简介：Thesupportγ-Al2O3wastreatedwith1-methylnaphthaleneasthemodelreactantbyrespectivelyusingthechemicalstaticadsorptionmethodandtheacceleratedcokingmethodtostudythecokingsitesofγ-Al2O3surface.Thecarbonspeciesformedonγ-Al2O3surfacewereanalyzedbyCAT-CS,TG-MS,IR-OH,andPy-IRtechniques.TheresultsofcharacterizationbyCAT-CSandTG-MStechniquesindicatedthatthecarbonspeciesformedduringthechemicalstaticadsorptionprocessismainlycomposedofthereversiblyadsorbedcokeprecursorswithalowly-condensedstate,whilethatformedaftertheacceleratedcokingprocessisprobablyrelatedwiththeirreversiblyadsorbedcokedepositswithahighly-condensedstate.TheresultsofcharacterizationbyIR-OHandPy-IRtechniquesfurtherimpliedthattheformationofthetwokindsofcarbonspecies,i.e.,cokeprecursorsandcokedeposits,arecloselyrelatedwiththebasichydroxylgroupsandthestrongLewisacidsitesonγ-Al2O3surface.Theresultsleadtoadeepinsightintothecokingmechanismonthealuminasurface.

简介：1～5月，我国进出口总值累计11．63万亿元人民币，同比增长8．8％。其中，出口6．14万亿元，增长5．5％；进口5．49万亿元，增长12．6％；贸易差额6498．1亿元。5月份进出口总值同比增长8．6％。其中，出口增长3．2％，进口增长15．6％。

简介：OnSeptember2―7,2018,theserviceteamcomposedoftechnicalpersonnelfromtheSINOPECShanghaiResearchInstituteofPetrochemicalTechnology(SRIPT)andtheSINOPECNanjingCatalystBranchCompanyhadprovidedtechnicalservicetoloadingofethylbenzenecatalystEBC-1andstart-upoftheguardreactorina500kt/abenzene/ethylenealkylationplantoftheTianjinDaguChemicalCo.,Ltd.

简介：本文梳理回顾了我国1号、2号、3号喷气燃料标准的制修订背景和过程,分析比较了不同版本标准在检验项目、技术指标设置、文本和编排方式等方面的变化。喷气燃料的质量要求高,生产要求非常严格,检验项目也比汽、柴油更全面[1-7]。由于飞机飞行的特殊性,喷气燃料必须具备良好的使用性能和可靠的安全性。