32 results about "Catalytic complex" patented technology

Catalytic complexes including a metal atom having anionic ligands, at least one nucleophilic carbene ligand, and an alkylidene, vinylidene, or allenylidene ligand. The complexes are highly stable to air, moisture and thermal degradation. The complexes are designed to efficiently carry out a variety of olefin metathesis reactions.

A method for synthesizing cyclic polymers using transition metal alkylidene complexes as reaction catalysts is provided, wherein the complexes contain a cyclic group. Polymerization is carried out on the catalyst, using cyclic olefin monomers that undergo ring insertion polymerization, and no linear intermediates are generated. Following completion of polymerization, the cyclic polymer detaches from the complex via an intramolecular chain transfer reaction and the catalytic complex is regenerated. The invention also provides novel transition metal alkylidene complexes useful as catalysts in the aforementioned process, as well as novel cyclic hydrocarbons.

The present invention relates to a catalytic complex for olefin metathesis reactions, to a process for its preparation and to its use in olefin metathesis reactions, particularly in ring opening metathesis polymerisation (ROMP) reactions.

The invention relates to all compounds of the formula (I) or (II) in which: L is a neutral ligand; X, X′ are anionic ligands; R¹ and R² are, separately, a hydrogen, a C₁-C₆ alkyl, a C₁-C₆ perhalogenoalkyl, a aldehyde, a ketone, an ester, a nitrile, an aryl, a pyridinium alkyl, an optionally substituted C₅ or C₆ pyridinium alkyl, perhalogenoalkyl or cyclohexyl, a C_nh2_NY radical 10 with n between 1 and 6 and y an i8onic marker, or a radical having the formula: wherein R¹ can be a radical of formula (Ibis) when the compound has formula (I) or of formula (IIbis) when the compound has formula (II), R³ is a C₁-C₆ alkyl, or a C₅ or C₆ cycloalkyl or a C₅ or C₆ aryl; R⁰, R⁴, R⁵, R⁶, R⁷, R⁸, R⁹, R¹⁰, R¹¹, are, separately, a hydrogen, C₁-C₆ alkyl, a C₁-C₆ perhalogenoalkyl, or a C₅ or C₆ aryl; wherein R⁹, R¹⁰, R¹¹ can be a heterocycle; X¹ is anion. R¹ and R² can form, with the N and the C to which they are attached, a heterocycle.

An electrocatalyst based on a highly electroconducting polymer and a transition metal, in which transition metal atoms are covalently bonded to heteroatoms of the backbone monomers of the polymer. The covalently bonded transition metal atoms are nucleation sites for catalytically active transition metal particles. The complex is prepared by complexing a highly electroconducting polymer with transition metal coordination ions and then reducing the transition metal ions to neutral atoms. An electrode for a fuel cell is made by impregnating an electrically conducting sheet with the catalytic complex and drying the impregnated sheet. A fuel cell with a liquid anolyte uses the electrode as its cathode. The anolyte includes an aqueous solution of conjugate polybasic acids buffer, such as H3PO4-NaH2PO4-Na2HPO4, and an alcohol such as methanol as a reductant.

A complex of a transition metal complying with the general formula (I)in whichM is a transition metal of groups 6 to 12,T is the oxidation state of M,each A, which may be identical with or differ from each other, is an atom or an atomic grouping bonded covalently or ionically to the transition metal M,b is the valency of A,each R<1>, R<2>, R<3>, R<4 >and R<5 >is independently a hydrogen atom, an unsubstituted or substituted hydrocarbon group, an unsubstituted or substituted heterohydrocarbon group, or an inert functional group,R<6 >and R<7 >are, independently of one another, a polynuclear aromatic hydrocarbon group containing at least two condensed benzene nuclei, substituted with at least one hydrocarbon group.

The invention discloses a heavy metal complex wastewater treatment and recycling process based on iron-based biochar. The heavy metal complex wastewater treatment and recycling process comprises a heavy metal complex wastewater treatment process and a heavy metal recycling process. The heavy metal complex wastewater treatment process comprises the following steps: firstly, adding iron-based biochar into heavy metal complex wastewater to carry out adsorption reaction, then adding an oxidant 1 to carry out catalytic complex breaking reaction, separating residues and purified liquid after the reaction is completed, discharging the purified liquid, and feeding the residues to the heavy metal resourceful treatment process. The heavy metal resourceful treatment process comprises the following steps: leaching residues with a leaching solution to obtain activated iron-based biochar and a heavy metal-containing waste liquid, reutilizing the activated iron-based biochar, adding an oxidizing agent 2 into the heavy metal-containing waste liquid to carry out an oxidation reaction, then adjusting the pH value, separating the residues and a supernatant, and evaporating the supernatant to dryness to obtain high-purity heavy metal salt. The process solves the problems of low oxidation efficiency and difficulty in recycling after heavy metal separation in the prior art, and is easy for large-scale popularization and application.

The invention discloses a nano electro nickel-plating technology, and according to the nano electro nickel-plating technology, a nano catalytic complex additive is added into a nickel plating solution, and electroplating is performed under the reaction effect of a superconducting magnetic field effect. The nano electro nickel-plating technology uses a magnetic field generated by a superconducting effect reaction, and under the promoting effect of the nano catalytic complex additive, the metal deposition crystal nucleus size is 18-25nm, and 80% of metal deposition crystal nucleuses are strip shaped and non crystalline. The nano electro nickel-plating technology is excellent in electroplating walking ability, has deep-plating ability, and is small in nickel layer stress, and strong in extensibility. Compared with a traditional nickel plating technology, when a nickel layer with the same thickness is plated, the nickel layer plated by the nano electro nickel-plating technology has significantly improved hardness, wear resistance, light intensity, ductility and corrosion resistance, and can withstand a longer-time corrosion resistant test. In addition, the nano electro nickel-plating technology can be used for subsequent processing only by one process, traditional semi-finished nickel, totally-finished nickel, high-sulfur nickel, nickel sealing and other multiple processes are not needed, the electroplating process is saving, the production efficiency is improved, the cost is reduced, at the same time emissions are also reduced, and the nano electro nickel-plating technology is economic and environmental-friendly.

A method of utilizing a catalytic complex having a transition metal (e.g. nickel, cobalt) ion coordinated to a calixarene ligand in upgrading hydrocarbon feedstocks containing C₂₀ through C₅₀ hydrocarbons (e.g. vacuum gas oil) to produce light petroleum products (e.g. medium distillate, naphtha) is specified. A method of using the catalytic complex with a supported co-catalyst to synergistically hydrocrack the feedstocks is also provided.

The invention relates to a catalytic complex for preparing isocyanurate foam from bagasse ployol comprising the constituents (by mass ratio) of solvent 100 parts, foaming catalyst 0-20 parts, chain growth catalyst 1-15 parts and foam stabilizer 15-60 parts. The catalytic compound is suitable for the water foaming system of cane trash polyhydric alcohols, the reaction speed can be regulated well.

The invention discloses a carbon material coated spinel iron oxide in-situ growth MOFs adsorption catalytic complex, a preparation method of the carbon material coated spinel iron oxide in-situ growth MOFs adsorption catalytic complex and application of the carbon material coated spinel iron oxide in water treatment catalysis. The preparation method comprises the steps of 1) preparing a magnetic nanomaterial; 2) preparing carbon material-coated magnetic spinel iron oxide TFe2O4 from the nano spinel ferrite obtained in the step 1), the carbon material and ultrapure water according to a certain proportion; and 3) preparing a carbon material-coated magnetic carbon material in-situ growth MOFs material from the carbon material-coated magnetic TFe2O4 obtained in the step 2), an organic ligand and ultrapure water according to a certain proportion, namely the carbon material-coated spinel iron oxide TFe2O4 in-situ growth MOFs adsorption catalytic complex. The complex is simple in preparation process operation, rich in raw material source, low in manufacturing cost, high in magnetic recovery capacity, excellent in regeneration performance and capable of efficiently adsorbing and removing heavy metal and trace organic matter in water.

A catalytic complex for denitration of lean burn gasoline engine exhaust and a preparation method thereof aim to overcome unsuitability of an existing ternary composite catalyst catalytic complex for lean burn technology. The catalytic complex comprises a cellular titanium dioxide carrier and metal platinum, rare earth metal, and metal copper that are attached to the carrier. The preparation method includes steps of: immersing titanium dioxide into a copper sulfate pentahydrate solution with a concentration of 75%, and drying and roasting to obtain a copper/ titanium dioxide catalyst complex; immersing the copper/ titanium dioxide catalyst complex in a rare earth cerium solution, and then drying and roasting to obtain a cerium / copper / titanium dioxide catalyst complex; and immersing the cerium / copper / titanium dioxide catalyst into a platinum nitrate salt solution, and drying and roasting to obtain a nitrate platinum / cerium / copper / titanium dioxide catalyst complex. The invention is beneficial to nitrogen oxides and reduction thereof, and significantly reduces temperature of harmless transformation of nitrogen oxides, and improves the ability of resistance to sulfur poisoning of the catalyst. Besides, the catalytic complex reduces use amount of noble metal platinum and cost of catalyst, and conducts efficient reduction on NOx in lean burn of gasoline engine exhaust.