Method for preparing honeycomb ceramic catalyst for catalytically ozonizing organic matters in water
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A honeycomb ceramic, ozonated water technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve solid-liquid separation, catalyst recycling difficulties, metal Dissolution is serious and other problems
Active Publication Date: 2010-08-25
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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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 con...
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specific Embodiment approach 1
[0014] Specific implementation mode one: preparation of honeycomb ceramic catalyst
[0015] Soak the honeycomb ceramics in dilute hydrochloric acid solution, take it out and wash it with deionized water, then immerse it in the aluminum sol prepared from pseudo-boehmite for 2 minutes, blow off the excess sol in the pores after taking it out, dry at room temperature for 12 hours, and dry at 110°C 4 hours, and then calcined at 500° C. for 3 hours to obtain a once-coated honeycomb ceramic carrier. Repeat the above steps twice to obtain a three-time coated honeycomb ceramic carrier. Co(NO 3 ) 2 solution, soak the coated ceramic support in Co(NO 3 ) 2 Take it out after 1 hour in the solution, blow out the excess solution in the carrier channel, dry at 110°C for 3 hours, wash with deionized water, dry at 110°C for 3 hours, and calcined at 450°C for 3 hours.
[0016] After three coatings, the content of the alumina coating was 13.5wt%. The coated honeycomb ceramics were placed in...
specific Embodiment approach 2
[0019] Specific embodiment two: Catalytic ozone oxidation activity of honeycomb ceramic catalyst
[0020] In a 6L columnar bubbling semi-continuous reactor, 2,4-dichlorophenoxyacetic acid was used as the target pollutant to evaluate the catalytic ozonation activity of the honeycomb ceramic catalyst of the present invention. The reaction temperature is 25° C., pH=4-9, the gas flow rate of the ozone-oxygen mixed gas is 0.5 L / min, and the ozone concentration in the gas is 30 mg / L.
[0021] figure 1 The curves of TOC change with time for the degradation of organic pollutants by catalytic ozonation oxidation of honeycomb ceramic materials under different pH conditions are given. It can be seen from the figure that at pH=7, the removal effect of ozone oxidation alone on 2,4-dichlorophenoxyacetic acid is not obvious (the removal rate of TOC within 30 minutes is only 10.5%), and the removal of TOC after adding honeycomb ceramic catalyst The rate has reached about 63%, which is 53% h...
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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...
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IPC IPC(8): B01J23/75B01J35/04C02F1/78A62D3/38
Inventor 胡春邢胜涛
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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