简介：Inthispaper,anabinitio,localdensityfunctional(LDF)methodwasusedtoexploretherelationshipbetweenthemolecularpropertiesofadditivesandthelubricatingperformanceofaluminumrollingoil.Thestructuralpropertiesofbutylstearate,dodecanol,docosanol,andmethyldodecanoatewerestudiedaccordingtothedensityfunctionaltheory.Thecalculateddatashowedthattheatomsinoraroundthefunctionalgroupsmightbelikelythereactingsites.Becauseofthedifferentfunctionalgroupsandstructureofesterandalcohol,twotypesofcomplexadditives,dodecanolandbutylstearate,methyldodecanoateandbutylstearate,respectively,werechosenforstudyingtheirtribologicalpropertiesandperformingaluminumcoldrollingexperiments.Thetestresultsagreedwiththecalculatedresultsverywell.Thecomplexester,viz.methyldodecanoateandbutylstearate,hadthebestlubricatingperformancewithafrictioncoefficientof0.0841andapermissive-rollingthicknessof0.040mmascomparedwiththatofdodecanol-butylstearate-baseoilformulation.

简介：Amorphousnickelbasedalloycatalysts(denotedastheSRNAseriescatalysts)werepreparedviarapidquenchingmethodfollowedbyalkalileachingandotheractivationprocedures.Thephysicochemicalcharacterizationsshowthatnickel,theactivecomponentinthesecatalysts,existsintheamorphousstate,andthecatalystparticlespossessmanynanosizedvoidsleadingtolargesurfacearea(thehighestis145m2/g).TheevaluationresultsinsomemodelreactionsshowthattheSRNAseriescatalystshave2to4timeshigheractivityandselectivitythanconventionalRaneyNicatalystforthehydrogenationofcompoundswithunsatur-atedfunctionalgroups.Atpresent,theSRNAseriescatalystshavebeensuccessfullyusedinhydrogenationofglucose,hydrogenationofpharmaceuticalintermediatesandpurificationofcaprolactam.Inordertousethesecatalystsefficiently,amagneticallystabilizedbed(MSB)technologyhasbeendevelopedbycombiningtheferromagneticpropertyofthecatalystwiththegoodmasstransfercharacteristicsofMSB.ThedemonstrationunitofMSBhydrogenationtechnologyhasbeensetupandhaskeptrunningfor2800hours.Theresultsshowthat,afterrunning2800hours,thecatalyststillretainedgoodactivity;meanwhile,thehydrogenationeffi-ciencyhadbeenimproved10timesincomparisonwiththetraditionalCSTRprocess.

简介：以苯甲醛和正丙醛为原料，KF/Al2O3为催化剂，聚乙二醇为相转移溶液，合成了α-甲基肉桂醛,考察了原料摩尔比、反应时间、反应温度、催化剂用量等对收率的影响，确定了最佳反应条件。

简介：用固体碱[Mg（Al）O]负载金属氧化物（Co2O3）作催化剂，在常压下催化分子氧氧化正丁硫醇向二硫化物转化。实验考察了镁铝摩尔比、催化剂焙烧温度及活性组分钴含量与催化剂活性的关系，还考察了反应温度和溶剂对正丁硫醇氧化反应的影响。结果表明，Co2O3／Mg（Al）O具有较好的催化活性和稳定性。在镁铝摩尔比3：1、Co含量8％、活化温度600℃条件下制得的催化剂活性最好。常压下用Co2O3／Mg（Al）O催化分子氧氧化正丁硫醇的适宜反应条件为：甲醇作溶剂，反应温度40℃。用IR、UV对正丁硫醇的氧化产物的结构进行了表征。

简介：研究了Pd/Nb2O5—Al2O3催化剂的制备方法及用于丙酮加氢合成MIBK的催化性能。实验结果表明,在反应温度160℃,反应压力4MPa条件下,丙酮单程转化率为40％,MIBK选择性为92％。

简介：Throughimprovingtheagingprocessduringsynthesisofthesupport,γ-Al2O3withlargeporevolumeandhighsurfaceareawassynthesizedbyafacilesecondaryreformingmethod.Thesynthesisparameters,suchasthereactiontemperature,thefirstagingtemperatureandthesecondagingtemperature,wereinvestigated.Thetexturalpropertiesofγ-Al2O3werecharacterizedbymeansofN2adsorption-desorptionisotherms,X-raypowderdiffractometry(XRD),scanningelectronmicroscopy(SEM),Fouriertransforminfrared(FTIR)spectroscopyandthermogravimetry(TG).TheexperimentalresultsindicatedthatAACHandamorphousAlOOHweretheprecursorsofalumina,whichwereformedviaprecipitationfromsolutionsafterreactionofaluminumsulphatewithammoniumhydrogencarbonate.Theprecursornanocrystallitesgrewandre-assembledduringthesecondaryreformingprocess,whichresultedinanincreasedporesizeandporevolumeandadecreasedbulkdensity.Theas-synthesizedγ-Al2O3materialsfeaturedmeso/macroporosity,largeporevolume(2.175cm3/g),highsurfacearea(237.8m2/g),andlowbulkdensity(0.284g/mL).

简介：Al（0H）3是环境友好的阻燃剂。由于Al（0H）3与高分子界面相容性差，所以在高分子基相中容易团聚。在以往关于粒径小于100nm或粒径在几到几十微米的Al（OH），填充聚烯烃的研究中，实验结果多是Al（OH）3填充使聚烯烃的冲击强度、拉伸强度均降低。

简介：为提高聚丙烯（PP）的导热性能，填充型导热PP复合材料已有不少研究。其中，有的研究表明：随铝粉含量增加，PP拉伸强度和冲击强度下降；铝粉粒径越大，拉伸强度降低越明显。铝粉体积含量小于15％时，PP的热导率随铝粉体积分数增加而线性提高，但不明显。铝粉体积含量超过15％时，PP的热导率提高明显。当体积含量接近30％时，PP热导率达到3．16W／（m·K），是纯PP树脂的14倍。因此认为铝粉用量高时，铝粉间形成导热链。导热填料会影响聚合物基体的结晶程度和结晶区的大小，从而影响材料的热导率。

简介：用SO4^2-／TiO2-Al2O3固体超强酸作催化剂催化合成甲酸乙酯，考察了催化剂的活化温度、催化剂用量、反应物配比对酯化反应的影响。结果表明，SO4^2-／TiO2-Al2O3固体超强酸是合成甲酸乙酯的良好催化剂，并且可以重复使用。在醇酸摩尔比2：1、催化剂用量（以每摩尔甲酸计）2g、反应时间4h的最佳条件下，甲酸乙酯的产率可达99．5％。