Ti-based bi-MOFs for the tandem reaction of H2O2 generation and catalytic oxidative desulfurization
In the past, the H2O2 are used as oxidant when Ti-based materials as a catalyst at room conditions. But H2O2 suffers for high cost and safety concerns. Replacing H2O2 with O2 has been highly desired. In this work, Ti-based bi-MOFs, MIL-125(Ti)@NH2-MIL-125(Ti) are synthesized through internal extended growth of MIL-125(Ti) on NH2-MIL-125(Ti). This Ti-based bi-MOFs, performed in sequence to synergistically catalysis effects for oxidative desulfurization (ODS) reaction with O2. For this bi-MOFs catalyst, MIL-125(Ti) are embed partly in and well distributed on the surface NH2-MIL-125(Ti). NH2-MIL-125(Ti) serves as a catalyst for the production of H2O2 from O2/methanol under visible light, MIL-125(Ti) is used as a ODS catalyst. The ODS over the MIL-125(Ti) are most effective for the in situ generated H2O2 could been used fully, consumed H2O2 (ODS reaction) also promote the H2O2 production for Le Chatelier's principle. MIL-125(Ti) and NH2-MIL-125(Ti), are in closed proximity on bi-MOFs materials, this leads to the catalytic efficiency is increased by 2.5 times in comparison to their physical mixture.