Cationic Exchange of Evans‐Showell Polyoxometalate to Construct Efficient Hydrodesulfurization Catalyst

Abstract

In this paper, a simple cationic exchange method was proposed to increase the Co/Mo ratio in the Evans-Showell polyoxometalate to the desired 0.5 with both Mo and Co atoms in one molecule. This approach was proved successfully by X-ray diffraction, X-ray fluorescence spectrometer, infrared spectroscopy, and thermogravimetric analyzer. Then, the obtained Evans-Showell-type polyoxometalate was used as a superior precursor to construct efficient hydrodesulfurization catalyst, and the dibenzothiophene evaluation results showed that the hydrodesulfurization reaction turnover frequency, the rate constant, and the dibenzothiophene conversion are 1.8 × 10 À 3 s À 1 , 6.4 × 10 À 7 mol g À 1 s À 1 , and 95.2 %, respectively, illustrating the excellent hydrodesulfurization performance of the catalyst. The cationic exchange approach promises the Mo and Co atoms in one molecule and the desired proximity of them, leading to a higher dispersion of MoS 2 nanoparticles, a higher percent of CoMoS active phase and the excellent hydrodesulfurization performance for dibenzothiophene consequently.

Rice husk valorisation by in situ grown MoS2 nanoflowers: a dual-action catalyst for pollutant dye remediation and microbial decontamination

“…Faster photodegradation of MG using in situ grown DRH-MoS 2 might be due to the presence of porous delignified cellulose structures (DRH) and the presence of MoS 2 nanoflower, which provides sites for both adsorption of dye and catalytic degradation. 57 At first, MG is adsorbed onto the DRH-MoS 2 structures, aiding in the removal of the dye. Subsequently, the photocatalytic properties of MoS 2 lead to an improved overall performance.…”