7results about How to "Improve anti-sintering performance" patented technology

This invention discloses a high-temperature oxidation-resistant and corrosion-resistant coating, its preparation method, and its application. The coating comprises a NiCrAlY alloy binder layer and a YSZ ceramic layer. The NiCrAlY layer contains 19-23% Cr, 3-5% Al, 0.01-0.9% Y, with the balance being Ni. The YSZ layer is ZrO2 doped with 5-8 wt% Y2O3. The thickness of the NiCrAlY layer is 50-150 μm, and the ratio of the thickness of the YSZ layer to the thickness of the NiCrAlY layer is (1-2.5):1. By combining the properties of the NiCrAlY and YSZ layers with the spraying process, the above coating can effectively suppress metal oxidation during spraying, reduce oxide inclusions, and improve the purity and toughness of the coating. Furthermore, by considering the coating composition and structure, it can suppress the YSZ phase transformation, delay TGO growth, and improve the coating's anti-sintering properties.

The application discloses a mesoporous hollow sphere assembly structure catalyst and a preparation method and application thereof, and belongs to the technical field of hydrogen production by methane decomposition. The preparation method comprises the following steps: dissolving Ni salt, Al salt and Ce salt in a solvent, and controlling the molar ratio of Ni, Al and Ce to be 7:(1-2.5):(0.5-2); obtaining atomized liquid drops through atomization, and performing a decomposition reaction on the atomized liquid drops at 400-500 DEG C; collecting reaction products, drying, and then calcining by heating to 550-700 DEG C to obtain a catalyst precursor; and performing reduction treatment on the catalyst precursor in a reducing atmosphere, and the mesoporous hollow sphere assembly catalyst with a cerium-doped regulated interface is obtained. The catalyst exhibits remarkable high mass space velocity long-term stability and anti-coking performance in the methane catalytic decomposition reaction.

The invention relates to the technical field of thermal barrier coating materials, and discloses an anti-sintering pyrochlore and fluorite double-phase high-entropy rare earth zirconate thermal barrier coating material and a preparation method thereof. The chemical composition of the thermal barrier coating material is (La < 0.2 > Sm < 0.2 > Dy < 0.2 > Yb < 0.2 > Sc < 0.2 >) < 2 > Zr < 2 > O < 7 >, (La < 0.2 > Sm < 0.2 > Yb < 0.2 > Sc < 0.2 > Y < 0.2 >) < 2 > Zr < 2 > O < 7 >, and (La < 0.2 > Nd < 0.2 > Yb < 0.2 > Lu < 0.2 > Sc < 0.2 >) < 2 > Zr < 2 > O < 7 >. The preparation method comprises the following steps: S1, preparing a solution according to a molecular formula; s2, performing reverse coprecipitation on the solution obtained in the step S1 to prepare a material; and S3, pre-sintering the material obtained in the step S2, and sintering for the second time to obtain the high-entropy rare earth zirconate thermal barrier coating material. The grain size and the grain growth speed of the pyrochlore and fluorite double-phase high-entropy rare earth zirconate designed by adopting the method are obviously reduced, and the sintering resistance is better.

The invention relates to the technical field of catalysts, and discloses a high-efficiency catalyst for polyol synthesis and a preparation method thereof, the catalyst uses boron nitride with a hierarchical porous structure as a carrier, uses molybdenum and cobalt as active metal components, and performs surface modification through a specific organic ligand. The preparation method mainly comprises the following steps: carrier pretreatment, equivalent-volume impregnation loading of active components, temperature programming preliminary heat treatment, reduction activation under specific conditions, microwave-assisted surface modification and the like. The initial activity and selectivity of the catalyst are improved, it is guaranteed that the catalyst obtains high metal dispersity and excellent batch-to-batch stability, and the anti-sintering capacity and durability of the catalyst in the polyol synthesis reaction are improved.

The invention provides a catalyst for removing non-methane alkane and a preparation method of the catalyst. The catalyst for removing the non-methane alkane is prepared from the following raw materials: a Cu / MXene-Cr / Co doped g-C3N4-CeO2 composite carrier and a metal active component, through the synergistic effect of the composite carrier and the metal active component, the catalyst has excellent low-temperature catalytic activity, water resistance, sulfur resistance and cycling stability, can efficiently remove non-methane hydrocarbons in various waste gases, and has a wide application prospect.

The present application provides a kind of dehydrogenation catalyst and its preparation method and use, the dehydrogenation catalyst includes carrier Z and copper, chromium, element X and element Y supported on the carrier Z;With the total mass of dehydrogenation catalyst as benchmark, the copper content is 1-15wt%;The chromium content is 0.1-5wt%;The element X includes any one or at least two combinations of zinc, gallium, indium, tin or bismuth;Element Y includes any one or at least two combinations of magnesium, calcium, strontium or barium.The dehydrogenation catalyst of the present application uses copper as active component, chromium, element X and element Y as auxiliary, improves the selectivity of dehydrogenation catalyst to main product of dehydrocyclization, reaction by-product is less, anti-carbon, anti-sintering;And with low chromium and low copper design to reach moderate dehydrogenation activity, avoid reaction too concentrated and cold point too low, can be used for diol efficient dehydrogenation reaction, has large-scale popularization prospect.

The application discloses a preparation method of carbon sphere loaded small-size platinum group metal nanoparticles. The method comprises the following steps: adding a dopamine hydrochloride solution into a mixed solution of ethanol, water and ammonia water, stirring and reacting to prepare polydopamine microspheres, adding a ruthenium ion salt and a platinum group metal ion salt, stirring to enable the polydopamine microspheres to fully adsorb the ruthenium ion and the platinum group metal ion, and finally calcining the polydopamine microspheres with the adsorbed metal ions in an inert atmosphere at high temperature to prepare the carbon sphere loaded small-size platinum group metal nanoparticles. The carbon sphere loaded platinum group metal nanoparticles prepared by the method have small size, uniform distribution and an average particle size of 2-3 nm. The method is simple, suitable for preparation of various small-size platinum group metal nanoparticle materials and easy for large-scale production.