1. Definition of Catalyst: A catalyst is a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change. It facilitates the reaction by providing an alternative pathway with a lower activation energy. 2. Types of Catalysts: - Positive Catalyst: ...
Chemistry: A catalyst for southern progressdoi:10.1080/01619564909536204A. M. HolladayPeabody Journal of Education
DFT calculations of the mechanism of polymerization for the series of catalyst models derived from CpTiMe2(NPR3) (R = Me, NH2, H, Cl, F) demonstrate the critical role of ion pairing in determining the overall barrier to polymerization and suggest that electron-donating substituents reduce this...
CATALYST AND PROCESS FOR PREPARATION OF TERMOELASTOPLASTIC POLYOLEFINS In particular the new catalyst combination and a process are useful and for preparing of super high molecular weight isotactic polymers and copolymers of monomodal Gauss like molecular weight distribution with both linear and cyclic olef...
Late transition metal catalyzed polymerization and/or copolymerization of unsaturated substratesviathe migratory insertion route is of great current in... KR Reddy - 《Dalton Transactions An International Journal of Inorganic Chemistry》 被引量: 0发表: 1999年 Metallocene Catalyst For The (Co)Polymerizati...
PURPOSE: A catalyst which is efficient in converting alkanes, alkenes, or alcohols to unsaturated aldehydes and acids, and a process for preparing unsaturated aldehydes and acids using the catalyst. CONSTITUTION: The catalyst is represented by the formula, AaMmNnXxOo, wherein 0.25<a<0.98; 0.003<...
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The invention relates to a catalyst containing rhodium and a compound of the general formula (I), in which R<1>, R<2> and R<3> are identical or different and independently of each other are hydrogen, an alkyl group or alkoxy group with 1 to 4 carbon atoms, an alkenyl group with 2...
摘要: The catalyst system including ligand (I) is successfully applied to the reaction of a broad spectrum of aldehydes with nitromethane and can be extended to a diastereoselective preparation of analogues (XIII) in the presence of nitropropane....
Applied Catalysis A: General publishes original papers and reviews on all aspects of catalysis of basic and practical interest to chemical scientists in both industrial and academic fields. Papers that focus on advances in … View full aims & scope ...