排序方式: 共有20条查询结果,搜索用时 15 毫秒
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热处理对La_(0.9)Nd_(0.1)(NiCoMnAl)_5电极性能的影响 总被引:3,自引:0,他引:3
研究了热处理对La0.9Nd0.1(NiCoMnAl)5电极材料结构、成分、脱氢压力-组成等温曲线(PCT)、循环寿命的影响。X射线衍射结果表明热处理降低了评价主相峰的半高宽(FWHM)平均值,即降低了晶格应力。采用JSM-840能谱分析仪对热处理前后合金成分进行分析,发现热处理使得合金中的La、Mn向晶内扩散,而Ni、Co、Al却向晶界偏聚。测定了室温下热处理前后的合金脱氢PCT曲线及其电极循环寿命曲线,结果表明热处理使电极放电容量有所降低,同时却又使电极循环寿命有所提高,并且还降低了合金平衡压。 相似文献
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柴油车排放的碳烟颗粒和NOx严重危害环境和健康,开发和应用柴油车排放后处理技术势在必行。总结了尾气后处理技术中碳烟颗粒在NOx储存催化剂上燃烧的技术发展路线以及研究进展,包括几种不同贵金属型和稀土混合氧化物型催化剂,同时归纳了其催化作用机理,并对NOx物种对碳烟燃烧活性影响进行归纳分析,对该技术在实际应用中存在的问题和应用前景进行了讨论。 相似文献
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贮氢合金应用研究近况 总被引:10,自引:0,他引:10
本文综述了贮氢合金的应用研究近况。包括贮氢合金在氢的贮存,运输,净化,压缩,热泵,催化和二次电池等应用领域的现状和发展,指出了目前存在的问题及新型贮氢材料的发展方向。 相似文献
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CharacteristicsofLaPrNdElectrodesforNickelMetalHydrideBateriesJinHongmei,LiGuoxun,WangRuikun,WanChaoqun,(靳红梅)(李国勋)(王瑞坤)(王超... 相似文献
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采用浸渍法合成了Pd负载的MgAlO水滑石基复合氧化物,通过NO2气氛的程序升温氧化(NO2-TPO)和预先存储氮氧化物(NOx)后程序升温氧化手段对催化剂催化碳烟燃烧的活性做了研究,同时通过氮氧化物程序升温脱附(NOx-TPD)对催化剂的存储氮氧化物的能力做了研究。结果表明:当有NO2参与碳烟反应时,催化剂催化碳烟燃烧的活性比以往在空气中的活性好,样品Pd/MgAlO存储NOx后再进行程序升温氧化发现催化碳烟燃烧的活性相比NO2气氛下的活性又有很大提高;预先存储NOx的Pd/MgAlO催化剂活性远远高于MgAlO,归因于催化剂负载Pd后NOx存储能力大大增强。 相似文献
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研究了稀土元素,粉碎工艺和粒度对REB5(B5=Ni(3.55)Co(0.75)Mn(0.4)Al(0.3))合金放电容量的影响。结果表明:(1)钕取代部分镧的La(1-x)B5合金在.x=0.2处放电容量有一极大值。而镨取代部分镧的La(1-x)PrxB5合金在x=0.15处放电容量有一极大值.CeNdB5合金放电容量很低,几乎没有实用价值;(2)La(0.65)Nd(0.2)Pr(0.15)B5合金颗粒尺寸在54~74μm和30μm以下具有较高的放电容量。 相似文献
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A series of MnMgAlO samples with different amounts of Ce doping were facilely prepared using coprecipitation method and their catalytic soot combustion activity was evaluated by temperature programmed oxidation reaction(TPO).The methods of X-ray diffraction(XRD),Brumauer-Emmett-Teller(BET),H2-TPR,NO-TPO and in situ IR were used to characterize the physiochemical properties of these samples.Dopant Ce improved the soot combustion performance of MnMgAlO catalyst due to the enhanced redox ability.Introduction of NOx led to the further increase of catalytic soot oxidation activity on these samples.Over Ce-containing samples,the catalytic activity was slightly decreased as the amount of dopant Ce increased in O2.Differently,in NO+O2,a certain amount of dopant Ce was much more favorable and excess amount of Ce resulted in a sharp drop of the catalytic soot combustion activity.Both NO2 and nitrates were found to have great contributions to the effects of NOx on the soot combustion activity of Ce-doped catalysts.More NO2 was generated as dopant Ce increased.When appropriate amount of Ce was introduced,the as-formed NO2 was stored as bridging bidentate nitrate on Mn-Ce site,which was confirmed to have higher reactivity with soot than nitrite or monodentate nitrate on Mn and/or Ce sites.Overall,Mn0.5Mg2.5Ce0.1Al0.9O was considered as the most potential catalyst for soot combustion. 相似文献