The invention discloses an SCR denitration catalyst and a preparation method thereof. According to the denitration catalyst, a titanium oxide and a zirconium oxide serve as carriers, a manganese oxide serves as an active constituent, and a cerium oxide serves as a cocatalyst; the preparation method of the catalyst comprises the following steps of weighing a precursor of the titanium oxide, namely titanium tetrachloride, a precursor of the zirconium oxide, namely ZrOCl2.8H2O, a precursor of the manganese oxide, namely manganese nitrate solution and a precursor of the cerium oxide, namely cerous nitrate, according to the mole ratio, preparing a TiO2-ZrO2 carrier through a coprecipitation method, adding the carrier to the manganese nitrate solution, mixing and dissolving the constituents into deionized water, adding the cerous nitrate, conducting stirring and dipping, and after moisture is evaporated to dryness, conducting drying, grinding and calcination, so that the CeO2-MnO2/TiO2-ZrO2 catalyst is obtained. The catalyst prepared through the preparation method is low in activation temperature and extremely high in denitration efficiency and anti-sulfur performance; meanwhile, the preparation method is simple in material adoption, convenient to operate and capable of achieving industrialized production easily.

SCR denitration catalyst and preparation method thereof

The invention relates to a food-grade titanium dioxide producing system and technology, and belongs to the technical field of food additives. The producing technology includes the steps that industrial-grade titanium dioxide is used as a raw material, the raw material and deionized water are mixed and stirred into slurry, the slurry is ground and smashed through a grinding machine, the ground slurry is ultrasonically vibrated and filtered to extract titanium dioxide out, the titanium dioxide is sequentially washed with water, acetic acid and water, the titanium dioxide is ultrasonically vibrated and filtered once after each washing, and then the obtained titanium dioxide is dried to obtain food-grade titanium dioxide finally. According to the food-grade titanium dioxide producing system and technology, the extraction working procedure is improved to be ultrasonic vibration and filtration to replace an extraction mode, and an extraction reagent is prevented from be left over; by means of the depolymerization action of ultrasonic vibration, virulence residue in the final product due to dispersant utilization is avoided. The food-grade titanium dioxide obtained by using the producing technology is low in impurity content and high in quality.

Food-grade titanium dioxide producing system and technology

The invention discloses an antibacterial nutrient liquid for flowers and plants. The antibacterial nutrient liquid comprises the following components in parts by weight: 5-10 parts of potassium nitrate, 0.5-3 parts of boric acid, 10-20 parts of calcium phosphate, 10-15 parts of urea, 20-30 parts of potassium dihydrogen phosphate, 2-5 parts of zinc phosphate, 5-8 parts of calcium superphosphate, 10-30 parts of magnesium sulfate, 50-80 parts of deionized water and 2-5 parts of nanometer titanium oxide. The invention also discloses a preparation method of the antibacterial nutrient liquid for flowers and plants. The preparation method is simple and easy to operate and the antibacterial nutrient liquid for flowers and plants prepared by the preparation method has strong antibacterial capability, is non-toxic and environmentally friendly and can elongate the growth cycle of the flowers and plants and maintain bright colors of the flowers and plants.

Antibacterial nutrient liquid for flowers and plants and preparation method thereof

The invention discloses a soil restoration agent containing loaded nano titanium dioxide. The soil restoration agent can be used for restoring soil polluted by heavy metal and organic pollutants. Thesoil restoration agent comprises loaded nano titanium dioxide and straw powder, and the loaded nano titanium dioxide is prepared by loading anatase nano titanium dioxide and tin doped modified anatasenano titanium dioxide onto fumed silica and coal ash. The soil restoration agent can effectively reduce heavy metal ions in soil to lower heavy metal content in planted crops, effectively degrade organic pollutants in the soil, remarkably improve pollution degree of polluted soil and improve cultivation performance of the soil. Inorganic fertilizer and/or organic fertilizer can be added selectively into the soil restoration agent to increase nutritional fertility of the soil and promote crop growth, and effects of improving crop yield and quality are realized.

Soil restoration agent containing loaded nano titanium dioxide

The invention provides a production method of self-cleaning nan-coatings capable of exciting photocatalysts in visible light. Nano-titanium dioxide in the self-cleaning nan-coatings prepared by the method has good photocatalytic activity and strong oxidation-reduction capability, excellent ability of degradation for halides, cyanides, surfactants, nitrogenous organic compounds and industrial wastewater, and good capacity of decomposition for toluene, formaldehyde, xylene and oxynitride in air, thereby having a good decomposition function for PM2.5 in air. The modified nano-titanium dioxide has good compatibility with organic solutions, therefore, can be well dispersed in self-cleaning organic coatings without settling, guarantees system stability, and can excite the photocatalysts in the visible light.

Production method of self-cleaning nan-coatings capable of exciting photocatalysts in visible light

The invention relates to a plant growth sterilization accelerator and a preparation process for the same. The plant growth sterilization accelerator consists of 30+/-3 percent of TiO2, 35+/-3 percent of chitosan, 4+/-3 percent of emulsifier OP-10, 9+/-3 percent of sodium phosphite solution and 22+/-3 percent of citric acid. The preparation process comprises the steps of preparing modified TiO2 nanopowder, preparing nanometer titanium dioxide/chitosan treating fluid, preparing a sustained-release coating film, and performing mixing while stirring to prepare the plant growth sterilization accelerator. The plant growth sterilization accelerator and the preparation process have the beneficial effects that the sustained-release coating film contains TiO2, chitosan, the emulsifier, the sodium phosphite solution and the citric acid, so that the effects of the accelerator can be retarded, the efficacy of the accelerator sprayed on the leaves of plants can last long and is persistent, and the production cost of crops is reduced.

Plant growth sterilization accelerator and preparation process for same

The invention relates to a preparation method of self-cleaning paint based on modified nano titanium dioxide, which comprises a process of preparing nano titanium dioxide, improved treatment of the nano titanium dioxide and a process of preparing the self-cleaning paint from the modified nano titanium dioxide. The key lies in that, the process of preparing the self-cleaning paint from the modified nano titanium dioxide comprises the following steps: c1, preparing raw materials in percentage by mass according to the specification; c2, adding fluorinated polyurethane into a round-bottom container with a reflex condenser and a stirrer; c3, adding modified nano titanium dioxide powder, acetone solvent and sodium diacetate emulsifier into the container, and heating to 80 DEG C; and c4, finally adding KH-570 silane coupling agent, organic silicon defoaming agent, alkyl modified organosiloxane leveling agent and polyurethane thickening agent, and dispersing for 15 minutes to obtain the final self-cleaning paint.

Preparation method of self-cleaning paint based on modified nano titanium dioxide

The invention discloses a double-treatment cleaning and regenerating method for a vanadium-titanium based denitration catalyst and aims to solve the technical problem that the regenerating effect of the traditional vanadium-titanium based denitration catalyst is not so good. According to the technical scheme, the double-treatment cleaning and regenerating method comprises the following steps of: introducing air-ozone mixed gas into a catalyst regenerating reactor, and carrying out oxidation treatment to obtain a regenerated vanadium-titanium based denitration catalyst; then, placing the regenerated vanadium-titanium based denitration catalyst into a catalyst activity liquid, dipping the regenerated vanadium-titanium based denitration catalyst for 4-6h, then, taking out the regenerated vanadium-titanium based denitration catalyst, drying the regenerated vanadium-titanium based denitration catalyst in dry air at 50-60 DEG C for 1-3h, and then, repeating the operation once; and then, roasting the regenerated vanadium-titanium based denitration catalyst at the temperature of 160-200 DEG C for 1-3h, and then, roasting the regenerated vanadium-titanium based denitration catalyst at the temperature of 300-400 DEG C for 1-3h to obtain the cleaned and regenerated vanadium-titanium based denitration catalyst. The double-treatment cleaning and regenerating method has the beneficial effects that the denitration ratio of the regenerated vanadium-titanium based denitration catalyst can be up to 87%, so that efficient regeneration is realized, meanwhile, the conversion ratio of SO2/SO3 is effectively reduced, and the denitration cost is greatly reduced.

Zhang Jianping

Papers

Plant growth sterilization accelerator and preparation process for same

Preparation method of self-cleaning paint based on modified nano titanium dioxide

Double-treatment cleaning and regenerating method for vanadium-titanium based denitration catalyst

Food-grade titanium dioxide producing system and technology

Soil restoration agent containing loaded nano titanium dioxide