2results about How to "No significant decrease in activity" patented technology

This invention belongs to the field of nanomaterials and catalytic chemistry, and discloses a chiral high-entropy ceramic electrocatalyst prepared based on a ligand-controlled collapse mechanism. In the synthesis of this catalyst, multiple transition metals are first introduced into a zeolite imidazole ester (ZIF) precursor to construct high-entropy nodes, and then grafted with sterically hindered chiral functional organic ligands exhibiting thermal retardation effects. Through a unique kinetic retardation effect, the metal aggregation rate is slowed down during pyrolysis, allowing the carbon-nitrogen framework to complete directional helical assembly before metal melting, ultimately forming a ceramic structure with atomically high-entropy active sites and macroscopic chiral channels. The catalyst prepared by this invention exhibits high specific surface area and enantioselectivity, making it particularly suitable for the in-situ synthesis of chiral intermediates under extreme aerospace environments.

This invention discloses a method for preparing phenolic chemicals by hydrogenolysis of lignin catalyzed by a cobalt-based nitrogen-carbon composite material. Using organosoluble lignin as raw material, a cobalt-based nitrogen-carbon composite material as catalyst, and a mixed solvent of small organic molecule alcohol and formic acid, the reaction is carried out under an inert gas atmosphere of 0.5–3 MPa, maintaining a reaction temperature of 210–250 °C, and a reaction time of 2–6 h. This method catalyzes the depolymerization of lignin to obtain a series of p-hydroxyphenyl products, achieving high-value utilization of lignin. The lignin conversion rate of this invention is as high as 89.6%, the total yield of monophenolic products can reach 17.7%, of which the yield of p-hydroxyphenyl products reaches 9.0%, with a selectivity of 50.8%. The catalyst preparation process used in this invention is simple and can catalyze the hydrogenolysis of lignin by short-chain alcohols and carboxylic acid solvents under mild conditions to obtain high-value-added chemicals such as p-hydroxyphenyl products.