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Copper vanadium molecular sieve catalyst activity conditions

Author: LinShan
Tutor: WangChengXue
School: Changchun University of
Course: Industrial Catalysis
Keywords: Nitrogen oxides and sulfur oxides Catalyst Conversion rate activity conditions
CLC: O643.36
Type: Master's thesis
Year: 2010
Downloads: 24
Quote: 0
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Abstract


The rapid development of industry brings economic benefits to society,which also caused great harm to the environment. Among them, the flue gas of sulfur oxides and nitrogen oxides is the main gas that pollutes the environment. For these "by-products of industrialization," we shall promptly take effective measures to control them.The subject of using ammonia selective catalytic reduction (SCR) technology to self-molybdenum-based catalysts modified CumVnOx/ZSM-5 as the research object, in the self-catalytic activity test reactor, we prepared the catalytic activity test,to study the catalyst composition and operating conditions how to impact on the catalytic activity, we use impregnated coprecipitation to prepare copper vanadium zeolite catalyst [1], and they were modified with molybdenum salt. the best conditions for the study were simulated at different reaction temperature conditions in the multi-phase fixed-bed reactor for flue gas simultaneous desulfurization and denitrification, they also simulate respectively at different the intake air flow, space time and reaction temperature conditions.Identified the best temperature of the removal of sulfur dioxide in the copper-vanadium-molybdenum-modified zeolite catalyst is for 440℃and 470℃, flow was 400ml/min, space-time is 0.7-1.1 s-1, the best space-time at the 0.8156 s-1 and 0.7936s-1, the optimum temperature of nitrogen oxides is 410℃space-time is 0.4-1.2 s-1, the best space-time is 1.1512s-1, the best removal rate of sulfur dioxide and nitrogen oxide is 99.08%,87.98%.According to the components of flue gas under the circumstances,the possible chemical reaction has been selected in this paper.To determine the number of independent reactions,we have obtained the standard state thermodynamic function values and the thermodynamic properties at different temperatures by the thermodynamic calculation,The feasible chemical reactions have been researched by the standard formation enthalpy of freedom,the standard Gibbs free energy change and the standard entropy change,and thus the result provides support for the further desulfurization denitration kinetics of flue gas.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic > Catalyst
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