摘要:
A catalyst including gold, or a compound thereof, and sulphur, a compound of sulphur, trichloroisocyanuric acid or a metal dichloroisocyanurate on a support, together with a process for manufacturing the catalyst and its use in a chemical process are described.
摘要:
A composition is capable of curing via condensation reaction. The composition uses a new condensation reaction catalyst. The new condensation reaction catalyst is used to replace conventional tin catalysts. The composition can react to form a gum, gel, rubber, or resin.
摘要:
The invention relates to a method for converting carbon dioxide or bicarbonates into formic acid derivatives, i.e. formate salts, formate esters, and formamides, using molecular hydrogen and a catalytic system comprising a cobalt complex of cobalt salt and at least one tripodal, tetradentate ligand. The catalyst complex can be used as a homogeneous catalyst. The invention further relates to the cobalt complexes per se.
摘要:
The present invention provides a novel catalyst of formula (I): wherein M is selected from Zn(H), Co(II), Mn(II), Mg(II), Fe(II), Cr(III)-X or Fe(III)-X, and the use thereof in polymerising carbon dioxide and an epoxide.
摘要:
The present application provides, among other things, compounds and methods for metathesis reactions. In some embodiments, provided compounds promote highly efficient and highly Z-selective metathesis. In some embodiments, provided compounds and methods are particularly useful for producing allyl alcohols. In some embodiments, provided compounds have the structure of formula I. In some embodiments, provided compounds comprise ruthenium, and a ligand bonded to ruthenium through a sulfur atom.
摘要:
The present invention refers to novel ruthenium- and osmium-based catalysts for olefin metathesis reactions, particularly to catalysts having stereoselective properties. Z-selectivity is obtained by utilising two mono-anionic ligands of very different steric requirement. In olefin metathesis reactions these catalysts selectively provide the Z-isomer of disubstituted olefinic products.
摘要:
A composition is capable of curing via condensation reaction. The composition uses a new condensation reaction catalyst. The new condensation reaction catalyst is used to replace conventional tin catalysts. The composition can react to form a gum, gel, rubber, or resin.
摘要:
The present invention provides a method for producing an aryloxytitanium composition that can solve the problems of the clogging of the storage tank, the piping, the pump, and the like during storage and transfer, and the like, and a decrease in catalytic activity which occurs during long-term storage, and is extremely preferred as a catalyst for the production of a diaryl carbonate. A method for producing an aryloxytitanium composition, comprising a step (1) of adding a diaryl carbonate to an organic oxytitanium composition having an R—O—Ti linkage, wherein R represents an organic group containing 1 to 20 carbon atoms, and evaporating a component having a lower boiling point than that of the diaryl carbonate, together with the diaryl carbonate, so as to obtain an aryloxytitanium composition.
摘要:
New metal persulfido compositions of matter are described. :In one embodiment the metal is molybdenum and the metal persulfido complex mimics the structure and function of the triangular active edge site fragments of MoS2, a material that is the current industry standard for petroleum hydro desulfurization, as well as a promising low-cost alternative to platinum for electrocatalytic hydrogen production. This molecular [(PY5W2)MoS2]x+ containing catalyst is capable of generating hydrogen from acidic-buffered water or even seawater at very low overpotentials at a turnover frequency rate in excess of 500 moles H2 per mole catalyst per second, with a turnover number (over a 20 hour period) of at least 19,000,000 moles H2 per mole of catalyst.
摘要翻译:描述了新的金属过硫酸盐组合物。 :在一个实施方案中,金属是钼,并且金属过硫化物络合物模拟MoS2的三角形活性边缘位点片段的结构和功能,MoS2是石油加氢脱硫的当前行业标准的材料,以及有希望的低成本替代物 用于铂催化氢生产。 这种分子[(PY5W2)MoS2] x +催化剂能够以非常低的超电势从酸性缓冲水或甚至海水中产生氢,转化频率超过每摩尔催化剂每秒500摩尔H 2,转化数( 超过20小时)每摩尔催化剂至少19,000,000摩尔H 2。
摘要:
The present invention provides polymerization catalyst compositions employing half-metallocene compounds with a heteroatom-containing ligand bound to the transition metal. Methods for making these hybrid metallocene compounds and for using such compounds in catalyst compositions for the polymerization and copolymerization of olefins are also provided.