preferred bleaching catalysts are oxaziridinium-based bleach catalysts, transition metal bleach catalysts and bleaching enzymes. Without wishing to be bound by theory, the stability and efficiency of these bleach catalysts are improved by the low pH of the wash liquor...
(Phys.org)—From petroleum refining to food processing, the vast majority of commercial chemical applications involve catalysts to control the rate of chemical reactions. Anything that can increase the efficiency of catalysts could have a widespread impact in these areas. In a new study, scientists ...
2017. Recovery of rare earth elements from spent fluid catalytic cracking catalysts using leaching and solvent extraction techniques. Hydrometallurgy 167: 183–88. [Google Scholar] [CrossRef] Zheng, Biao, Yuquan W. Zhang, Fang Qu, Yong Geng, and Haishan Yu. 2022. Do rare earths drive ...
南京大学研究生毕业论文中文摘要首页用纸T_T-__i毕业论文题目:丛麴鲞簦负盐垫遮金星堡垡型垄氢:睦宣垦塑窒2QQ鱼级博士生姓名:指导教师(姓名**称):堂爱氐整筮碳纳米管独特的一维中空结构、优良的电学性质、大的比表面,以及强的吸附性能都赋予其作为催化剂载体的良好条件。大量的研究表明,碳纳米管作为催化材料...
摘要 摘要 由于其独特的结构和反应活性,炔丙基类化合物成为广受关注的反应中间体。炔丙 基类化合物的碳碳三键可以灵活方便地转化为其它官能团;还可与金属络合活化炔丙 位,以利于亲核试剂的进攻。这使得炔丙基类化合物的取代反应在有机合成中占有重要 位置。 在催化剂的作用下,芳香化合物可与炔丙醇发生亲核取代生...
Mechanicalstrength机械强度Thermalconductivity导热性 materialsscienceisaninterdisciplinarystudythatcombineschemistry,physics,metallurgy,engineeringandveryrecentlylifesciences.Oneaspectofmaterialssciencesinvolvesstudyinganddesigningmaterialstomakethemusefulandreliableintheserviceofhumankind. 材料科学是一门交叉学科,研究内容包括化学...
9H-carbazole-3-carbaldehyde scaffold,differinginthepositionofthemethoxygrouponringC (Fig.1). Therearemanystrategiesforthesynthesisofcarbazoles. However,thecyclodehydrogenationofdiarylaminesusing palladium(II)ascatalystiswidelyusedduetoversatilityand practicalityofthismethod. 8 Othertransitionmetalscatalysts,such as...
treatmentsofsystemscontainingtransitionmetals hasbeenmuchfasterduringthepastfewyearsthan anyonecouldhaveexpected.Onlyfiveyearsago,the treatmentoftheseveredynamicalandnondynamical correlationeffectsseemedalmostimpossiblydifficult evenforsmalltransition-metalcomplexes,andtoday thereareanumberofstudiesusinghigh-accuracy methods...
(PEMFC)has become the research focus for the national researCh workers,but the high price and low catalysis activity make PEMFC commercial difficultly limiting the further development of PEMFC.In this paper the novel COre—shell electrocatalysts which are synthesized by transition metals(Cu,Ag)as the...
anditishighsurfaceareametalsand metaloxidesthatareresponsibleforthemostindustri- allyimportantheterogeneouscatalyticreactions.Any meansofgaininginsightintothemechanismofthese reactionsmayproveusefulindesigningmoreefficient andmoreselectivecatalysts.Theabsenceofsurfaces, solvents,andcounterionsmakethegasphaseaconsid- era...