The invention discloses a Pd/Ce08Zr02O2/cordierite honeycomb ceramic monolithic catalyst, a preparation method and application thereof The catalyst is prepared by taking cordierite honeycomb ceramic which is eroded by hydrochloric acid as a first carrier, a cerium-zirconium composite oxide as a second carrier, and a precious metal, namely palladium (Pd) as an active ingredient; preparing a cerium-zirconium composite coating on the cordierite carrier by an immersion method; immersing the carrier into plating solution; and directly reducing palladium onto the cordierite honeycomb ceramic coated with the cerium-zirconium composite coating by the redox reaction of palladium chloride and sodium hypophosphite and the self-catalysis of the palladium The preparation method improves the oxygen storage performance of the catalyst, improves high-temperature resistance, and realizes uniform load of nano-palladium particles on the carriers without embedding active sites; moreover, the using amount of the palladium is small, the utilization rate of the palladium is improved, the process is simple, the preparation period is short, and the production cost is low The monolithic catalyst prepared by the method has high activity and high stability; and the methylbenzene can be oxidized into harmless carbon dioxide (CO2) and water (H2O) in the presence of the catalyst at the temperature of 220 to 300 DEG C

Pd/Ce0.8Zr0.2O2/cordierite honeycomb ceramic monolithic catalyst, preparation method and application thereof

The invention belongs to the field of catalyst materials for waste water treatment, and provides a supported advanced oxidation catalyst material and a preparation method thereof. The method includes the steps: (1) pre-treating carrier materials; (2) placing the pretreated carrier materials into plating solution with a pH (potential of hydrogen) value of 3-13, stirring mixture for at least 5 minutes at the temperature ranging from 30 DEG C to 90 DEG C, performing solid-liquid separation, cleaning a solid phase by the aid of water and organic solvents, and drying the cleaned solid phase to chemically-plated carrier materials; (3) aerobically roasting the chemically-plated carrier materials for 1-8 hours at the temperature ranging from 200 DEG C to 1000 DEG C to obtain the catalyst material. According to the catalyst material, metal oxides are uniformly loaded on the surfaces of the carrier materials, binding force among the loaded metal oxides and the carrier materials can be effectively improved, loading capacity is improved, the service life of the catalyst material is prolonged, catalytic activity is improved, and secondary pollution caused by metal ion leaching is effectively relieved.

Supported advanced oxidation catalyst material and preparation method thereof

The invention discloses a method for preparing a cellular integrated combustion catalyst by loading low-content valuable palladium on a stainless steel wire gauze substrate by using a chemical plating technique. In the preparation method of the invention, the valuable metal can be loaded directly without precoating an aluminum oxide film on the surface of the stainless steel wire gauze substrate,so the preparation method is more simple and convenient; and the palladium component in the prepared catalyst is firmly loaded on the surface of the wire gauze substrate, and peeling and stripping phenomena in bending and adhesive tape adhering tests are eliminated. Meanwhile, the valuable metal palladium content in the integrated combustion catalyst prepared by the invention is only 0.1 to 0.5 weight percent, but when the catalyst is used in the catalytic combustion purification treatment of methylbenzene, the methylbenzene conversion rate at a low temperature of about 220 DEG C reaches over90 percent, and the catalyst has a good low-temperature catalytic purification effect.

Preparation method and use of palladium-based cellular integrated combustion catalyst

The invention belongs to the semiconductor optoelectronic material and device preparation technology field, and discloses a method for rapid preparation of large-area perovskite crystals. The method comprises the following steps: certain amounts of lead halide and methyl ammonium halide are weighed, mixing is carried out, then 1,4-butyrolactone, dissolving is carried out, and a perovskite solution is prepared; then the prepared perovskite solution is added to an organic solvent with a certain amount, and perovskite crystals are precipitated. Perovskite crystals are precipitated rapidly through a solution extraction mode, the method is simple and practical, the repeatability is high, external requirements are not high, different organic solvents can be selected for growth according to practical demands to obtain monocrystalline particles with different sizes, the maximum monocrystalline particle size can reach dozens of micron and thus the monocrystalline particles have great advantages at the aspect of manufacturing of photoelectric devices.

Method for rapid preparation of large-area perovskite crystals

The invention provides an integral composite catalyst for catalytic combustion of VOCs (volatile organic compounds) and belongs to the technical field of catalytic combustion of industrial waste gas and resource utilization of catalytic materials. The catalyst is the integral composite catalyst formed by supporting main catalysts and a promoter under the action of a binder with cordierite as a first supporter and gamma-Al2O3 as a second supporter. The main catalysts comprise two or more of Fe2O3, NiO, CuO, Cr2O3 and MnO2, and the promoter is one or more of La2O3, ZrO2 and TiO2. The invention further provides a preparation method and an application of the catalyst. The raw materials of the composite catalyst are all non-precious metals, are low in cost, have high catalytic activity for industrial waste gas such as toluene or other VOCs and have low combustion temperature at high air speed; the catalyst is the integral composite catalyst and is more convenient and rapid to reduce and fill. The preparation method of the catalyst is simple, raw materials are easy to obtain, and the catalyst can be used for catalytic combustion of industrial waste gas such as toluene or VOCs.

Integral composite catalyst for catalytic combustion of VOCs (volatile organic compounds) as well as preparation method and application

The invention discloses a preparation method of an integral type catalyst with low content of noble metal and an application thereof. In the invention, the preparation method comprises the following steps of: adopting a chemical plating method, utilizing hydrazine or sodium hypophosphite as a reducer, generating an oxidation-reduction reaction with palladium chloride or chloroplatinic acid in a plating bath and depositing metallic Pd and/or Pt on the surface of a cordierite honeycomb ceramic pore canal directly under the autocatalytic action of Pd or Pt simultaneously so as to obtain a load-type integral type catalyst with low content of the noble metal of the Pt and/or the Pd; the integral type catalyst with the noble metal, which is prepared by the invention, is applied to the purifyingtreatment of the catalytic combustion of toluene; though the content of the noble metal in the integral type catalyst prepared by the invention is only 0.12-0.60wt%, the conversion rate of the toluene reaches 99% at the lower temperature of 186-244 DEG C when the integral type catalyst is used for the purifying treatment of the catalytic combustion of the toluene, and the concentration of the toluene is lowered below 40mg/m ; and the invention is the integral type catalyst for treating VOCs (volatile organic chemicals) by low-temperature catalytic combustion, which has lower cost, simple preparation and obvious purifying effect.

Preparation method of integral type catalyst with low content of noble metal and application thereof

The invention discloses a method for preparing single crystal perovskite type oxide and application thereof. The method comprises the following steps of: using NaOH as a mineralizer, slowly adding the NaOH solution into solution of metallic salt formed by MnO , Mn , La and Sr + dropwise, and continuously mechanically stirring the mixed solution; placing the mixed solution in ultrasonic wave for ultrasonic dispersion, placing the mixed solution in a reaction kettle to perform a hydrothermal reaction at the temperature of between 220 and 270 DEG C, and naturally cooling the mixed solution to the room temperature; and centrifuging the obtained products by deionized water and absolute ethyl alcohol for three times respectively, drying the products at the temperature of 80 DEG C for 24 hours, and grinding the products to obtain the cube-shaped single crystal perovskite type oxide of La0.5Sr0.5MnO3-delta. The catalyst of the single crystal perovskite type oxide has the advantages of high low-temperature catalytic activity, stable structure, high thermal-shock resistance and no high-temperature roasting; and the single crystal perovskite type oxide is also suitable for the treatment of the low-concentration toluene and the effective treatment of environmental pollution, particularly the catalytic combustion of the toluene at a high space velocity.

Ming Sun

Papers

Preparation method of integral type catalyst with low content of noble metal and application thereof

Method for preparing single crystal perovskite type oxide and application thereof