Chinese Journal of Catalysis ›› 2021, Vol. 42 ›› Issue (2): 279-287.DOI: 10.1016/S1872-2067(20)63625-7

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Morphology evolution of acetic acid-modulated MIL-53(Fe) for efficient selective oxidation of H2S

Xiaoxiao Zheng, Sihui Qi, Yanning Cao, Lijuan Shen*(), Chaktong Au, Lilong Jiang#()   

  1. National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou 350002, Fujian, China
  • Received:2020-03-27 Accepted:2020-05-11 Online:2021-02-18 Published:2021-01-21
  • Contact: Lijuan Shen,Lilong Jiang
  • About author:#Tel: +86-591-83731234; E-mail: jll@fzu.edu.cn
    *Tel: +86-591-83731234; E-mail: syhgslj@fzu.edu.cn;
  • Supported by:
    National Science Fund for Distinguished Young Scholars of China(21825801);National Natural Science Foundation of China(21603034);Natural Science Foundation of Fujian Province(2017J05022)

Abstract:

MIL-53(Fe) was synthesized using a “modulator approach” that utilizes acetic acid (HAc) as an additive to control the size and morphology of the resulting crystals. We demonstrate that after activation under vaccum at 100 °C, the MIL-53(Fe) functions well for H2S selective oxidation. The introduction of acetic acid in the presence of benzene-1,4-dicarboxylic acid (H2BDC) would result in a series of MIL-53(Fe) nanocrystals (denoted as MIL-53(Fe)-xH, x stands for the volume of added HAc with morphology evoluting from irregular particles to short hexagonal columns. The vacuum treatment facilitates the removal of acetate groups, thus generating Fe 3+ Lewis acid sites. Consequently, the resulted MIL-53(Fe)-xH exhibits good catalytic activity (98% H2S conversion and 92% sulfur selectivity ) at moderate reaction temperatures (100-190 °C). The MIL-53(Fe)-5H is superior to the traditional iron-based catalysts, showing stable performance in a test period of 55 h.

Key words: Fe-metal-organic frameworks, Hydrogen sulfide, Selective oxidation, Controllable synthesis, Acetic acid, Modulation