Study on Vanadium-Molybdenum-Titanium-Based Catalyst for Low-Temperature De-Nitration and De-Chlorobenzene:Effect of Molybdenum Loading
In this paper,vanadium-molybdenum titanium-based catalysts with different molybdenum loading were pre-pared by impregnation method.The performance of the catalysts for denitration,SO2 oxidation and dechlorobenzene was evaluated.The catalysts were characterized by BET,XRD,Py-FT-IR,NH3-TPD,NO-TPD and SO2-TPD.The results showed that the specific surface area of the catalyst was relatively close,the active components were evenly dispersed on the surface of the TiO2 carrier,and no obvious XRD diffraction peak of the active species was found.In situ infrared adsorption of pyridine showed that the addition of molybdenum increased the number of B-acid and L-acid sites on the surfaceof the catalyst.The characterization of temperature-programmed desorption showed that with the increase of mo-lybdenum loading,themiddle-strong acidic sites on the catalyst surface increased slightly,which weakened the adsorp-tion capacity of the catalyst for NO and SO2.Therefore,the denitration and sulfur oxidation performance of the catalyst decreased gradually,and the performance of dechlorobenzene increased.The comprehensive performance of denitration and dechlorinationofthe catalyst is better when the molybdenum load is 6wt％.
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