Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (6): 1914.doi: 10.7503/cjcu20200789

• Physical Chemistry • Previous Articles     Next Articles

Molybdenum Peroxide Anchored on Fluoronated UiO-66 as Catalyst in the Oxidation of Sulfur Containing Compounds

ZHANG Renli1, WANG Yao1(), YU Zhiquan1,2, SUN Zhichao1,2, WANG Anjie1,2, LIU Yingya1,2()   

  1. 1.School of Chemical Engineering
    2.State Key Laboratory of Fine Chemical,Dalian University of Technology,Dalian 116024,China
  • Received:2020-11-02 Online:2021-06-10 Published:2021-06-08
  • Contact: WANG Yao E-mail:wangyao@dlut.edu.cn;yingya.liu@dlut.edu.cn

Abstract:

The oxidative desulfurization(ODS) process is a very important tool to reduce sulfur emission and to comply with the increasingly stringent environmental regulations for fuels. Metal-organic frameworks with high specific surface area can introduce the 2nd metal sites via. chemical bonding, thus constructing a heterogeneous catalytic system with good chemical stability, which has advantages in the field of liquid-phase oxidative desulfurization. In this work, the ligand functional groups of UiO-66 were modified by pre-modification. Firstly, the hydrophilic and hydrophobic properties of UiO-66 were regulated by introducing —F; secondly, MoO(O22 was loaded on the UiO-66 framework by introducing —NH2. The contact angle test showed that the introduction of fluorine effectively improved the hydrophobicity of the carrier surface, and thermogravimetric analysis proved that there were more ligand missing on the fluorine-modified UiO-66 framework, thus effectively improving the Lewis acidity of the overall MOF framework. The effects of reaction temperature, ratio of oxygen to sulfur and catalyst dosage on catalytic performance were investigated by orthogonal experiment with dibenzothiophene(DBT) oxidation as the model reaction and cumene hydroperoxide(CHP) as the oxidant. The results show showed that O/S molar ratio is the key factor affecting DBT conversion. The catalytic activity of the fluorine modified catalyst has no obvious change after five catalytic cycles, and the framework remains stable.

Key words: Hydrophobicity, Oxidative desulfurization, Dibenzothiophene, Metal-organic framework

CLC Number: 

TrendMD: