5 results about "Coordination polymerization" patented technology

This invention discloses a Pb(II) coordination polymer catalytic electrode, its preparation method, and its application, belonging to the field of flow battery electrode materials and electrochemical energy storage technology. The catalytic electrode uses an acid-washed carbon felt electrode as a substrate, and nanoscale Pb-based polymers are grown in situ on the surface of the carbon felt substrate via ultrasonic chemical deposition. 2+ A polymer catalyst layer formed by coordination polymerization with nitrogen-containing organic ligands. The preparation method involves acid washing pretreatment of the original carbon felt electrode, mixing lead source solution and iodine source solution under ultrasonic conditions to obtain a lead-containing intermediate reaction system, then placing the acid-washed carbon felt electrode in the lead-containing intermediate reaction system, adding a nitrogen-containing organic ligand solution, and then in-situ polymerizing the Pb(II) metal-organic coordination polymer on the carbon felt fiber surface under ultrasonic conditions. This catalyst electrode can improve the effective active area and mass transfer accessibility of the electrode, maintain good structural stability under acidic conditions, and enhance the coulombic efficiency and long-term cycling stability of iron-chromium redox flow batteries.

The invention discloses a method for obtaining different polar monomer copolymers and homopolymers through a catalyst composition, and particularly provides a catalyst composition composed of alkyl aluminum, organic boron salt and a catalyst. The composition can catalyze a block copolymerization reaction between a polymer with a repetitive unit as shown in a formula IV and a compound M to obtain a block copolymer III, the compound M can also be catalyzed to be subjected to polymerization reaction to obtain a polymer I with a repetitive unit as shown in the formula A. According to the method, coordination polymerization of polar monomers can be efficiently catalyzed, the used catalyst is high in stability, and the homopolymer and the block copolymer which are clear in structure can be obtained at high yield; the obtained polymer has a high glass transition temperature, and part of the polymer presents a dual glass transition behavior. .

The invention provides a Cu single-site coordination polymer catalyst as well as a preparation method and application thereof, and the Cu single-site coordination polymer catalyst is obtained by carrying out coordination polymerization reaction on 2-methylimidazole serving as a ligand and bivalent copper salt by adopting a hydrothermal method. The Cu single-site coordination polymer catalyst disclosed by the invention has the advantages of good catalytic activity and high acetic acid selectivity in preparation of acetic acid by electroreduction of carbon monoxide.

This invention belongs to the field of polyolefin preparation technology, and particularly relates to an olefin polymerization method and a polyolefin. The method includes: (1) coordination polymerization of olefin monomers or comonomers in the presence of a polymerization catalyst and hydrogen; (2) a deep polymerization reactor connected in series at the end of the polymerization reactor in step (1), wherein the material at the outlet of the polymerization reactor in step (1) is introduced into the deep polymerization reactor and a catalyst modifier is added therein to continue deep polymerization to produce ultra-high molecular weight components and obtain polyolefins; the length-to-diameter ratio of the deep polymerization reactor is 2-15, and it is equipped with a stirring blade assembly; the phase of each stirring blade assembly is staggered from the phase of the next stirring blade assembly along the axis; the blade width is 50-600 mm. This invention improves the performance of polyolefin products and can utilize an additional 1%-30% of the catalyst efficiency, avoiding resource waste.

The application provides a red-brown fluorescent metal-organic coordination supermolecular light conversion material, which has a chemical general formula of [Zn(Hntb)(tztp)] n , belongs to a monoclinic system, a space group is P21 / c, and a unit cell parameter is 0.8 nm*0.8 nm*1.8 nm. 2‑ In the chemical general formula, the component Hntb is obtained by removing two protons from a rigid aromatic ternary carboxylic acid H3ntb, the structure of the H3ntb is shown as formula I, and the structure of the electron-rich component tztp is shown as formula II. The light conversion material prepared by the application is a crystalline supermolecular aggregate based on [Zn(Hntb)(tztp)] n coordination polymerization chain, and two three-leaf helix structure units in mirror image relationship exist in the crystal structure. The yield of the new material can reach 53.6%, the new material has good thermal stability, under ultraviolet light, the crystal sample is red-brown, and as a single-component non-rare earth light conversion agent, the light conversion layer prepared by the application can efficiently convert LED chip blue light into high-color-purity orange red light.