Method for preparing honeycomb ceramic catalyst for catalytically ozonizing organic matters in water

Abstract

The invention relates to a method for preparing honeycomb ceramic catalyst for multi-phase catalytic ozonization fixed bed reactors. Honeycomb ceramic is soaked in dilute hydrochloric acid solution, the honeycomb ceramic is then taken out and washed by deionized water, the honeycomb ceramic is immersed into alumina sol for 1 to 5 minutes, and is then taken out and dried under the room temperature, and the honeycomb ceramic is then dried under the temperature of 80 DEG C to 120 DEG C for 2 to 8 hours, and is calcined under the temperature of 400 DEG C to 600 DEG C for 2 to 6 hours, so that primary-coated honeycomb ceramic carrier is obtained. The coating steps are repeated, so that the content of alumina coating is 5 wt percent to 15 wt percent. The coated ceramic carrier is soaked in Co(NO3)2 solution for 0.5 to 2 hours, and is then taken out and dried under the temperature of 80 DEG C to 120 DEG C for 1 to 6 hours, the coated ceramic carrier is washed by deionized water, and is then dried again under the temperature of 80 DEG C to 120 DEG C for 1 to 6 hours, finally, the coated ceramic carrier is calcined under the temperature of 300 DEG C to 600 DEG C for 2 to 6 hours, and the loading of cobalt oxide in the obtained sample is 1 wt percent to 10 wt percent. Compared with ozonation, the catalyst shows high ozone catalytic activity, has excellent durability and catalytic stability, and can greatly increase the mineralization rate of 2,4-dichlorphenoxyacetic acid within the pH range between 4 and 9.

Description

technical field [0001] The invention relates to a method for developing a honeycomb ceramic catalyst used in a heterogeneous catalytic ozonation fixed-bed reactor, in particular to a preparation method of a honeycomb ceramic-supported cobalt oxide catalyst and research on catalytic ozonation. Background technique [0002] Ozone has been widely used in the field of water treatment in recent years due to its strong oxidizing and disinfection capabilities. But the solubility of ozone in water is low and easy to decompose, the utilization efficiency is low, and the operating cost is high, which limits its development to a certain extent. Although ozone can oxidize many refractory organic substances in water, the reaction selectivity with organic substances is poor, and it is not easy to completely decompose organic substances into CO 2 and H 2 O, its products are often small molecular carboxylic acid organic compounds that are difficult to mineralize, and the toxicity of inter...

AI Technical Summary

Problems solved by technology

These catalysts generally have a good catalytic effect under acidic conditions, but the phenomenon of metal dissolution is serious, and the effect is often not good under neutral conditions.

In addition, most of the above-mentioned catalysts are powders, and there is a problem of solid-liquid separation in actual operation, and it is difficult to recycle the catalysts.

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