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Preparation of Plate V2O5/TiO2 Catalysts and Their Performances for Selective Catalytic Reduction of NO by NH3

Author: ZhangChunYan
Tutor: LiuQingYa
School: Beijing University of Chemical Technology
Course: Chemical Engineering and Technology
Keywords: SCR Denitrification Plate catalyst V2O5/TiO2
CLC: X701
Type: Master's thesis
Year: 2011
Downloads: 172
Quote: 1
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Abstract


Coal is China's major primary energy, about 80% of the dust for combustion for power generation and heating emissions, S02 (sulfur) and NOx (saltpeter) is the largest source of air pollution in China. Dust removal and desulfurization technology popularization and application of strengthening in the \In recent years, the rapid growth of the amount of coal led to the increasing NOx emissions of more than 10 million tons in 2010, the grim situation of environmental pollution. Therefore, the coal-fired NOx emission control China's \for N2 and emissions. Commercial SCR catalyst for cellular V2O5/TiO2 based catalysts, the market share of more than 75%, the domestic introduction of a number of production lines. Honeycomb production difficult, the disadvantage of poor anti-dust, foreign development plate of V2O5/TiO2 base catalyst, the production techniques mastered by the Babcock-Hitachi, Japan, and Germany Argillon company, reported that there is no domestic production. In view of the plate catalyst not only high activity, but also suitable for the characteristics of China's coal-fired flue gas dust content, the proposed plate the V2O5/TiO2 catalyst preparation research papers, and strive to form with independent intellectual property rights, high-efficiency, high-strength, low-cost plate catalyst preparation techniques. Aiming of the characteristics of the raw material source (TiO2 powder, binder, etc.), the first V2O5/TiO2 based catalyst formulations and preparation process; on the basis of establishing the basic recipe, exploring the molding process of the plate catalyst, and flue gas conditions and operating conditions of the self-made catalyst performance, draw the following conclusions: (1) domestic ultra-fine titanium powder is not suitable to do denitration catalyst carrier, but denitration catalyst the domestic nano titanium powder and titanium powder imported prepared activity equivalent denitrification rate of more than 85%; specific surface area of ??nano titanium powder, is conducive to the active component V2O5 support interaction, making V V4 relative content denitration catalyst activity; ultrafine titanium powder ratio surface area is small, is not conducive to V2O5 and TiO2 interaction, the main V to V5 to cause catalyst denitration low. (2) preparation of mud add ammonia to reduce SO2 oxidation catalyst, but also reduces the rate of NO removal; the catalyst suitable calcination temperature range of 400-600 ° C; improve V2O5 loading denitrification rate and SO2 oxidation rates improve either, suitable amount of the vanadium is 1-2%; on NO removal ratio of WO3 little effect, but the SO2 oxidation can be suppressed; of WO3 content of 5% in order to control the SO2 oxidation, the oxidation rate of SO2 can meet industrial requirements; an organic binder or an inorganic binder, the type of activity of the catalyst has little effect. (3) the higher the H2O content in the flue gas denitrification rate and SO2 oxidation rates were lower;, NO removal rate decreased slightly with increasing O2 content in the atmosphere, SO2 oxidation rate changed little; airspeed 1000 -7015 h-1, the active site of the self-made catalyst is sufficient, the greater the airspeed, lower SO2 oxidation rate; (4) as the reaction temperature increased from 300 ℃ to 450 ℃, NO removal rate changed little, but SO2 oxidation rate; NH3/NO ratio increased from 1.0 to 1.1, denitrification rates improve, continue to improve the NH3/NO than denitrification rates will vary small the best NH3 amount of the active site of the catalyst surface much about; NH3/NO than SO2 oxidation catalyst has little effect; SO2 denitration activity and NH3/NO related NH3/NO (?) (?) inhibited inhibition disappeared NH3/NO high; due to the flue gas SO2 sulfurization of the catalyst, the catalyst the denitration activity gradually increased, and the stability with the stability of the nature of the catalyst surface. (5) The glass fibers can significantly improve the plate strength of the catalyst to prevent the catalyst from falling; order to protect the activity and strength of the catalyst, an inorganic binder is added in an amount of 20%; the catalyst mud aged for 5 days, then each component substantially uniform distribution, the higher the overall strength of the catalyst is in the molding of 8 MPa, the molding pressure is less than 8 MPa, the strength of the catalyst is poor; humidification and drying the resulting catalyst powder serious phenomenon, by contrast, ordinary drying superior humidification and drying, which point dried honeycomb catalyst. (6) plate V2O5-WO3/TiO2 catalyst formulations (mass fraction): 65% TiO2, 1.55% V2O5, 8% WO 3, 5% of glass fiber, 20% of bentonite, 5% HPMC (firing LOI to calcination The quality of the catalyst after baseline). Mud aging 5 days at 8 MPa molding, after the 450 ° C calcined 5h obtained plate catalyst at 110 ° C drying 2H. The the the homemade plate catalyst overall thickness of 0.7 mm, 2 h the wear rate of 0.48%, the imports plate catalyst; denitrification rate of 81% at 400 ° C, with imports the plate catalyst for the considerable; SO2 oxidation rate is significantly lower than the imported catalyst (1.4% vs.5%)

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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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