ZnS粒径对其氧化行为及产物ZnO脱硫再生循环性能的影响OA

Zinc oxide(ZnO)is widely used as a precise desulfurization agent in industrial processes,but its regeneration is difficult,making recycling challenging.Existing studies mainly focus on the effects of operating conditions,such as temperature,oxygen concentration and space velocity,on the regeneration rate,composition and structure of ZnO.However,the effect of the particle size of the desulfurization product zinc sulfide(ZnS)on the cyclic desulfurization-regeneration performance of ZnO remains unclear.ZnS samples with different particle sizes(13.98 nm,18.48 nm and 33.00 nm)were prepared via a hydrothermal method,and oxidative regeneration/desulfurization cycle tests were conducted.Characterization techniques including XRD,N2 adsorption/desorption and XPS were used to compare the composition and structure of the samples during three oxidative regeneration cycles,and to investigate the effect of ZnS particle size on the cyclic desulfurization-regeneration performance of ZnO.The results show that ZnS particle size has a significant effect on the oxidation regeneration rate,the crystallite size and the textural properties of regenerated ZnO.Smaller ZnS particles lead to faster oxidation regeneration,with the oxidation time shortened by up to 60 min,and produce regenerated ZnO with smaller crystallite sizes and larger specific surface areas,resulting in higher desulfurization activity during the oxidative regeneration/desulfurization cycles tests.However,after three cycles,ZnO regenerated from small-particle ZnS exhibits the largest increase in crystallite size(68.7%),the greatest decrease in specific surface area(29.0%),and generates the most zinc sulfate(ZnSO4),thereby showing the largest decrease in desulfurization performance(32.6%).