8 results about "Zirconium nitrate" patented technology

The present application relates to gas adsorption material technical field, especially to Fe-Ce-Zr three metal MOFs derived carbon material and its preparation method and application, the preparation method of the present application takes iron nitrate, cerium nitrate, zirconium nitrate as metal source, phthalic acid as organic ligand, realizes the coordination assembly of metal ion and ligand through the solvothermal method, and prepares Fe-Ce-Zr three metal MOF;Again under argon atmosphere, with 10~12 ℃ / min heating rate, heat to 600~800 ℃, and bake 2~4h, make organic ligand in situ carbonization into porous carbon skeleton, and metal node converts into high dispersion metal oxide, finally obtains the Fe-Ce-Zr three metal MOFs derived carbon material with porous structure, multi-metal active site and carbon matrix.

This invention discloses a method for crystallizing sodium nitrate in the field of inorganic salt crystallization technology. The method involves dissolving sodium nitrate raw material in deionized water and filtering. Magnesium-aluminum-silicon-boron composite layered oxygen hydroxyl compound nanosheets anchored with fluorine-containing cerium-zirconium hydroxide-hydrated oxides are added to the filtrate. The mixture is then dispersed under heat, cooled in stages, seeded with sodium nitrate under reduced pressure, evaporated under reduced pressure, crystallized under heat, centrifuged, washed with a saturated sodium nitrate solution, and dried to obtain sodium nitrate crystals. The fluorine-containing cerium-zirconium hydroxide-hydrated oxide-anchored magnesium-aluminum-silicon-boron composite layered oxygen hydroxyl compound nanosheets are obtained through co-precipitation of magnesium, aluminum, cerium, and zirconium nitrates, heat treatment with fluorine-containing water, silicon-boron composite modification, and heat-treated grinding and spray drying. This invention can regulate the nucleation and growth of sodium nitrate crystals, improve crystal particle size uniformity, reduce mother liquor entrainment, and improve crystal separation and drying effects.

Disclosed in the present invention are a preparation method for a catalyst for a dehydration-condensation reduction reaction, the resulting product and the use. The preparation method comprises the following steps: spreading activated carbon evenly in a fixed bed, then continuously introducing a mixed solution of copper nitrate, zinc nitrate and zirconium nitrate into the fixed bed, and enabling the mixed solution to be in full contact with an activated carbon layer; roasting the activated carbon which is in full contact with the mixed solution, so as to obtain activated carbon loaded with copper oxide-zinc oxide-zirconium oxide; and dispersing the active carbon loaded with copper oxide-zinc oxide-zirconium oxide into an organic solvent, then adding a sulfiding agent, subjecting same to a sulfurization reaction, and filtering, washing and drying same after the reaction, so as to obtain the catalyst for a dehydration condensation reduction reaction. The preparation method for a catalyst of the present invention is simple and convenient to operate, low in cost and small in environmental pollution, can be applied to the dehydration condensation reduction reaction of various ketones or aldehydes and amines, improves the selectivity of the reaction, reduces side reaction products, and has a good catalytic effect and industrial development prospects.

The application provides a kind of ceramic phase doped magnesium-based thermal shock resistant refractory material and its preparation method, and belongs to the field of ceramic doped refractory material.The refractory material includes modified magnesia particles, modified magnesia fine powder, modified composite ceramic powder, TiC-Al2O3 complex phase powder, grain boundary pinning agent, etc.The modified magnesia particles are prepared by impregnating electrically fused magnesia with a modified solution prepared from zirconium nitrate, lanthanum nitrate, cetyltrimethylammonium bromide and ethanol aqueous solution, and then calcining.The modified magnesia fine powder is prepared by crushing and ball milling the modified magnesia particles.The modified composite ceramic powder is prepared by mixing calcium oxide, lanthanum oxide, zirconium oxide, silicon dioxide and alpha-silicon nitride, and then wet ball milling, pressing into a block, sintering, crushing and dry ball milling.The grain boundary pinning agent is prepared by mixing lanthanum nitrate, cerium nitrate and yttrium nitrate, then mixing with zirconium oxychloride and deionized water, and then precipitating and calcining.The multi-component synergistic modification and multi-level structure design enable the material to maintain good performance under high temperature, sudden temperature change and slag erosion.

This invention provides a production process for tetramethylpiperidinone and a method for preparing its catalyst, belonging to the technical field of tetramethylpiperidinone. The catalyst preparation method includes preparing a composite sol, preparing catalyst precursor powder, post-treatment, and calcination. The preparation of the catalyst precursor powder involves adding cerium nitrate and zirconium nitrate to deionized water, adding tartaric acid and stirring until homogeneous, then adding the mixture to the composite sol at a controlled addition rate of 1.5-2.0 g / min and a pH value of 8.8-9.2. After addition, the mixture is kept at 55-60℃ for 4.0 h, washed, and freeze-dried to obtain the catalyst precursor powder. The tetramethylpiperidinone obtained using the production process of this invention has high yield and purity, and a long catalyst lifespan.

The application discloses a chlorine corrosion resistant supported catalyst and a preparation method and application thereof, and belongs to the technical field of electrocatalytic materials, and comprises the following steps: firstly, dispersing zirconium nitrate and metal salt in a solution, controlling the pH value of the solution to be weak alkaline, then aging and centrifuging to obtain a precursor A; finally, calcining the precursor A to obtain the chlorine corrosion resistant supported catalyst. The chlorine corrosion resistant supported catalyst and the preparation method and application thereof are used, the prepared chlorine corrosion resistant supported catalyst has rich Lewis acid sites, can adsorb Lewis base OH ‑ in seawater to generate a hydroxyl layer repelling Cl ‑ in seawater, so that the activity and stability of the catalyst are enhanced, and efficient seawater electrolysis is realized.

This invention discloses a zirconia-supported noble metal catalyst, its preparation method, and its application, belonging to the technical field of preparation and application of supported noble metal catalysts. Using zirconium nitrate as a precursor, zirconium hydroxide is obtained via co-precipitation, followed by high-temperature calcination to prepare a zirconia support with a specific crystal phase composition. Palladium nanoparticles are then loaded onto the ZrO2 surface using an impregnation-reduction method to obtain a Pd / ZrO2 catalyst. In the prepared catalyst, palladium nanoparticles are uniformly dispersed on the support surface, with an average particle size of 1.7 nm, and the support contains abundant acidic sites. This invention features a simple preparation method, low noble metal usage, and high catalyst activity, exhibiting excellent catalytic performance in the hydrogenation and deoxygenation of 5-hydroxymethylfurfural to 2,5-dimethylfuran. Under low acid conditions of 150 °C, 1.5 MPa H2, and formic acid as the hydrogen donor, complete HMF conversion can be achieved, with a DMF selectivity of 83% and a conversion frequency of 224 h⁻¹. ‑1 Even after five cycles of use, it still maintains an 81% conversion rate and a 61% selectivity, showing good prospects for industrial application.

The application discloses a low-temperature high-activity carbon dioxide methanation catalyst and a synthesis method thereof, relates to the field of carbon dioxide methanation, and adopts an impregnation method to disperse nanometer oxides on the surface of active components and carriers, obtains the methanation catalyst through low-temperature calcination, selects Ni as a main active component, dopes trace Ru (<1%) to form an alloy, uses cerium as a carrier, uses zirconium as a cerium oxide stabilizing agent, uses a cerium-zirconium nitrate solution as an impregnation liquid of surface oxides, and then carries out calcination and reduction treatment to prepare the catalyst. The catalyst prepared by the application has sufficient active sites on the surface of the carrier, the content of nickel is reduced, and the catalytic efficiency of carbon dioxide methanation at low temperature is greatly improved.