摘要:
The present application discloses a nanoparticle composition prepared from a mixture comprising: a) a transition metal salt; b) an iron salt; and c) a reducing agent; and methods for the use of such compositions, including the reduction of an organic compound comprising a nitro group to form an organic compound comprising an amine group, the Cu-catalyzed cyclization of an azide and an alkyne (click chemistry) and cross coupling reactions, notably Suzuki-Miyaura reactions. The transition metal salts are in particular Pd, Cu and Ni salts, the content of these metals being typically in the ppm range based on the major constituent Fe in the final products.
摘要:
Methods of using a device is provided that contains a heat-shrunk thermoplastic base having a high-surface area textured metal surface, wherein the textured metal surface has an average height from about 100 nanometers to about 5 micrometers.
摘要:
Organosilicon-functional phase transfer catalysts (PTCs) and methods for transferring immiscible molecules into a silicon-functional phase employing an organosilicon-functional PTC are provided.
摘要:
The invention concerns a catalyst containing: (a) more than 70 wt. % of a polyethyleneglycol of formula (I): H-(OCH2CH2)n-OH, in which: n is a whole number between 3 and 16; and the mean molecular weight in number is less than 650; (b) rhodium in elementary or combined form; (g) between 2 and 25 wt. % of a ligand comprising at least one phosphorus atom; (h) at most, 25 wt. % of water. The invention also concerns the use of said catalyst for preparing aldehydes.
摘要:
The invention relates to ionic compounds in which the anionic load has been displaced, and the uses of these compounds. A compound disclosed by the invention comprises an anionic portion combined with at least one cationic portion M in sufficient numbers to ensure overall electronic neutrality. The anionic portion is comprised of one of the groups (A) and (B) wherein Y1, Y2, Y3, Y4, and Y5 represent a carbonyl group, a sulphonyl group, a thiocarbonyl group, a thionyl group, a -C(=NCN)- group or a -C(=C(CN)2)- group; Z represents an electroattractive radical; each of the substituents, RA, RB, RC, and RD represents independently of one another a monovalent or divalent organic radical or is part of a polymer chain, with at least one or the substituents RC and RD being a perfluorinated radical. The compounds can be used especially for ionic conducting materials, electronic conducting materials, colorants, and the catalysis of various chemical reactions.
摘要:
There is disclosed synthesis of CH3OH from carbon monoxide and hydrogen using an extremely active homogeneous catalyst for methanol synthesis directly from synthesis gas. The catalyst operates preferably between 100-150°C and preferably at 100-150 psia synthesis gas to produce methanol. Use can be made of syngas mixtures which contain considerable quantities of other gases, such as nitrogen, methane or excess hydrogen. The catalyst is composed of two components: (a) a transition metal carbonyl complex and (b) an alkoxide component. In the simplest formulation, component (a) is a complex of nickel tetracarbonyl and component (b) is methoxide (CH3O-), both being dissolved in a methanol solvent system. The presence of a co-solvent such as p-dioxane, THF, polyalcohols, ethers, hydrocarbons, and crown ethers accelerates the methanol synthesis reaction.
摘要:
A synthetic enzyme mimic comprising a support carrying at least one scaffold, the scaffold incorporating multiple functional groups comprising (i) a carboxylate group, (ii) an imidazole group; and (iii) a nucleophilic group such as an amino, hydroxy or thiol group; wherein the functional groups are arranged in close proximity. The invention also provides a process for making a synthetic enzyme, comprising the step of attaching a catalytic unit comprising said scaffold to a support such as a polymer by attachment of a reactive handle such as an azide group to the support and a matching reactive handle to the catalytic unit, in particular a terminal alkynyl group, to form a linker which is preferably an ether linker. Advantageously the attaching is done via click chemistry.
摘要:
Catalysts suitable for use in reforming hydrocarbons have a halogen promoter and a plurality of dispersed nanocatalyst particles supported on a solid support. The dispersed nanocatalyst particles are manufactured using a dispersing agent to control 5 the size and/or crystal face exposure of the particles. The controlled size and dispersion of the nanocatalyst particles allows the reforming catalyst to be loaded with significantly less halogen promoter while still maintaining or increasing the catalyst's reforming performance. The catalysts of the present invention have shown improved C5+ production with the significantly reduced levels of halogen promoter.
摘要:
L'invention concerne un procédé de préparation d'une composition à base de particules, comprenant : (i) la mise en contact d'un mélange comprenant une structure dendritique et un précurseur de composé métallique dans un fluide, dans des conditions de température et de pression telles que le mélange ne soit pas soluble dans ledit fluide ; et (ii) la transformation chimique du précurseur de composé métallique.
摘要:
La présente invention concerne un système catalytique hétérogène en phase gel comprenant : - un polymère organique, apte à former une phase gel en présence d'un solvant, - un solvant apte à conférer au système une structure phase gel, - un liquide ionique lié audit polymère par interaction covalente entre ledit polymère et au moins une des deux entités ioniques constituant ledit liquide ionique, et - au moins une espèce catalytique ou précatalytique immobilisée en tout partie dans le système catalytique hétérogène par interaction non covalente avec au moins une des entités ioniques constituant ledit liquide ionique.