dt02042f
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : V-Silicalite-1 with a high vanadium content in the framework was synthesized. OH − ions effectively promoted the entry of vanadium atoms into the framework. The V-Silicalite-1 exhibited good catalytic performance. Abstract : 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.