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Preparation and Performance Evaluation of Monolithic Catalyst for the Catalytic Combustion of Lean Vocs

Author: WangTianMing
Tutor: LiJianWei
School: Beijing University of Chemical Technology
Course: Chemical processes
Keywords: Monolith catalyst Catalytic combustion Low concentrations of organic matter Flow reversal
CLC: O643.36
Type: Master's thesis
Year: 2009
Downloads: 78
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Abstract


Low concentrations of volatile organic compounds if not dealt with directly shorting on atmospheric cause serious pollution , and low concentration of methane direct vent cause serious pollution to the atmosphere , it is also a waste of resources . In this paper, a low concentration of organic matter and low concentration methane catalytic combustion removal of objects , to carry out the the monolithic catalyst preparation and performance evaluation studies . XRD characterization and experimental studies combined , the system examines the Ce / Zr additives, Pd on the active component , the catalyst preparation methods and processes of VOCs catalytic combustion the monolithic catalyst performance impact , determined to pansy cordierite ceramic honeycomb carrier is a first carrier, and the aluminum oxide as a second carrier , the Ce / Zr molar ratio of 3:1 communion additives, using the load of 0.1 % of the active ingredient in the precipitation method , and then with hydrazine hydrate the step and the step of reduction treatment, calcination of the catalyst as the catalyst formulations and preparation process . Experimental Investigation of the monolithic catalyst prepared as containing alcohols, esters, and polyacene-based organic exhaust gas treatment effect . And low concentrations of toluene , for example , the effects of the concentration of organic matter , reaction temperature and operating airspeed for the preparation of catalyst performance . Based on the preparation of the overall catalyst and single - factor experiment , the system examines the impact of the operating conditions of concentration , temperature , and space velocity of low concentration methane catalytic combustion process , the results show that when the reaction temperature above 430 ℃ , airspeed 20000h -1 or less, and can ensure that the methane conversion rate reached 90% or more . To the preparation of catalyst -based and low concentration methane catalytic combustion as a model reaction , to carry out a flow reversal catalytic combustion experimental study to investigate the commutation cycle , operating airspeed and methane concentration monolithic catalyst performance and methane conversion rate , the results indicate that the commutation period , concentration of reactants and airspeed are three important operating parameters , a significant effect on the axial distribution of the temperature within the reactor , monolithic catalysts may be prepared to ensure that the methane concentration in the feed be less than 0.5 vol % of the cases , able to maintain the balance of self-heating .

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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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