Ozone heterogeneous oxidation solid catalyst preparation method

Abstract

The invention belongs to the technical field of environment protection and chemical catalysts and relates to an ozone heterogeneous oxidation solid catalyst preparation method. The preparation method includes: taking porous mineral materials including gamma-aluminum oxide, barite, talc, trona, aluminum hydroxide and celestite as carriers; subjecting the carriers to lithium hypochlorite and bis(acetylacetone)beryllium broaching modification; adding surfactant dioctadecyldimethyl ammonium chloride for surface activation under the action of ultrasonic waves; subjecting the carriers to hydrothermal reaction, with a complex mineralizer composed of borax and potassium sulfate, catalytic activity auxiliary agent precursors including tetra(2,2,6,6-tetramethyl-3,5-hydrochelidonic acid)cerium (IV), samarium acetylacetonate, tri(2,2,6,6-tetradimethyl-3,5-hydrochelidonic acid)gadolinium (III) and holmium oxalate decahydrate and catalytic activity central precursors including lysine manganese, L-aspartic acid molybdenum, trisodium rhodium hexanitrite and dipotassium hexachloroosmium, in a hydrothermal reactor under the action of m-nitrobenzyl dimethyl ammonium bromide serving as an emulsifying agent; drying to remove moisture, and firing in a muffle furnace at a certain temperature to obtain an ozone heterogeneous oxidation solid catalyst.

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...

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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