Ce-Mn/ZrO2复合催化剂的制备及其固硫性能OA北大核心CSTPCD

SO2 released during sludge combustion causes significant environmental pollution.Sulfur can be fixed in the ash by adding a calcium-based sulfur-fixing agent,but the effect is limited because of its easy sintering at high temperatures.Herein,Ce-Mn/ZrO2 composite catalysts were prepared by coprecipitation method to improve the sulfur-fixing effect,and the composition and morphology of the catalysts were characterized by field emission scanning electron microscopic-energy dispersive spectroscopy(FESEM-EDS),transmission electron microscopy(TEM),X-ray diffraction(XRD),and X-ray photoelectron spectroscopy(XPS).Further,by mixing the catalyst with a calcium-based sulfur-fixing agent and sludge,high-temperature sulfur-fixing experiments were carried out on a sulfur determination device to study its sulfur-fixing performance.The results showed that the synthesis method of the catalyst could effectively disperse Ce and Mn elements in the carrier.The synergistic effect between Ce-Mn could promote a reaction to produce more oxygen vacancies,thereby promoting the conversion of SO2 to SO3.The sulfur fixation rate was as high as 72.60％when n(Ca)/n(S)=1.5,the content of Ce-Mn/ZrO2 catalyst was 3.5％and the combustion temperature was 1000 ℃.The results of the thermogravimetric analysis showed that the temperatures of sludge ignition were depressed as well as reaction activation energy,and the combustibility of sludge could be promoted after the agents were added.So that the sulfur fixation product could be stable.Ce-Mn/ZrO2 presents an excellent catalytic activity for sulfur fixation,so it has a broad prospect in enhancing sulfur removal in sludge combustion.