Abstract
In order to achieve ultra-low sulfur fuel production, it is essential to design highly efficient catalysts for deep desulfurization. In this work, trivacant Keggin-type tungstophosphate PW9 (Na9[A-PW9O34]•7H2O) was innovatively utilized to synthesize polyoxometalate-based supported silica C16-PW9/SiO2. The intact presence of polyoxometalates (POMs) was evidenced by several techniques of describing the structure and composition of the obtained hybrid samples. Compared with the saturated tungstophosphate ([PW12O40]3−), the [A-PW9O34]9− showed better coordination, which can coordinate with five ILs (C16MIM). More ILs make it easier for the catalyst to attract DBT to the vicinity of PW9, and the abundance of metal oxide W = O on PW9 endows the catalyst’s excellent catalytic activity. Specifically, C16-PW9/SiO2 exhibited excellent oxidative desulfurization performance, achieving 100 % dibenzothiophene (DBT) conversion efficiency at 50 °C for 10 min, and the turnover frequency (TOF) number reached 723.4 h−1, which is higher than the catalysts of the POMs type that have been published. The strategy of combining lacunary polyoxometalates with ionic liquids offers a fresh viewpoint on the creation of POM-based catalysts.
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