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Study on Denitrification Technology for Middle-low Temperature Flue Gas by TiO2 Composite Catalysts Loaded V2O5/CuO

Author: ZuoPing
Tutor: LuoJianZhong；ZuoChaoPing
School: Guangdong University of Technology
Course: Environmental Engineering
Keywords: V2O5 CuO TiO2 Catalyst In the low-temperature flue gas Denitrification Selective Catalytic Reduction
CLC: X701
Type: Master's thesis
Year: 2011
Downloads: 178
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Abstract


Industrial furnace flue gas with high fly ash content, the S02 and NOx concentration high and low flue gas temperature (200 ~ 300 ℃), the traditional commercial SCR (Selective Catalytic Reduction Selective Catalytic Reduction) DeNOx catalyst activity high temperature , narrow range (350 ~ 450 ℃), and therefore can not be applied to industrial furnace flue gas denitrification conditions. NOx selective catalytic reduction of stationary source emissions denitrification technology is currently the most widely used in industrial applications, and mature. Lack of status quo for the industrial furnace flue gas denitrification technology, research and development in low-temperature flue gas conditions apply to the SCR DeNOx technology has broad application prospects for its core research and development of low-temperature SCR DeNOx catalyst. This thesis uses the method of combinatorial chemistry for synthesis of a dipping method, a supported transition metal composite oxide in the low temperature selective catalytic reduction of NOx activity evaluation, study screening carried out the denitration performance has better low temperature SCR VCu/TiO2 series catalyst . The series of catalysts were prepared by impregnation of VCu/TiO2 system study found that 2V16Cu/TiO2 (500) (2V and 16Cu, respectively of V2O5, CuO accounted for 2% and 16% of the entire catalyst mass calcination temperature of 500 indicates 500 ° C) catalyst show the best low temperature denitration activity and a wide active temperature range, in airspeed GHSV = 6.0 × 104h-1, 225 ℃ under the conditions of NOx conversion rate reached 97.3%, and reaches 100% at 250 ° C, the temperature was raised to 300 ℃ catalytic activity remained at 100%; After the reaction temperature was 250 ° C, the space velocity was 60000h-1 and other conditions, which leads to SO2 (volume fraction of 0.06%), the introduction of metal vanadium oxide prepared 2V16Cu/TiO2 (500) catalyst anti-sulfur performance improvement 16Cu/TiO2 (500); were characterized by XRD, TPR, Raman, XPS characterization techniques to further characterize the catalysts, CuO is one of the major active component of the catalyst, which low-temperature catalytic activity important factor; increase in copper content is conducive to the formation of crystals of CuO and the improvement of the NOx conversion rate; surface enrichment appropriate V5, V4 and Cu2 conducive to the improvement of low temperature SCR DeNOx activity. Although VCu/TiO2 Series catalyst rendering a higher low-temperature activity, but its sulfur resistance poor, modified on VCu/TiO2 series catalyst, synthesized by the method using combinatorial chemistry dipping method, load type ternary metal composite oxide material in low temperature selective catalytic reduction of NOx activity evaluation, screened VCuMn/TiO2 series and VCoMn/TiO2 series for the follow-up study of the papers. A catalyst for a preliminary study of VCuMn/TiO2 found different Cu / Mn ratio VCuMn/TiO2 catalyst in 2V2Cu8Mn/TiO2 (500) and 2V8Cu2Mn/TiO2 (500) of the low-temperature DeNOx activity better in airspeed 6.0 × 104h-1, 200 ℃ when NOx conversion rate of more than 70%, 2V2Cu8Mn/TiO2 275-325 ℃ NOx100%, conversion of 300 ℃, 2V8Cu2Mn/TiO2 NOx also completely transformed. In addition, the series catalyst sulfur resistance are improved, sulfur resistant catalyst 2V2Cu8Mn/TiO2 effect Preferably, the reaction temperature was 250 ° C, GHSV of 60000 h-1 and other conditions, which leads to SO2 (0.06%) 6 hrs after, NOx conversion was still more than 60%, stop leads to SO2 gas, its catalytic activity rebounded slightly. Preliminary study found 2V5Co5Mn/TiO2 (500) the best performance in the low-temperature SCR DeNOx catalyst, 225 ℃ NOx conversion rate of 87.1%, and then has remained at 90.0%, the active window wide the VCoMn/TiO2 series of catalysts. Its sulfur tolerance preliminary study showed that 2V2Co8Mn/TiO2 sulfur resistant catalysts 2V4Co6Mn/TiO2 and 2V5Co5Mn/TiO2 better performance, 1h after the NOx conversion rate of more than 75% than 90%, 4h.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Exhaust gas processing and utilization
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