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 attapulgite, diopside, montmorillonite, sylvite, basalt and bloedite porous materials by the aid of lithium hypochlorite and bis (acetylacetone) beryllium; adding chlorinated bis-octadecyl methyl-2-hydroxyethyl ammonium 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 (3-trifluoroacetyl-D-camphor) praseodymium (III), 1, 1, 1-trifluoroacetylacetone neodymium, terbium acetate hydrate, tri-(6, 6, 7, 7, 8, 8, 8-heptafluoro-2, 2-dimethyl-3, 5-octene diketone) dysprosium (III) rare earth metal organic compounds, ferrous fumarate, cobalt gluconate, dichlorotetraaminopalladium and tetrachloro iridium dihydrate in hydrothermal reaction kettles under the effect of dimethyl dodecyl (2-hydroxyl) ethylamine hydrochloride 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 bis-octadecyl methyl-2-hydroxyethyl ammonium is used as a surfactant. The borax and the potassium sulfate are used as composite mineralizers, the tri (3-trifluoroacetyl-D-camphor) praseodymium (III), the 1, 1, 1-trifluoroacetylacetone neodymium, the terbium acetate hydrate and the tri-(6, 6, 7, 7, 8, 8, 8-heptafluoro-2, 2-dimethyl-3, 5-octene diketone) dysprosium (III) rare earth metal organic compounds are used as catalytic active auxiliary precursors, the ferrous fumarate, the cobalt gluconate, the dichlorotetraaminopalladium and the tetrachloro iridium dihydrate are used as catalytic active central components, the ferrous fumarate is a common transition metal organic compound, and the dichlorotetraaminopalladium and the tetrachloro iridium dihydrate are precious metal compounds.

Description

technical field [0001] The invention relates to a preparation method of a solid catalyst for ozone heterogeneous oxidation, which belongs to the technical fields of environmental protection and chemical catalysts. Background technique [0002] Ozone oxidation technology utilizes the strong oxidation ability of ozone, 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, and the low utilization rate of ozone leads to high water treatment operation costs. Ozone heterogeneous catalytic oxidation technology has the advantages of easy separation and recovery of catalysts and reusable use, high ozone utilization rate, and high removal rate of organic pollutants, which reduces water treatment. The ad...

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