7results about How to "Guaranteed selectivity" patented technology

This invention discloses an In-Co-Zr composite catalyst, its preparation method, and its application, relating to the technical field of hydrogenation catalysts. The In-Co-Zr composite catalyst comprises an In₂O₃ support and an active component and structural promoter Zr supported on the In₂O₃ support, wherein the active component includes CoIn. x and Co3InC 0.75 The molar ratio of In, Co, and Zr in the composite catalyst is (1-9):(1.5-2.5):1. The In-Co-Zr composite catalyst exhibits a uniform distribution of active components and a high density of active sites. In the catalytic hydrogenation of CO2 to methanol, it can improve CO2 conversion while ensuring high methanol selectivity, and also possesses good heat resistance and anti-sintering properties. Under reaction conditions of 310℃, the CO2 conversion rate reaches 17.4% and the methanol selectivity reaches 77.7% during the catalytic hydrogenation of CO2 to methanol.

The present application belongs to the technical field of natural product chemical modification, and particularly relates to a chemically modified rare ginsenoside derivative, a preparation method and application thereof. The present application takes rare ginsenoside as raw material, introduces a sulfate group by sulfating modification on the rare ginsenoside to obtain a chemically modified rare ginsenoside derivative; the modifier used in the sulfating modification is a sulfonating agent. The rare ginsenoside is synthesized by conversion with ginsenoside Rb1 as raw material and AlCl3 as catalyst in an ethanol system. The modification method of the present application is simple in operation steps, does not require special equipment, is suitable for large-scale production, and has a broad application prospect in the field of drug preparation development and the like.

This invention relates to the field of mineral processing technology, and particularly to a depressant for molybdenum sulfide ore and a flotation separation method and application for copper-molybdenum sulfide minerals. The depressant comprises polyphenols; the polyphenols have the molecular formula C0.05. 32 H 30 O 11 The molecular weight is 590.57 g / mol, and the degree of polymerization is 2-11. The molybdenum sulfide mineral depressant is used for the flotation of copper-molybdenum sulfide minerals. The copper-molybdenum sulfide minerals contain chalcopyrite and molybdenite, with a mass ratio of 1-2:1. This invention provides a molybdenum sulfide mineral depressant and a flotation separation method and application for copper-molybdenum sulfide minerals. The aim is to solve the problems of high toxicity, high loss rate, and high intermingling of existing copper-molybdenum sulfide mineral separation flotation depressants, and to achieve effective separation of chalcopyrite and molybdenite.

The application discloses a method for preventing grade jumping trip of multi-point fault of multi-power distribution network, after detecting the fault, real-time calculation and record of the fault power direction, when the fault occurs in the positive direction of protection, sending the blocking signal to the bus side, when the fault occurs in the reverse direction of protection, sending the blocking signal to the tie side, when the detected fault power direction element only has a single direction, keeping the blocking signal output unchanged, when the positive direction of the fault power element and the reverse direction of the fault power element are detected at the same time, according to the power element direction and the received signal, adjusting the blocking signal output, not receiving the blocking signal, blocking release or receiving the blocking signal but exceeding the total timeout, the protection action outlet. The scheme is simple in configuration and clear in structure, through the fault power direction element judgment and the protection blocking signal, the relay blocking signal and the release blocking signal interaction, the selectivity of the protection action is ensured, the fast positioning and reliable isolation function of the multi-point fault of the multi-power distribution network are realized.

This invention provides a method for preparing a mixed matrix membrane for CO2 separation, including the preparation of an electrospinning precursor solution and electrospinning, the preparation of hollow ZnO nanotubes, the preparation of ZIF-8 hollow nanotubes, the preparation of a modified IL@MOF composite material, the preparation of a casting precursor solution and coating, and the preparation of a mixed matrix membrane for CO2 separation. The mixed matrix membrane for CO2 separation prepared by this invention has high permeability and high adsorption selectivity, and has high promotion and commercialization value.

This invention discloses a highly stable platinum / palladium-based ammonia oxidation catalyst with a bilayer gradient support, its preparation method, and its applications. The catalyst possesses a multi-level synergistic structure of "atomic-scale dispersed Pd or Pt / V-O-W oxide / hydroxylated TiO₂@(ZrO₂ / Al₂O₃ / CeO₂ or its composite oxide) bilayer gradient support," forming a Pd-O-V / Pt-O-V bonded electronic synergistic system and constructing a protective outer layer with a precise pore size of 2-5 nm. It is constructed through a precise sequential process including hydrothermal hydroxylation modification, atomic layer deposition, sol-gel, and low-temperature reduction post-treatment. The ammonia oxidation catalyst provided by this invention achieves a synergistic effect of intrinsic anti-poisoning and high activity over a wide temperature range. The ZrO₂-CeO₂ composite oxide outer layer further enhances its antioxidant protection capability; the atomic-scale dispersion of Pd or Pt achieves ultra-low loading and high atomic utilization, significantly reducing costs. This invention solves the core technical problems of traditional Pd or Pt-based catalysts being prone to poisoning and deactivation, and having poor low-temperature activity.

The application discloses a precoding matrix indication selection method based on a neural network. In the method, a user end first acquires a channel matrix of a downlink; then, the channel matrix is preprocessed by downsampling, segmented discrete Fourier transform and number domain conversion, so that input features suitable for neural network processing are obtained; then, the neural network is used for feature extraction and code word mapping on the preprocessed channel features, corresponding code word numbers are output for each subband, and the code word numbers are converted into precoding matrix indication (PMI) parameters; subsequently, the user end feeds back the PMI to a base station; and the base station maps corresponding precoding matrices according to the same predefined codebook and the received PMI, and the precoding matrices are used for downlink beamforming transmission. The application uses the neural network to replace a conventional traversal search type PMI selection process, reduces the calculation complexity of the user end under the premise of keeping compatibility with an existing codebook feedback mechanism, and improves the PMI selection efficiency.