Preparation method for solid catalyst for ozone heterogeneous oxidization

Abstract

The invention relates to a preparation method for a solid catalyst for ozone heterogeneous oxidization and belongs to the technical fields of environmental protection and chemical engineering catalysis. The preparation method comprises the following steps: by taking medical stone, wollastonite, activated carbon, carnallite, dolomite and calcite porous material as a carrier, modifying the carrier by broaching with lithium hypochlorite and bis(acetylacetone) beryllium, and then adding a surfactant tetradecyl tributyl ammonium chloride and performing surface activating treatment under the effect of ultrasonic wave; performing a hydrothermal reaction on an ultrasonic surface activated carrier, a compound mineralizer including borax and potassium sulphate, catalytic activated assistant precursors, including isopropoxy scandium (III), samarium 2,4-pentanedionate hydrate, tri[N,N-bi(trimethyl silane) amine] erbium and lutetium carbonate hydrate rare-earth metal organic compound and catalytic active core component precursors, including common transition metal organic compound dicyclopentadienyl titanium substituted salicylic acid compound and cupric glutamate and precious metal chemical complex hexa-nitroso rhodium trisodium and iridium tetrachloride in a hydrothermal reaction kettle under the effect of bisoctyl dimethyl ammonium bromide used as an emulsifier; drying and dewatering the reaction product; and burning in a muffle furnace under a certain temperature, thereby acquiring the solid catalyst for ozone heterogeneous oxidization.

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 organometallic compounds as catalyst precursors, common transition metal organic compounds and noble metal compounds as catalyst active center precursors, and multi-component porous supports are prepared by hydrothermal reaction and high-temperature calcination to prepare multi-metal-containing ozone heterogeneous oxidation 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

Images