82 results about "Oxidation state" patented technology

The application provides a method for synthesizing adiponitrile by selective ammoxidation of epoxycyclohexane. The purpose of the application is to simulate and optimize the process of synthesizing adiponitrile by one-step direct ammoxidation of epoxycyclohexane, and to develop a new type of multiphase composite metal vanadium-based oxide catalyst, which is composed of Co a V b P c Mo d MNOx / TiO2, the active elements of which include vanadium element V, cobalt element Co, phosphorus element P and molybdenum element Mo, M is an auxiliary metal element (Mn, Cr, Fe or Ni), N is an alkali metal (Na, K or Cs); the value range of a is 0.2-1.2; the value range of b is 0.8-1.5; the value range of c is 0.1-0.23; the value range of d is 0.07-0.35; x is the proportion of oxygen atoms required to meet the oxidation state of metal. The catalyst has the advantages of simple preparation, good cycle stability, high yield and the like. The yield and product purity of adiponitrile are improved, the energy consumption in the production process of adiponitrile is reduced, and a breakthrough is realized in the production technology of adiponitrile.

The application relates to a catalyst for catalytically synthesizing propylene acid from propane and application thereof, and the catalyst is represented by the following general formula: Mo a V b Te c Nb d Ni e O x Wherein, a, b, c, d and e respectively represent the atom numbers of Mo, V, Te, Nb and Ni, and the molar ratio of a:b:c:d:e is 7.0-9.0:1.7-2.5:1.0-1.5:1.7-2.3:0.1-1.0, and the value of x is determined by the oxidation state of each element; Ni is introduced by nickel molybdate, Mo is introduced by a molybdate and the nickel molybdate, and the nickel molybdate is prepared by co-precipitation of a molybdate and a nickel salt in the presence of an organic acid. According to the application, the content of different valence metals on the surface of the catalyst can be adjusted by introducing nickel into the catalyst through nickel molybdate, so that the content of high-valence elements Mo 6+ , V 5+ and Ni 2+ in the catalyst and the oxygen vacancy are increased, and the redox capacity of the catalyst is enhanced.

This invention relates to the field of encryption and anti-counterfeiting technology, specifically to a method for preparing and using an organic Sn(IV)-based metal halide reversible light-emitting conversion triple anti-counterfeiting material, comprising introducing organic ligands into a Sn(IV)X4 lattice and doping with ns 2 This invention uses Sn(IV) with a high oxidation state to replace Pb(II) in order to obtain anti-counterfeiting materials. 4+ The outer electron configuration is 4d 10 5s 0 The absence of unstable 5s orbitals gives Sn(IV)-based metal halides their typically excellent environmental and thermal stability, providing the compounds with a rigid crystal structure and stereochemical inertness. Furthermore, through ns... 2 Type Sb metal ions 3+ Doping strategies are employed to enhance the luminescence efficiency of low-dimensional organotin (IV)-based metal halides. This invention utilizes Sb... 3+ Ion doping methods are used to modulate the optical properties of compounds. Sb 3+ Ions belong to ns 2 Type metal ions and Sn 4+ With similar ionic radii and unique photophysical properties, it solves the problem of low luminous efficiency in existing luminescent materials.

A particulate cathode active material comprising (A) a base material according to the general formula Li1 + xTM1-xO2, where TM is a combination of Ni with at least one of Mn, Co and Al, and optionally at least another metal selected from the group consisting of Mg, Ti, Zr, Nb, Ta and W, and x is in the range of 0 to 0.2, and (B) crystallites of one or more cobalt compounds, where at least some of the cobalt is in the oxidation state of + III, where the base material (A) is a polycrystalline material, where x is greater than 0 and less than 1. The secondary particles of which consist of primary particles, and crystallites (B) of a cobalt compound are coated on the outer surfaces of these secondary particles, and one or more cobalt compounds are enriched at the surfaces of the primary particles in the voids between adjacent primary particles, and wherein 90% to 99.5% of the secondary particles exhibit such cobalt compound enrichment, all the detection results are determined through EDX and SEM / TEM imaging.

The invention discloses an automatic activator selection device and method based on the surface oxidation state of pyrite, and the method comprises the steps: carrying out the online detection of the spectrums of Fe, S and O elements on the surface of pyrite in ore pulp through laser-induced breakdown spectroscopy, constructing comprehensive oxidation criterion parameters according to the spectrums, and judging the oxidation grade of the parameters; then making a decision in real time and precisely adding a matched copper ion or lead ion activating agent; quantitative recognition of the mineral surface state and automatic control of activating agent adding are combined, so that objectification and precision of activating agent selection are achieved, agent waste caused by erroneous judgment of artificial experience is effectively avoided, the quick response capacity to ore property fluctuation is greatly improved, and the method is suitable for industrial production. Therefore, the flotation index of the pyrite is stabilized and optimized.

The invention belongs to the technical field of water electrolysis hydrogen production catalysts, and relates to a metal monatomic hydrogen evolution catalyst and a preparation method thereof.The catalyst comprises a large number of metal monatomic and a small number of metal clusters, metal is in an oxidation state in the catalyst, and crystalline PMA exists in the catalyst; c60 and PMA structures coexist in the catalyst; the preparation method comprises the following steps: respectively dissolving an acetylacetone metal complex, phosphomolybdic acid and fullerene in a toluene solution of a 4A type molecular sieve, respectively and sequentially mixing, magnetically stirring, washing and centrifuging to obtain the metal monatomic hydrogen evolution catalyst; the metal monatomic hydrogen evolution catalyst disclosed by the invention has excellent HER performance, a PMA-M-C60 catalyst with high loading capacity and high dispersion of metal monatomic bridging C60 and PMA is realized through a room-temperature synthesis strategy, and the catalysis cost is lower.

The invention discloses a cobalt-doped ruthenium dioxide nanoparticle material as well as a preparation method and application thereof, and relates to a ruthenium dioxide nanoparticle material as well as a preparation method and application thereof. The nano-particle cluster is formed by irregularly distributing nano-particles; the nanoparticles have a single-phase crystal structure, and the spacing distribution of {110} crystal faces is 0.315 nm; the material is composed of three elements of Co, Ru and O, wherein Co is doped into RuO2 to form Co < 0.3 > Ru0. 7O2 nanoparticles; the material is of an octahedral structure, and Ru sites are replaced by Co doping; the chemical valence state of Ru on the surface of the material is a mixed valence state of + 3 and + 4; charge transfer occurs among three ions of Co, Ru and O, so that Ru is in a lower oxidation state. The cobalt-doped ruthenium dioxide nanoparticle material is used for electrolyzing water to produce hydrogen, and shows 2500-hour long-term stability under the current density of 10 mAcm <-2 >.

The present invention (A) General formula Li 1+x TM 1-x A core material made of O2, wherein TM is a combination of Ni, Al, at least one of Mn and Co, and at least one metal optionally selected from Mg, Zr, Ti, Nb, Ta and W, x is in the range of 0 to 0.2, and at least 80 mol% of TM is nickel. (B) A coating containing at least one boron compound in the oxidized state of (B)+III, Regarding cathode active materials containing, Here, the core material (A) is a polycrystalline material composed of primary particles as secondary particles, and the lattice constant ratio c / a determined by X-ray diffraction and Rietveld refinement is 4.9420 or less. 0.0009 ≤ λ ≤ 0.0024, where λ is the molar ratio of sulfate to TM determined by inductively coupled plasma spectroscopy (ICP), and the sulfate concentration is essentially constant across the secondary particle size.

The invention provides a rapid and high-precision determination method for reduction-state Os isotope. The method comprises the following steps: selecting a sample to be detected and carrying out ultrafine crushing; weighing the ground to-be-detected sample, and sealing and dissolving the sample; taking out the dissolved to-be-detected sample, and adding isometric hydrobromic acid to convert oxidation state Os into reduction state Os; carrying out acid removal and constant volume on the reduced-state Os solution; establishing a cup structure for static determination of the Os isotope, and performing MC-ICP-MS determination of the reduction state Os isotope according to the cup structure. According to the present invention, the dissolved to-be-tested sample is creatively taken out, and the isometric hydrobromic acid is added so as to convert the oxidation state Os into the reduction state Os, such that the memory effect can be substantially reduced, the efficiency can be improved, the research cost and the research time can be reduced when the MC-ICP-MS is adopted to rapidly and precisely measure the Os isotope, and the method is suitable for the mass sample test.

A compound having a formula M(LA)x(LB)y(LC)z, where ligand LA isligand LB isand ligand LC isis disclosed. In formula M(LA)x(LB)y(LC)z, M is a metal having an atomic number greater than 40; x is 1 or 2; y and z are independently 0, 1, or 2; x+y+z is the oxidation state of the metal M; A1-A8 are carbon or nitrogen; ring B is bonded to ring A through a C—C bond; M is bonded to ring A through a M-C bond; X is O, S, Se, CRR′, or NR1; rings C and D are each independently a 5 or 6-membered carbocyclic or heterocyclic ring; at least one R4 is a five-membered or six-membered heterocyclic ring which can be further substituted by RE; each R substituent is independently selected from the several substituents; and any adjacent R substitutents are optionally joined to form a ring.

The invention belongs to the technical field of two-dimensional nano materials, and relates to an MXene material as well as a preparation method and application thereof. The invention provides a novel and efficient MXene material preparation method which is characterized in that a precursor MAX phase material, a chalcogenide element simple substance and an iodine simple substance are mixed and then subjected to a high-temperature reaction in a vacuum environment. According to the method, a chalcogenide and iodine are ingeniously utilized to generate iodide (such as SeI2 or TeI2) with strong oxidizing property in situ at a high temperature, the chalcogenide in a high oxidation state can selectively oxidize A-site atoms (such as Al) in an MAX phase, the A-site atoms are converted into volatile iodide (such as AlI3) and escape from a system, and therefore selective stripping of an A layer is achieved; and a two-dimensional Mn + 1Xn skeleton is formed. Meanwhile, the reduced chalcogenide is directly bonded to the surface of MXene as a terminal group, and the functionalized MXene material with the chalcogenide terminal group (-S,-Se or-Te) is synthesized in one step.

The mineralogical, chemical, magnetic, and physical properties of a rock can be used to determine the amount of hydrogen that was generated during rock alteration and the remaining amount of hydrogen generation potential. The methodologies evaluate the hydrogen generation potential of geological samples and identify natural hydrogen source rocks. The mineralogy, elemental composition, iron content and oxidation state, and other properties of a geological sample may be determined. From the determined mineralogy and other properties of the geological sample, the amount of hydrogen which the geological sample may have generated may be quantified. This method can determine the maturity of hydrogen source rocks, the potential volume of hydrogen that can be generated in other parts of a given geologic province with higher degrees of hydrogen source rock maturity, and quantify the potential remaining volume of hydrogen that can be still be generated via secondary enhanced hydrogen stimulation processes.

Catalyst systems comprising a procatalyst having a structure according to Formula (I) where M is a metal selected from titanium, zirconium, and hafnium, the metal having a formal oxidation state of +2, +3, or +4; each X is a monodentate or bidentate ligand; n is 1 or 2; Q is a monoanionic spectator ligand that is different from each X; RY is (C1−C30)hydrocarbyl (C1−C30)heterohydrocarbyl, (C6−C30)aryl, or (C3−‍C30)heteroaryl; R1 is (C1−‍C50)hydrocarbyl, (C1−C50)heterohydrocarbyl, (C6−‍C30)aryl, or (C3−‍C30)heteroaryl; each of R2 and R3 is independently selected from the group consisting of (C1−C30)hydrocarbyl, (C1−C30)heterohydrocarbyl, (C6−‍C30)aryl, (C3−C30)heteroaryl, −ORC, −Si(RC)3, −Ge(RC)3, halogen, and –H, wherein R2 and R3 are optionally covalently linked to form an aromatic or non-aromatic ring; and each RC is independently selected from the group consisting of (C1−C30)hydrocarbyl, (C1−C30)heterohydrocarbyl, (C6−‍C30)aryl, (C3−‍C30)heteroaryl, and −H.

(A) General formula Li 1+x TM 1-x a core material based on O2, wherein TM is a combination of Ni and at least two of Mn, Co and Al, and optionally at least one further metal selected from Mg, Ti, Zr, Nb, Ta and W, where x is in the range of -0.05 to +0.05, and the nickel content is in the range of 80 to 99 mol% of TM; (B) particles of cobalt compound(s) in which at least some of the cobalt is in the +III oxidation state; (C) a shell containing at least one oxide of B or W 1. A cathode active material comprising: The core material (A) is a polycrystalline material in which secondary particles are composed of primary particles, and particles (B) of a cobalt compound are concentrated on the surfaces of the secondary particles.

The present invention relates in particular to an adhesive composition comprising i) microfibrillated cellulose and ii) at least one metal in oxidation state II or higher. The invention further relates to the use of such an adhesive composition and to products produced using such an adhesive composition. Furthermore, the invention relates to a method for producing corrugated paperboard or cardboard or solid paperboard or cardboard by using such an adhesive composition.

The invention belongs to the technical field of preparation of catalytic materials, and provides a high-density defective polyacid-based metal organic framework catalyst for hydroboration, a preparation method and application. According to the catalyst, a metal organic framework with defects is constructed by adopting a mixed ligand strategy, a polyacid cluster is introduced in situ on the basis of the metal organic framework, and through weak interaction between a cluster object and a subject framework, regulation and control of an oxidation state of a metal node and regulation and control of a supporting effect of an expanded pore space are realized at the same time; therefore, the problem of unstable structure caused by high defect content is overcome, the polyacid-based metal organic framework catalyst with high-density defects is successfully constructed, the catalyst solves the problems that the existing hydroboration reaction is high in temperature, the catalyst is difficult to recycle and the like, efficient conversion of the alkyne hydroboration reaction can be realized, and the yield of the alkyne hydroboration reaction is increased. Moreover, the structure is still stable after repeated cyclic utilization and use, and can be expanded to various alkyne substrates.

The invention discloses a method for calculating valence states of metal atoms in a metal organic framework material, which comprises the following steps of: firstly, acquiring. Cif files of original metal organic frameworks (MOFs) from a CSD database, carrying out bonding on the. Cif files by using an open-source xyz2mol program, outputting corresponding bonding information, and then deleting the metal atoms of the MOFs structure; calculating the RSD value of the non-metal framework according to the bonding information of all non-metal atoms, and calculating the total charge of the non-metal framework according to the relation between the RSD and the TSD of the elements; reversely deducing the oxidation state of the metal atoms by using the fact that the complete MOFs present charge balance; and finally, comparing the metal oxidation state numerical value with a numerical value provided by a CSD database, and evaluating the accuracy and feasibility of the method. According to the method, the metal center oxidation state value in the MOFs can be efficiently calculated, so that whether the MOFs meet the requirement of skeleton neutrality or not is judged.

The mineralogical, chemical, magnetic, and physical properties of a rock can be used to determine the amount of hydrogen that was generated during rock alteration and the remaining amount of hydrogen generation potential. The methodologies evaluate the hydrogen generation potential of geological samples and identify natural hydrogen source rocks. The mineralogy, elemental composition, iron content and oxidation state, and other properties of a geological sample may be determined. From the determined mineralogy and other properties of the geological sample, the amount of hydrogen which the geological sample may have generated may be quantified. This method can determine the maturity of hydrogen source rocks, the potential volume of hydrogen that can be generated in other parts of a given geologic province with higher degrees of hydrogen source rock maturity, and quantify the potential remaining volume of hydrogen that can be still be generated via secondary enhanced hydrogen stimulation processes.

The invention belongs to the technical field of electro-catalytic materials, and discloses a cerium-doped core-shell series catalyst, a preparation method and an application in preparation of ethylene by electro-catalytic reduction of carbon dioxide, the catalyst is an Ag coated Cu2O catalyst taking Ag as a core and cerium-doped Cu2O as a shell layer; wherein the mole percentage of Ce is greater than 0% to 10%, and the mole percentage of Ce is calculated based on the total mole number of Cu and Ce. The rare earth element cerium (Ce) is creatively introduced as a doping agent. Ce is famous for unique Ce < 3 + > / Ce < 4 + > redox pairs and excellent oxygen vacancy regulation and control capability, and is often used as an electronic auxiliary agent or a structure stabilizer in the field of catalysis. If Ce can be introduced into the Ag-coated Cu2O core-shell structure, the oxidation state of Cu is dynamically stabilized in the reaction process by utilizing the electron interaction between Ce and Cu, so that the catalytic active center is protected, and the stability and ethylene selectivity of the catalyst are improved.

The application discloses a supported catalyst for low-temperature carbon dioxide hydrogenation and a preparation method and application thereof. The supported catalyst comprises a carrier and a metal Zr active component supported on the surface of the carrier; the Zr element is in a state of an element and / or an oxidation state, and the valence state ranges from 0 to +4; the high-dispersed metal zirconium nanoparticles are prepared by using a rotating sputtering method; compared with a traditional reduction method, the ZrO x The regulation range of x is larger; starting from the metal state zirconium, the oxidation treatment is gradually performed, so that the valence state of the zirconium can be controlled to change in a range from zero to four valences, and various unsaturated zirconium oxide catalyst materials with different valences can be obtained; the carbon dioxide is activated in a low-temperature range and catalyzes the hydrogenation reaction, and the carbon dioxide conversion rate and the methanol yield are higher than those of other metal catalysts.

This invention discloses a catalyst for the production of ethylene and propylene, its preparation method, and its applications. The catalyst comprises the following components: I) 1%–10% of chemical formula A x B y D z A compound of O4; in the chemical formula, the oxidation states of elements A, B, and D are m, n, and p, respectively, satisfying x·m + y·n + z·p = 8, where m, n, and p are integers not greater than 3; the A x B y D z O4 has a spinel structure; II) 0.5%–10% is selected from at least one oxide of rare earth elements, P, Mo, and W; III) 20.0%–55.0% is selected from at least one zeolite of ZSM-5 and ZSM-11; IV) 10%–30% is a binder; V) 25.0%–60.0% is clay. This catalyst is used in the catalytic cracking of petroleum hydrocarbons to produce ethylene and propylene, and features good catalyst stability, low methane yield, and high ethylene and propylene yields.

The present invention relates to a method for obtaining a bath of molten chloride salts comprising at least one actinide in which the oxidation state and / or degree of oxidation of said at least one actinide are predetermined according to the intended application, comprising the following steps: (a) establishing, for said at least one actinide, its potential-oxoacidity diagram at a given temperature T in a bath of molten chloride salts, (b) from the potential-oxoacidity diagram established in step (a), defining the potential-oxoacidity domain in which said at least one actinide is in the predetermined oxidation state and / or degree of oxidation, (c) selecting at least three different compounds which are different from said at least one actinide setting, at the temperature T, the potential and oxoacidity of the bath of molten chloride salts in the domain defined in step (b), it being possible for one of said at least three compounds to be the chloride ion contained in the bath of molten chloride salts, then (d) introducing, into a bath of molten chloride salts comprising said at least one actinide at the temperature T, said at least three compounds selected in step (c). The present invention relates to the use of various mixtures or compositions in the preparation of a nuclear fuel, during its operation or else during its reprocessing.

The invention discloses a nickel-molybdenum-silicon compound catalyst as well as a preparation method and application thereof. The nickel-molybdenum-silicon compound catalyst comprises the following components: (1) metal nickel and nickel oxide; (2) an oxide of molybdenum; (3) silicon oxide; wherein the molar ratio of Ni0 to Ni < 2 + > in the metallic state Ni and the oxidation state NiO in the component (1) is 0.03-0.40; the valence states of Mo in the molybdenum oxide in the component (2) comprise Mo < 5 + > and Mo < 6 + >, and the molar ratio of Mo < 5 + > to Mo < 6 + > is 0.2-1.2. When the catalyst provided by the invention is used for a reaction for preparing 2, 5-dimethylfuran by hydrogenolysis of 5-hydroxymethylfurfural in biomass deoxidation and hydrogenation, the catalyst has the characteristics of high catalytic activity and high product selectivity.

Catalyst systems comprising a procatalyst having a structure according to Formula (I): (Formula (I)) where M is a metal chosen from titanium, zirconium, or hafnium, the metal having a formal oxidation state of +3 or +4; each X is a monodentate or bidentate ligand; n is 1 or 2; Q is a monoanionic spectator ligand, wherein Q is different from each X; R1 is a (C­1−C50)hydrocarbyl, (C­1−C50)heterohydrocarbyl, (C6−C30)aryl, or (C3−C30)heteroaryl; each R2 and R3 is independently selected from the group consisting of (C1−C30)hydrocarbyl, (C1−C30)heterohydrocarbyl, (C6−C30)aryl, (C3−C30)heteroaryl, −ORC, −Si(RC)3, −Ge(RC)3, halogen, and –H, wherein R2 and R3 are optionally covalently linked to form an aromatic ring or a non-aromatic ring; and each RC is independently selected from the group consisting of (C1−C30)hydrocarbyl, (C1−C30)heterohydrocarbyl, (C6−C30)aryl, (C3−C30)heteroaryl, and –H.

The present invention relates to an aliovalently substituted argyrodite-type solid electrolyte having a composition according to formula (I): Li11-a1-b1Y1O5-a1X1 1+a1, wherein -1.0 ≤ a1 ≤ 1.0, wherein b1 is the oxidation state of Y1, wherein b1 is +2, +3, +4, +5 or +6, wherein Y is at least one element selected from the group consisting of Be, As, Bi, Sb, Ag, Ho, Lu, Pb, Hf, Se, Cr, Zr, Ti, Te, Cr, V, Mo, Nb, Re and Ru, wherein X1 is F, Cl, Br, I or combinations thereof.

A method for separating thorium and cerium from a solid concentrate comprising compounds of thorium, cerium and further rare earth metals, comprising:a) contacting the solid concentrate with an acid to achieve an acid composition with a pH of less than 0.5;b) reacting the acid composition obtained in step a) with ozone or heating the acid composition at a temperature ranging from 110° C. to 130° C. for a time period ranging from 1 to 3 hours, thereby oxidizing the cerium ions in the acid composition to an oxidation state of +IV;c) increasing, to at most 2, the pH of the composition obtained in step b), resulting in the precipitation of thorium and cerium compounds; andd) separating the precipitated thorium and cerium compounds from the composition obtained in step c) to obtain an aqueous acidic rare earth solution depleted in thorium and cerium.

The application provides a method for simulating a high-pressure dry oxygen thermal oxidation process of monocrystalline silicon, and relates to the technical field of silicon process simulation, and comprises the following steps: step S1: a model of monocrystalline silicon is constructed, a vacuum layer is arranged on the surface of the monocrystalline silicon in the model, O2 molecules are added into the vacuum layer, and the atomic positions of the monocrystalline silicon are optimized by using a reactive force field molecular dynamics method under a state higher than atmospheric pressure; step S2: after the monocrystalline silicon is heated to a reaction temperature, the temperature and pressure are kept constant, until the monocrystalline silicon and the O2 molecules fully react, the model is annealed, the atomic positions are optimized after cooling, and an oxidation sample is obtained; the oxidation sample comprises an oxidation layer, a sub-oxidation layer and a silicon substrate layer; step S3: structural characteristic parameters of the oxidation layer and the sub-oxidation layer are obtained. The application accelerates the reaction rate by increasing the O2 molecule concentration through high pressure, and obtains the structural characteristic parameters of the oxidation layer and the sub-oxidation layer, which is beneficial to the study of the sub-oxidation state and stress distribution at the interface between the oxidation layer and the sub-oxidation layer.

Catalyst systems comprising a procatalyst having a structure according to Formula (I): [insert formula] where M is a metal chosen from titanium, zirconium, or hafnium, the metal having a formal oxidation state of +3 or +4; each X is a monodentate or bidentate ligand; n is 1 or 2; each of R8−R12 is independently selected from (C­1–C30)hydrocarbyl, (C1−C30)heterohydrocarbyl, (C6-C30)aryl, (C3-C30)heteroaryl,-Si(RC)3, −Ge(RC)3, and –H, wherein optionally, any of R8−R12 are covalently connected to form one or more ring or multi-ring structures; R1 is a (C­1−C50)hydrocarbyl, (C1−C50)heterohydrocarbyl, (C6-C30)aryl, or (C3-C30)heteroaryl; each R2 and R3 is independently selected from the group consisting of (C1−C30)hydrocarbyl, (C1−C30)heterohydrocarbyl, (C6-C30)aryl, (C3-C30)heteroaryl, −ORC, −Si(RC)3, −Ge(RC)3, halogen, and –H, wherein R2 and R3 are optionally covalently linked to form an aromatic ring or a non-aromatic ring; and each RC is independently selected from the group consisting of (C1−C30)hydrocarbyl, (C1−C30)heterohydrocarbyl, (C6-C30)aryl, (C3-C30)heteroaryl, and –H.

The invention relates to a preparation method of an iron oxide-loaded noble metal catalyst and application of the iron oxide-loaded noble metal catalyst in a reaction of catalyzing hydrogenation of o-chloronitrobenzene to synthesize o-chloroaniline. Wherein the iron oxide is a carrier, the precious metal Pt or Ru is an active component, the mass fraction is 0.5%-4%, and the particle size of the precious metal is smaller than 3 nm. The interaction between the noble metal nanoparticles and the iron oxide carrier is enhanced by adopting a hydrothermal method, so that the dispersion of active components is facilitated. When the catalyst is used for catalyzing hydrogenation of o-chloronitrobenzene to synthesize o-chloroaniline, a dechlorination inhibitor does not need to be additionally added, the catalytic hydrogenation reaction can be carried out at normal pressure, and the activity is high; the oxidation valence state of iron can be controlled by regulating and controlling hydrothermal conditions, so that the surface electron state of noble metal is further influenced, dechlorination in the reaction process is effectively inhibited, and the product selectivity is high; and the catalyst has magnetism and is easy to recycle and reuse.

This invention belongs to the field of catalyst preparation and application technology, and discloses a method for preparing sulfur-bridged bimetallic alkyne complexes and their application in the dehydrogenation coupling synthesis of 1,4-diyne. The method uses thiols or thiophenol salts as bridging ligands, with each metal center coordinated with a cyclopentadienyl group or a substituted cyclopentadienyl group. This invention achieves coordination activation of the terminal alkyne by controlling the oxidation state of the metal center and altering the bonding mode of the terminal alkyne at the metal center. In this system, the sulfur-bridged ligand not only assists the metal center in activating the terminal alkyne but also stabilizes a key intermediate in the catalytic process. Subsequently, the coordinated-activated terminal alkyne undergoes a reductive elimination process to generate 1,4-diyne. This reaction can be carried out in a temperature range of -100℃ to 25℃, with a reaction time of 0.5 to 48 hours. This method can synthesize a series of novel sulfur-bridged bimetallic alkyne complexes with high yield and high selectivity, providing a novel catalytic system for the activation of C-H bonds in terminal alkynes mediated by inexpensive metals and the further synthesis of 1,4-diyne.