62results about How to "Good performance repeatability" patented technology

The invention discloses a copper based catalyst used for hydrogenating carbon dioxide to synthesize methanol, and a preparation method and an application thereof. The preparation method of the catalyst comprises the following steps: 1, processing a zinc salt, an aluminum salt, a zirconium salt and a stabilizer to prepare a first solution, or processing the zinc salt, the aluminum salt and the zirconium salt to prepare a second solution; 2, processing carbonate and hydroxide to prepare a third solution; 3, processing a copper salt to prepare a fourth solution; 4, processing the first solution and the third solution to form a first precipitation solution, or processing the second solution and the third solution to form a second precipitation solution; 5, adding the fourth solution to the first precipitation solution to form a third precipitation solution or adding the fourth solution to the second precipitation solution to form a fourth precipitation solution, ageing after Cu in the precipitation solution precipitates, and washing; and 6, drying, and calcining. The catalyst contains 30-50% of Cu, 20-40% of Zn, 10-20% of Al, and 5-20% of Zr. The catalyst is used for a reaction for hydrogenating carbon dioxide to synthesize methanol.

The invention provides a solid base catalyst for synthesizing dimethyl carbonate through a transesterification method. The components are Ca-Al-O-X, wherein the mole content of Ca ranges from 15% to 35%, the mole content of Al ranges from 5% to 30%, the mole content of X ranges from 0.1% to 10%, the balance is O, and X is CO3<2-> or NO3<-> or F<-> or Cl<-> or Br<->. The solid base catalyst has the advantages that the use temperature is low, the conversion rate of propylene carbonate under the low-temperature condition is high, and the yield of dimethyl carbonate is high.

Provided are a catalyst for room-temperature catalytic oxidation of formaldehyde pollutants and a preparation method and application thereof. Alumina monohydrate (AlOOH) is used as a carrier, precious metals Pt and Pd are supported on the AlOOH by adopting an impregnation method and the like, and the catalyst capable of conducting efficient catalytic oxidation on formaldehyde in the polluted air under normal pressure and room temperature into harmless carbon dioxide and water is obtained. The AlOOH carrier is prepared through direct calcination of aluminum hydroxide, and its preparation process is simple and repeatable, the surface area is larger, and lots of hydroxyl groups are produced. Nitrate is used as a precursor solution, the prepared Pt / AlOOH or Pd / AlOOH catalyst has higher dispersion degree of precious metals, and thus a more excellent room-temperature formaldehyde purification effect is obtained. Experimental tests show that the formaldehyde concentration is 80ppm in the air with the relative humidity RH of 0-80%, and the formaldehyde conversion rate of catalytic oxidation of the catalyst can be kept to 100% for a long time.

The invention discloses a catalyst for synthesizing methanol through CO2 hydrogenation, comprising Cu, Zn, Al, X, halogen and oxygen elements, oxides and halides, wherein the molar ratio of [Cu+Zn+MA] to [Al+Mb] is 2-18; the molar ratio of Cu to Zn is 0.5-5; the molar ratio of MA to [Cu+Zn] is 0-5; the molar ratio of MB to Al is 0-9; the molar ratio of halogen to Al is 0.05-5; MA and MB cannot be 0 at the same time; MA represents a mono-valent or divalent metal ion in X; MB represents a trivalent and / or tetravalent metal ion in X; X is one or a combination of more elements of Li, K, Mg, B, Ga, In, transition metal elements and rare-earth metal elements. The catalyst has the advantages of high carbon dioxide conversion rate, good methanol selectivity and high methanol yield.

A noble metal modified Cu / ZrO2-based catalyst for synthesizing methanol contains proportionally Cu, Zr and Pd or Ag. It is prepared through mixing the mixed solution of copper nitrate and zirconium oxychloride with the solution of sodium carbonate, stirring, codepositing, keeping pH=9-11, washing with distilled water, drying, calcining, cooling, tabletting, pulverizing, immersing in the solution of palladium (or silver) nitrate, and infrared baking.

The invention describes a preparation method of a simulated wood anti-sulfuration material for polyether polyurethane shoes. The simulated wood anti-sulfuration material is prepared by a chemical reaction of component A and component B . The component A is a mixture of polyether polyol A (functionality f equals 3, and OH equals 26-28mgKoH / g), polyether polyol B (functionality f equals 2, and OH equals 26-28mgKoH / g), polyether polyol C (GR-4110), a polyurethane crosslinking agent, a foam stabilizer, a foaming agent, a catalyst and the like; and the component B is a prepolymer of the polyether polyol B (functionality f equals 2, and OH equals 26-28mgKoH / g), 4,4-diphenyl diisocyanate (MDI) and polyphenylpolymethylene isocyanate (raw MDI).