研究目的
To develop an effective and efficient technology for reducing Hg emission from coal-fired power plants by using TiO2 catalyst in an internal-illuminated honeycomb photoreactor.
研究成果
A novel Hg0 removal technology from flue gas by using TiO2 catalyst in an internal-illuminated honeycomb photoreactor was developed. The catalyst presented excellent Hg0 removal performances in a wide of temperature of 25-90 oC, and 1.5 mW/cm2 of UV light irradiation was enough for Hg0 photocatalytic removal. Above 70% photocatalytic Hg0 oxidation efficiency was maintained during prolonged use.
研究不足
The technical and application constraints of the experiments include the potential interference of flue gas impurities like SO2 and NO on the photocatalytic activity, and the need for further optimization to decrease the superhydrophilicity of TiO2 for less adsorption competition from H2O for Hg0 adsorption.
1：Experimental Design and Method Selection:
A dip-coating method was used to immobilize the photocatalysts (TiO2) on the honeycomb internal channels wall. The TiO2 precursor solution was prepared by thermal hydrolysis method.
2：Sample Selection and Data Sources:
The ceramic honeycomb was purchased from Chauger Honeycomb Ceramics Co. Ltd. (Taiwan). The substrate of ceramic honeycomb was cordierite.
3：List of Experimental Equipment and Materials:
The BET surface area and pore structure characteristics of samples were determined by N2 adsorption isotherms (ASAP 2020 porosimeter). The crystal structure was studied by powder X-ray diffraction (XRD, X’Pert PRO diffractometer). The UV-vis absorption property was studied using UV-vis spectrophotometer (Lambda 35, Perkin–Elmer). The surface morphology was studied by environmental scanning electron microscope equipped with energy dispersive X-ray spectroscopy (ESEM-EDS, QUANTA 200).
4：0). Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The simulated flue gas (SFG) consisted of 4% O2, 12% CO2, 50 ppm SO2, 50 ppm NO, 10 ppm HCl, 6% H2O, 60 μg/m3 Hg0 vapor and N
5：The total flow rate of SFG was 2 L/min. The gas hourly space velocity (GHSV) was about 2250 h-Data Analysis Methods:
The Hg0 removal performance was evaluated by the instantaneous Hg0 removal efficiency (ET-i) and accumulated Hg0 removal efficiency (ET-a).
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