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1、JournalofShandongUniversityofScienceandTechnology第28卷第5期Vol.28No.5542009年10月Oct.2009NaturalScience微晶碳在镁基复合储氢材料中的作用周仕学,杨敏建,马怀营,张同环,张光伟(山东科技大学化学与环境工程学院,山东青岛266510)摘要:为了提高金属镁的放氢动力学性能,将无烟煤经脱灰并碳化后制得的微晶碳添加到镁粉中,用氢气反应球磨法一步制得高性能镁碳复合储氢材料。用X射线衍射和红外光谱对微晶碳的结构进行了表征,用透射电镜、X射线能谱、粉末X射线衍射对储氢材料的结构进行了测试,用
2、差示扫描量热分析和P2C2T分析对材料的储氢性能进行了研究。结果表明,微晶碳具有类石墨晶体结构,对镁有良好的助磨作用,并与镁有协同吸氢和放氢作用。镁粉中添加40%微晶碳,球磨2h的粒度即可达到30～50nm,储氢材料的初始放氢温度可低至22714℃,储氢密度可达617%。关键词:无烟煤;微晶碳;镁;储氢材料中图分类号:TG139文献标志码:A文章编号:167223767(2009)0520054204TheEffectofMicroliticCarboninMg2basedCompositeHydrogen2storedMaterialsZHOUShi2xue,YA
3、NGMin2jian,MAHuai2ying,ZHANGTong2huan,ZHANGGuang2wei(CollegeofChemicalandEnvironmentalEngineering,SUST,Qingdao,Shandong266510,China)Abstract:Inordertoimprovethehydrogen2releasedynamicperformanceofmetalmagnesium,themicroliticcarbonpre2paredfromanthracitebydemineralizationandcarbonizatio
4、nwasusedtoaddintothemagnesiumpowderstoproducethemagnesium2carboncomposedhydrogen2storedmaterialswithhighperformancebyreactiveballmillingmethodunderhydro2genatmosphere.ThestructureofmicroliticcarbonwascharacterizedbytheX2raydiffractionandinfraredspectrum,andthatofthehydrogen2storedmater
5、ialwastestedbythetransmissionelectronmicroscope,X2rayenergyspectrum,andpow2derX2raydiffraction.Theperformanceofhydrogen2storageformaterialswasinvestigatedbydifferentialscanningcalorime2tryandp2c2Ttest.Theresultsshowthatthemicroliticcarbonisofsimilarstructuretographite,thecarbonactsasmi
6、llingaidformagnesiumpowderduringballmilling,andthesynergisticeffectforhydrogenationanddehydrogenationoccursbe2tweenmagnesiumandmicroliticcarbon.Withtheadditionof40%ofmicroliticcarbon,themagnesiumparticlesaremilledto30～50nmin2handtheinitialdehydrogenationtemperatureoftheresultedhydrogen
7、2storedmaterialdecreasesto22714℃aswellasthehydrogen2storeddensityisupto617%.Keywords:anthracite;microliticcarbon;magnesium;hydrogen2storedmaterial储氢材料可用作氢燃料电池汽车的氢源材料,还可为合成气加氢脱硫、油料加氢精制、重油加氢裂化、煤3加氢液化等提供高活性氢。金属镁资源丰富,密度小(1174kg/m),储氢密度大(理论值可达7160%),是很有潜力的储氢材料;但其吸氢和放氢温度高,动力学性能差。WU等在镁中添加碳纳
