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A Ti-based bi-MOF for the tandem reaction of H2O2 generation and catalytic oxidative desulfurization

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Abstract

In the past, H2O2 has been used as an oxidant when Ti-based materials are used as catalysts at ambient conditions. However, H2O2 suffers from high cost and safety concerns. Therefore, replacing H2O2 with O2 has been highly desired. In this study, a Ti-based bi-MOF, MIL-125(Ti)@NH2-MIL-125(Ti) has been synthesized through the internal extended growth of MIL-125(Ti) on NH2-MIL-125(Ti). This Ti-based bi-MOF performed in sequence to synergistically catalyze the oxidative desulfurization (ODS) reaction with O2. In this bi-MOF catalyst, MIL-125(Ti) is partly embedded and well distributed on the surface of NH2-MIL-125(Ti). NH2-MIL-125(Ti) serves as a catalyst for the production of H2O2 from O2/methanol under visible light, while MIL-125(Ti) serves as an ODS catalyst. The ODS over MIL-125(Ti) is the most effective as the in situ generated H2O2 could be used fully, and the consumed H2O2 (ODS reaction) also promotes further H2O2 production through the Le Chatelier's principle. MIL-125(Ti) and NH2-MIL-125(Ti) exist in close proximity in the bi-MOF material, which leads to an increase in the catalytic efficiency by 2.5-fold in comparison to that obtained from their physical mixture.

Graphical abstract: A Ti-based bi-MOF for the tandem reaction of H2O2 generation and catalytic oxidative desulfurization

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Article information


Submitted
15 Nov 2019
Accepted
05 Jan 2020
First published
06 Jan 2020

Catal. Sci. Technol., 2020, Advance Article
Article type
Paper

A Ti-based bi-MOF for the tandem reaction of H2O2 generation and catalytic oxidative desulfurization

X. Liao, W. Wei, Y. Zhou, M. Zhang, Y. Cai, H. Liu, Y. Yao, S. Lu and Q. Hao, Catal. Sci. Technol., 2020, Advance Article , DOI: 10.1039/C9CY02318F

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