Method for preparing ozone heterogeneous oxidation solid catalysts

Abstract

The invention relates to a method for preparing ozone heterogeneous oxidation solid catalysts, and belongs to the technical field of environmental protection and chemical catalysts. The method includes carrying out pore expansion and modification on carriers which are purification diatom, kyanite, nitratine, dolomite, amazonite and lithium hydroxyapatite porous materials by the aid of lithium hypochlorite and bis (acetylacetone) beryllium; adding chlorinated dodecyl dimethyl hydroxyethyl ammonium chloride into the carriers and carrying surface activation treatment on the carriers under the effects of ultrasonic waves; carrying out hydrothermal reaction on the carriers which are subjected to ultrasonic surface activation, borax, potassium sulfate, tri (hexafluoroacetylacetone) yttrium (III) dihydrate, samarium acetylacetone, tri-[4, 4, 4-trifluoro-1-(2-thiophene)-1, 3-butanedione] europium, holmium oxalate decahydrate rare earth metal organic compounds, vanadium pyruvic acid isonicotinyl hydrazone, nickel citrate, cupric glutamate and tetrachloro iridium dihydrate in hydrothermal reaction kettles under the effect of N-dimethyl dodecyl-N'-trimethyl-2-hydroxypropyl ammonium dichloride which is an emulsifier; drying reaction products to remove moisture; burning the reaction products in muffle furnaces at the certain temperatures to obtain the ozone heterogeneous oxidation solid catalysts. The chlorinated dodecyl dimethyl hydroxyethyl ammonium chloride is used as a surfactant. The borax and the potassium sulfate are used as composite mineralizers, the tri (hexafluoroacetylacetone) yttrium (III) dihydrate, the samarium acetylacetone, the tri-[4, 4, 4-trifluoro-1-(2-thiophene)-1, 3-butanedione] europium and the holmium oxalate decahydrate rare earth metal organic compounds are used as catalytic active auxiliary precursors, the vanadium pyruvic acid isonicotinyl hydrazone, the nickel citrate, the cupric glutamate and the tetrachloro iridium dihydrate are used as catalytic active central components, the vanadium pyruvic acid isonicotinyl hydrazone is a common transition metal organic compound, and the tetrachloro iridium dihydrate is a precious metal compound.

Description

technical field [0001] The invention relates to a preparation method of an ozone heterogeneous oxidation solid catalyst, belonging to the technical field of environmental protection and chemical catalysts. Background technique [0002] Ozone oxidation technology utilizes the characteristics of strong ozone oxidation ability, which can oxidize and decompose many organic pollutants, and is widely used in wastewater treatment. Ozone catalytic oxidation technology is divided into ozone homogeneous catalytic oxidation and ozone heterogeneous catalytic oxidation. Ozone homogeneous catalytic oxidation has catalysts that are difficult to separate, recycle and reuse. Low ozone utilization leads to high operating costs for water treatment. At the same time, organic pollutants are removed. The low rate and easy to cause secondary pollution of water body limit its application; the ozone heterogeneous catalytic oxidation technology has the advantages of easy separation, recovery and reus...

AI Technical Summary

Problems solved by technology

[0004] In view of the problems of low catalyst adsorption, poor anti-toxicity and easy loss of catalytic activity in the current preparation method of ozone heterogeneous oxidation solid catalyst, a multi-component porous carrier was developed to enhance the adsorption of the catalyst through pore expansion and surface activation. Rare earth metal organic compounds as precursors of catalytic active additives, common transition metal organic compounds and noble metal compounds as precursors of catalytic active centers and multi-component porous carriers through hydrothermal reaction and high temperature calcination to prepare ozone heterogeneous oxidation containing multiple metals The preparation method of solid catalyst to improve the anti-toxicity and catalytic activity of the catalyst is characterized in that component A and deionized water are added into a sealable reactor and stirred to prepare an aqueous solution, and the weight concentration of component A is controlled to be 2% to 6%. After the preparation is completed, add component B under stirring, raise the temperature to 35°C-50°C, continue to stir for 3h-6h, filter, and dry the reaction product at 102°C-106°C to obtain a modified carrier for pore expansion; pore expansion Put the modified carrier into the ultrasonic reactor, add the aqueous solution prepared by C component and deionized water, the weight concentration of C component is 3%~8%, stir and mix evenly, control the ultrasonic power density to 0.3~0.8W / m 3 , frequency 20kHz ~ 30kHz, 40 ℃ ~ 55 ℃, ultrasonic vibration 2h ~ 5h, the ultrasonic surface activation carrier mixture is obtained; the ultrasonic surface activation carrier mixture is transferred to the hydrothermal reaction kettle, and then add D component and deionized water to prepare The aqueous solution, the weight concentration of D component is 40% ~ 55%, by weight, the weight ratio of D component deionized aqueous solution: ultrasonic surface activation carrier mixture = 1: (1.5 ~ 2), control temperature 120 ℃ ~ 180°C, the hydrothermal reaction time is 8h~16h, and then dried to obtain fine particles; the fine particles are burned in a muffle furnace at 600°C~950°C for 3h~8h to obtain a solid catalyst for ozone heterogeneous oxidation