摘要:
A catalyst comprising particles of iridium oxide and a metal oxide (M oxide), wherein the metal oxide is selected from the group consisting of a Group 4 metal oxide, a Group 5 metal oxide, a Group 7 metal oxide and antimony oxide, wherein the catalyst is prepared by subjecting a precursor mixture to flame spray pyrolysis, wherein the precursor mixture comprises a solvent, an iridium oxide precursor and a metal oxide precursor is disclosed. The catalyst has particular use in catalysing the oxygen evolution reaction.
摘要:
The present invention is directed to dirhodium compounds and their use as catalysts in stereoselective syntheses. In particular, the dirhodium catalysts include ligands comprising substituted cyclic imide protected amino acids. The use of the dirhodium catalysts in reactions that proceed via a rhodium carbene or nitrene intermediate is also described.
摘要:
Composites of mixed metal oxides for an exhaust gas purifying catalyst comprise the following co-precipitated materials by weight of the composite: zirconia in an amount in the range of 55-99%; titania in an amount in the range of 1 -25%; a promoter and/or a stabilizer in an amount in the range of 0-20%. These composites are effective as supports for platinum group metals (PGMs), in particular rhodium.
摘要:
A process is described for converting hydroxymethylfurfural to furanic products inclusive of 2,5-furandicarboxylic acid, comprising combining a quantity of hydroxymethylfurfural with water to provide an aqueous solution containing at least about five percent by weight of hydroxymethylfurfural, and combining the aqueous solution with an oxygen source in the presence of a heterogeneous ruthenium-based catalyst and under conditions which are effective for oxidizing hydroxymethylfurfural to furanic oxidation products inclusive of 2,5-furandicarboxylic acid, but in the substantial absence of any solvent for either hydroxymethylfurfural or 2,5-furandicarboxylic acid other than water.
摘要:
A process of making a catalyst and the catalyst composition made by that process comprising a multinuclear metal compound of the formula M a (PCy 3 ) b (H) c (CO) d (OR) e (H 2 O) f with molar ratios a:b:c:d:e:f, wherein a is in the range from 2 to 2000, b is in the range from 0 to 4000, c is in the range from 0 to 6000 and d is in the range from 0 to 2000, e is in the range from 1 to 2000, and f is in the range from 0 to 100; wherein PCy 3 indicates tricyclohexylphosphine, H indicates hydride, R is an alkyl group determined by the alcohol utilized and H 2 O is water from the reaction; and a is at least twice w. A method of making one or more 2,5-dimethylhexenes is described. A method of making p-xylene using one or more 2,5-dimethylhexenes is also described.
摘要:
Изобретение относится к области гомогенного катализа и касается производства катализаторов метатезисной полимеризации дициклопентадиена. Катализатор полимеризации дициклопентадиена в форме рутениевого комплекса представляет собой [1,3-бис-(2,4,6-триметилфенил)-2- имидазолидинилиден]дихлоро(2-((2-диметиламиноэтилметиламино)метил))бензилиден)рутений формулы (I). Катализатор получают взаимодействием трифенилфосфинового комплекса рутения с 1,1-дифенил-2-пропин-1-олом в тетрагидрофуране или диоксане при температуре кипения растворителя в инертной атмосфере, а затем с трициклогексилфосфином при комнатной температуре в инертной атмосфере выделяют образовавшийся инденилиденовый комплекс рутения. Последний последовательно подвергают взаимодействию с 1,3-бис-(2,4,6- триметилфенил)-2-трихлорометилимидазолидином и 2-винилбензиламином, выделяют и сушат образовавшийся продукт. Изобретение обеспечивает высокую активность, снижение расхода катализатора, возможность управлять временем начала полимеризации, высокую чистоту катализатора.
摘要:
The present invention mainly pertains to catalytic processes for the direct amination of 2, -bis(hydroxymethyl) tetrahydrofuran to obtain compounds containing the 8-oxa-3-azabicyclo (3.2.1) octane ring, in the presence of: a homogenous catalyst which is a complex comprising at least one element selected from the group consisting of Iridium or Ruthenium and at least one donor ligand, or a heterogeneous catalyst comprising at least one Group 8-11 transition metal element and one poor metal element in the p-block of the period table.