A highly efficient catalyst that converts propane gas into heavier hydrocarbons has been developed by saudi arabia's king abdullah university of science and technology (kaust) researchers it significantly speeds up a chemical reaction known as alkane metathesis, which could be used to produce. That alkane metathesis could be used to cleave pe chains here, we report a mild and efficient degradation of pe into liquid fuels and waxes using inexpensive and. Discusses olefin (alkene) metathesis reactions part of an organometallic hypertext. Moved permanently the document has moved here. Alkane metathesis via tandem catalysis - ebook download as pdf file (pdf), text file (txt) or read book online.
Alkane metathesis organoiridium complexes catalyze the dehydrogenation of alkanes and alkyl groups, a transformation with tremendous potential applicability for example, alkane dehydrogenation in tandem with olefin metathesis results in alkane metathesis. Alkane metathesis and other tandem systems for catalytic hydrocarbon transformation olefins are ubiquitous as intermediates in the petrochemical, commodity chemical. Silica and alumina supported tantalum and tungsten hydrides were tested in alkane metathesis, for comparison of their catalytic properties in propane metathesis [w]–h/al2o3proves to be twice more. Olefin metathesis, or alkene metathesis, is an important process in petroleum refining and in the synthesis of important compounds such as pharmaceuticals the mechanism of olefin metathesis is related to pericyclic reactions like diels alder and [2+2] reactions. A method of converting at least one first alkane to a mixture of at least one low molecular weight alkane (optionally also including additional lower and/or higher molecular weight alkanes) and at least one high molecular weight alkane, comprising: reacting a first alkane in the presence of dual catalyst system comprising a first catalyst (ie.
Polyethylene (pe) is the largest-volume synthetic polymer, and its chemical inertness makes its degradation by low-energy processes a challenging problem we report a tandem catalytic cross alkane metathesis method for highly efficient degradation of polyethylenes under mild conditions. Alkane metathesis is a novel catalytic and direct transformation of two molecules of a given alkane into its lower and higher homologues moreover, the process proceeds at relatively low temperature (ambient conditions or higher. These molecular catalysts are the first systems that effect alkane metathesis with molecular-weight selectivity. Alkane metathesis via tandem catalysis zheng huang a dissertation submitted to the faculty of the university of north carolina at chapel hill.
(703h) inorganometallic catalyst design: alkane metathesis catalysis in nu-1000 mofs functionalized with transition metals. Alkane metathesis (am) has potentially tremendous applicability via converting low-value alkanes (c3-c9) from the fisher-tropsch process into linear alkanes in the diesel fuel range (c10-c19) a well-defined and highly efficient tandem catalytic system for the metathesis of n-alkanes has been developed.
Alkane metathesis transforms small alkanes into their higher and lower homologues the reaction is catalyzed by either supported d(0) metal hydrides (m = ta, w) or d(0) alkyl alkylidene complexes (m = ta, mo, w, re. Alkane metathesis in alkane metathesis acyclic alkanes are scrambled to higher and lower homologues with tantalum hydride supported on silica (sio 2)tah at temperatures of 25°c to 200°c in this reaction ethane is converted into. With petroleum supplies dwindling, there is increasing interest in selective methods for transforming other carbon feedstocks into hydrocarbons suitable for transportation fuel. Alkyne metathesis is an organic reaction involving the redistribution of alkyne chemical bonds this reaction is closely related to olefin metathesis.
Read from olefin to alkane metathesis: a historical point of view, angewandte chemie international edition on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Reacting a first alkane in the presence of a dual catalyst system comprising: (i) a hydrogen transfer catalyst and (ii) a metathesis catalyst to produce said mixture of at least one low molecular weight alkane and at least one high molecular weight alkane, said reacting step carried out at a temperature not greater than 300° c and in the. Alkane metathesis by tandem alkane-dehydrogenation-olefin-metathesis catalysis and related chemistry haibach mc(1), kundu s, brookhart m, goldman as author information: (1)department of chemistry and chemical biology, rutgers, the state university of new jersey, new brunswick, new jersey 08903, usa.
Evaluation of molybdenum and tungsten metathesis catalysts for homogeneous tandem alkane metathesis brad c bailey,† richard r schrock,,† sabuj kundu, ‡alan s goldman, zheng huang,. Alkane metathesis is a reaction that transforms an alkane (c n h 2n+2) or an alkane mixture into lower and higher homologues. Title = alkane metathesis by tandem alkane-dehydrogenation-olefin-metathesis catalysis and related chemistry, abstract = methods for the conversion of both renewable and non-petroleum fossil carbon sources to transportation fuels that are both efficient and economically viable could greatly enhance global security and prosperity. Download citation | alkane metathesis wi | by grafting tame5 on aerosil700, a stable, well-defined, silica-supported tetramethyl tantalum(v) complex, [(≡sio)tame4], is obtained on the silica surface. 1 i-j alkene metathesis i basic principles the nobel prize in chemistry 2005 yves chauvin institut français du pétrole, rueil-malmaison, france, robert h grubbs. Alkane metathesis alkane metathesis is a class of chemical reaction in which an alkane is rearranged to give a longer or shorter alkane product it is similar to olefin metathesis, except that olefin metathesis cleaves and recreates a carbon-carbon double bond, but alkane methathesis operates on a carbon-carbon single bond. Alkane metathesis via surface organometallic chemistry catalytic production of light olefins selective c-h bond activation and c-c bond functionalization.