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Studies On Mesoporous CuO-MOx/Ce-Zr-O2Catalysts For CO Preferential Oxidation In Rich Hydrogen

Posted on:2015-12-18Degree:MasterType:Thesis
Country:ChinaCandidate:J X CaiFull Text:PDF
GTID:2181330467461276Subject:Industrial Catalysis
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As the concept of the sustainable development is put forward, people graduallyrealize the importance of energy and environmental problems. The hydrogen, which isa high efficiency and near zero emission of energy source, became one of the mostpromising fuels at present. Fossil fuels will release plenty of greenhouse gas andwaste gas when they are burning. Proton exchange membrane fuel cell (PEMFC) isone of the most effective and important forms of hydrogen. Hydrogen-rich gas is thefuel of the fuel cell, because it contains a trace of CO and could result in Pt electrodepoisoning. So the service life of fuel cell will be reduced. The most effective methodof selective oxidation is removing CO from hydrogen-rich gas. The research ofnon-noble metal catalysts for CuO/CeO2is more extensive than others in selectiveoxidation catalyst. Because it shows well selective catalytic oxidation activity of CO.The study includes three kinds of preparation methods, such as the water hot-dipmethod, coprecipitation-dipping method and citric acid complexing-dipping method,and makes catalyst of CuO/m-CeO2-ZrO2. In addition, the influence of precipitatingagent content, CuO load, double metal load and double metal load on performance ofcatalyst for selective oxidation of CO is investigated. At last, we get some valuableresearch results.The studies have found that a catalyst of CuO/m-CeO2-ZrO2increases thespecific surface area of catalysts and increases the dispersion of CuO byco-precipitation-impregnation method; when NaOH and Na2CO3are used asprecipitant, the dispersion of CuO is improved in a certain extent, the reductiontemperature of CuO is reduced, the aperture of a catalyst is reduced, and specificsurface area of catalysts is increased. The suitable capacity of CuO improves theadsorption of CO on Cu1+interface and releases the reactivity of oxygen ions fromcarriers; the appropriate metal and CuO are loaded to CeO2-ZrO2, the sinteringphenomena of catalyst is improved by the synergy of the two metals; as aconsequence, the oxidation and reduction temperature of solid solution is reduced,specific surface area of catalysts, capacity of oxygen storage, restoring ability in lowtemperature and thermal stability are increased. To improve the catalytic performance. The study has shown that using co-precipitation-impregnation method,n(Na2CO3):n(NaOH)=0.1:1, the loading of CuO is7%,Al2O3as bimetallic load,mAl:mCu=0.36,under the conditions preparat7%CuO-2.52%Al2O3/m-Ce0.9Zr0.1O2will have good catalytic properties when Al2O3and CuO are supported at the sametime, and mAl:mCu=0.36. T50is91℃,T100is115℃,the selectivity of catalyst was100%at the time of CO fully converted。...
Keywords/Search Tags:CO preferential oxidation, CuO/m-Ce-Zr-O2, MOx-CuO/m-Ce-Zr-O2
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