10 results about "Oxygen bridge" patented technology

The application discloses a preparation method, a catalytic material and application of an oxalate-based nickel-iron MOF doped carbon nanotube catalytic material. The preparation method comprises the following steps: dispersing nickel nitrate hexahydrate, potassium trioxalate ferrate and carbon nanotubes into a methanol solution, stirring at room temperature after ultrasonic treatment to obtain a mixed solution with precipitates, centrifuging the obtained mixed solution, washing with methanol, and vacuum drying to obtain the oxalate-based nickel-iron MOF doped carbon nanotube catalytic material. The oxalate-based coordination is utilized to synthesize the oxalate-based bridged Ni-Fe bimetallic coordination polymer by one-step synthesis. The oxalate-based oxygen bridge bond participates in the transmission of the synergistic effect between the Ni-Fe bimetals. After the carbon nanotubes are doped, the active sites of the catalytic material are fully exposed, and the Ni-Fe bimetals connected by the oxygen bridge can fully exert the synergistic effect between the two.

The invention discloses a catalyst for preparing isoprene rubber, a preparation method and application, and belongs to the technical field of rubber chemical industry and catalytic materials. The technical problems to be solved are that the existing catalyst is difficult to separate, high in metal residue, non-reusable, sensitive to a solvent system and impurities and difficult to completely meet the requirements of continuous, green and high-performance production. According to the key points of the technical scheme, a novel catalyst carrier is prepared from aluminum oxide and cerium dioxide, and the surface of the carrier and rare earth trifluoromethanesulfonate form a weak coordination anchoring structure through hydroxyl, oxygen bridges, oxygen vacancies and Lewis acid centers, so that the active centers can be uniformly distributed on carrier pore channels and surface sites in a stable solid form; the prepared catalyst can solve the problems that a traditional homogeneous catalyst system is inseparable, high in metal residue, incapable of being repeatedly used, sensitive to the environment and the like, and the service life of the catalyst is prolonged.

The invention relates to the technical field of electrocatalytic materials, and mainly discloses an anti-poisoning electrocatalytic ammoxidation catalyst based on a bimetallic-polyoxometallate interface and a preparation method thereof, and the catalyst is a composite material formed by in-situ growth on a pretreated nickel foam substrate through a hydrothermal method. In the bi-metal-POM structure constructed by the invention, a phosphotungstic acid anion skeleton provides a stable oxygen bridge coordination environment, Cu and Ni active centers can be anchored on the atomic scale, and agglomeration and dissolution under high potential are prevented; heterogeneous bimetal sites formed by Cu and Ni in a POM framework can realize electronic coupling regulation and control through an oxygen bridge, and through bimetal-POM interface electronic regulation and control, the method does not need an additional reducing agent or template agent, is simple in process and high in controllability, and can be expanded to a metal-PTA system of Co, Fe and the like by replacing precursor metal salt, so that the method is suitable for industrial production. The obtained catalyst can keep a uniform structure and stable electro-catalytic performance.

The invention relates to the technical field of composite materials, in particular to a vanadium-magnesium bimetal loaded MOF-based composite material as well as a preparation method and application thereof. According to the preparation method, the V-Mg-MOF / CNF composite material is prepared by combining the MOF loaded with vanadium and magnesium bimetals with the carbon nanofibers and is used for solid hydrogen storage, V in the V-Mg-MOF serves as a catalytic center, dissociation and recombination of hydrogen molecules can be efficiently catalyzed by the V due to the multiple valence states and d electron characteristics of the V, and energy barriers in the hydrogenation / dehydrogenation process are reduced; mg is used as a hydrogen storage main body, the mass is light, the hydrogen storage capacity is high, when Mg < 2 + > is connected with V < 3 + > through an oxygen bridge, the electron pushing effect of Mg < 2 + > can slightly improve the electron cloud density of the surrounding area of V < 3 + >, the polarization capability of V < 3 + > on hydrogen molecules can be changed, and therefore the catalytic activity is enhanced. The MOF-based composite material loaded with the vanadium and magnesium bimetals has good hydrogen adsorption capacity and excellent hydrogen storage stability and regeneration performance.

This application belongs to the field of environmental functional materials and air pollution technology, specifically relating to a composite photocatalyst, its preparation method, and its application. The composite photocatalyst includes Cd. x Zn 1‑x S and aluminum-doped strontium titanate, the Cd x Zn 1‑x S is grown in situ on the surface of aluminum-doped strontium titanate in the form of nanospheres, where x takes the value of 0.1-0.9. The beneficial effects of this application include: the composite photocatalyst described in this application, through the construction of Cd... x Zn 1‑x The tight heterostructure between S and Al-SrTiO3 forms oxygen bridges such as Cd-O-Sr and Zn-O-Ti, achieving strong chemical bonding and band matching at the interface. This structure effectively suppresses the recombination of photogenerated electron-hole pairs (significantly reducing the PL spectral signal), enhances the photocurrent response (stronger transient photocurrent), and reduces the interfacial resistance (smallest EIS arc radius), thereby significantly improving quantum efficiency. This is beneficial for the adsorption and activation of NH3 molecules and can effectively control the reaction pathway, inhibiting NO. x The generation of harmful byproducts increases the selectivity of the reaction.

The invention belongs to the technical field of electrochemical sensing and nano materials, and particularly relates to a preparation method of an oxygen-bridged platinum-based diatomic catalyst and application of the oxygen-bridged platinum-based diatomic catalyst in detection of dopamine and hydrogen peroxide. A coordination-pyrolysis method is adopted, firstly, 2-hydroxy-5-methyl isophthalaldehyde, chloroplatinic acid and the like are used as raw materials to synthesize a precursor, then the precursor is subjected to pyrolysis treatment and then loaded on conductive carbon black, and finally the oxygen-bridged platinum-based diatomic catalyst (Pt2-N4O2 / CB) is prepared. When the catalyst is applied to an electrochemical working electrode, high-sensitivity and high-selectivity in-situ real-time detection on biomolecules such as dopamine (DA) and hydrogen peroxide (H2O2) can be realized, and meanwhile, the catalyst has excellent anti-interference capability and long-term stability, can be adapted to various electrode types, has good technical transformation potential, and can be widely applied to electrochemical working electrodes. The method has a wide application prospect in the fields of neuroscience research and biomedical diagnosis.

The application belongs to the technical field of pharmaceutical chemistry and pharmacology, and relates to application of a forskolin oxygen bridge ring derivative in preparation of anti-inflammatory drugs. The forskolin oxygen bridge ring derivative has a chemical structural formula shown in formula (I), is obtained by reacting forskolin and potassium hydroxide in methanol to obtain forskolin rearrangement product 1, and then reacting the forskolin rearrangement product 1 with aryl iodide in anhydrous dichloroethane under the catalysis of anhydrous silver acetate, anhydrous copper acetate and palladium acetate to obtain the forskolin oxygen bridge ring derivative (I). The forskolin oxygen bridge ring derivative obtained by the application has relatively strong anti-inflammatory activity, and the activity is equivalent to that of dexamethasone, and can be used for preparing anti-inflammatory drugs.

The invention discloses a catalyst for efficient urea oxidation reaction as well as a preparation method and application thereof, belongs to the technical field of inorganic material catalysts, and synthesizes a catalyst formed by self-assembly of a plurality of ultrathin nanosheets for urea-assisted water electrolysis. A dissimilar metal oxygen bridge structure in an oxidation state is accurately adjusted through a magnetic-electric field, adsorption and activation of OH <-> are remarkably enhanced through the reconstructed Fe-doped NiOOH surface, and generation of Fe-* OH is promoted, so that the degradation efficiency of urea is greatly improved, the overpotential is as low as 1.54 V (100.0 mA. Cm <-2 >), and the Faraday efficiency, the conversion rate and the selectivity are close to 100%; meanwhile, it is proved that the Fe-* OH intermediate not only effectively catalyzes conversion of urea, but also effectively catalyzes conversion of various organic compounds such as HMF, hydrazine hydrate and methanol. Therefore, the catalytic system has excellent adaptability and huge potential in the aspect of converting various organic compounds.

The invention discloses a method for editing and regulating aromaticity and surface reaction activity of a nickel (II) norcorrole derivative through an oxygen bridging skeleton, a product of the method and application of the product, and belongs to the technical field of surface molecular science and molecular nanotechnology. In a solution phase pre-synthesis stage, a predetermined number of oxygen atoms are introduced into a pyrrole-pyrrole connecting bond of a nickel (II) norcorrole molecule, a determined number of C-O-C bridging structures are constructed and formed, and a precursor molecule with a programmable structure is obtained. The precursor is deposited on the surface of a metal single crystal and is subjected to a surface-assisted dehydrocyclization reaction after thermal annealing treatment, and oxygen atoms are retained and integrated into a final macrocyclic skeleton. The introduction of the oxygen bridge systematically regulates and controls the electronic structure and aromaticity distribution of the product, and further reconstructs the front line orbit space distribution. In the surface covalent coupling reaction, products not doped with oxygen are subjected to multi-path coupling to form products with different structures, and oxygen bridging products selectively form a single beta-beta site coupling structure.