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A monolithic catalyst, its preparation method, and its use

A monolithic catalyst and catalyst technology, applied in the direction of chemical instruments and methods, physical/chemical process catalysts, heterogeneous catalyst chemical elements, etc., can solve the problems of less catalyst research, difficult separation, solid-liquid separation, etc., and achieve good results Chemical and biological stability, long residence time, and efficiency-enhancing effect

Active Publication Date: 2019-07-23
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Research on heterogeneous CWPO catalysts is mostly focused on supported catalysts, which are generally in the form of powder, and solid-liquid separation is difficult, which increases the complexity of the process. There are few studies on monolithic catalysts.
For example, CN102039192A uses an epoxy resin-based porous polymer with an average particle size of 2mm to 5mm as a carrier to treat nitrophenol wastewater, which is difficult to separate.

Method used

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  • A monolithic catalyst, its preparation method, and its use
  • A monolithic catalyst, its preparation method, and its use
  • A monolithic catalyst, its preparation method, and its use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] (1) Cut the honeycomb cordierite into a cylindrical cordierite substrate with a diameter of 30mm and a height of 20mm, soak 16.1g of the substrate in 10wt% nitric acid solution, heat it in a constant temperature water bath at 80°C for 5h, and then wash it with deionized water Wash 4 times, then dry the cordierite in a 70°C drying oven for 4 hours, and finally place the cordierite in a muffle furnace, increase the temperature to 450°C at a rate of 5°C / min, keep the temperature for 5 hours, and then cool down to 80°C Then, it was taken out to obtain 15.5 g of acid-treated cordierite A1 carrier.

[0058] (2) At 20°C, the Ce(NO 3 ) 3 Put 1000 g of the solution into a beaker, place it on a magnetic stirrer, add 27 wt% ammonia water to adjust the pH to 9.0, make it completely precipitate, and filter out the precipitate with a suction filter. Rinse the precipitate several times with deionized water until the pH of the remaining water is 8. Take 100 g of the precipitate and ...

Embodiment 2

[0063] (1) At 25°C, prepare Ce(NO 3 ) 3 and Sr(NO 3 ) 2 Solution 1000g, wherein Ce(NO 3 ) 3 The mass percentage is 4wt%, Sr(NO 3 ) 2 The percentage content of the solution is 0.4wt%, put it into a beaker, place it on a magnetic stirrer, add 28wt% ammonia water to adjust the pH to 10.0, make it completely precipitate, and filter out the precipitate with a suction filter. Rinse the precipitate several times with deionized water until the pH of the remaining water is 6. Take 100 g of the precipitate and put it into a beaker, add 8 wt% dilute nitric acid at 50°C until the pH is 1, and stir for 2 hours to obtain yellow cerium-strontium sol B2, which is left to stand for 24 hours before use.

[0064] (2) At room temperature, impregnate 15.5g of cordierite A1 in 120g of cerium-strontium sol B2 that was evenly stirred, keep it for 4 minutes, blow off the excess liquid in the channel with a suction ear ball, and then place the cordierite in an oven at 95°C Dry for 35 minutes, r...

Embodiment 3

[0068](1) Cut the honeycomb cordierite into a cylindrical cordierite substrate with a diameter of 30mm and a height of 20mm, soak 16.2g of the substrate in 15wt% nitric acid solution, heat it in a constant temperature water bath at 60°C for 3h, and then wash it with deionized water 6 times, then dry the cordierite in a 90°C drying oven for 2 hours, and finally place the cordierite in a muffle furnace, increase the temperature to 500°C at a rate of 3°C / min, keep the temperature for 3 hours, and then cool down to below 80°C It was taken out to obtain 15.4 g of acid-treated cordierite A2 support.

[0069] (2) At room temperature, immerse 15.4g of cordierite A2 in 140g of cerium-strontium sol B2 that is evenly stirred, keep it for 6 minutes, blow off the excess liquid in the channel with a suction ear ball, and then place the cordierite in an oven at 100°C Dry for 30 minutes, repeat this operation 7 times, and finally place the cordierite in a muffle furnace, raise the temperature...

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Abstract

The invention discloses a monolithic catalyst, a preparation method thereof, and an application thereof. The active components of the catalyst include Fe 2 o 3 and Bi 2 o 3 , with acid-treated honeycomb cordierite as the substrate, CeO 2 As the second carrier, preferably SrO and CeO 2 composite oxides as the second carrier. The applicable conditions of the catalyst are mild, reducing the aggregation and loss of active components, and its vertical monazite channels can prevent uneven distribution of wastewater, significantly improve the mass transfer process, high catalytic activity and stability, and can be used in CWPO process to treat toxic and harmful , Refractory biodegradable nitrophenol wastewater.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to an integral catalyst for treating wastewater containing nitrophenol. Background technique [0002] With the development of world population, industrialization, agriculture and urbanization, the amount of wastewater produced by oil refineries, coke ovens, organic compound production plants, pulp and paper factories, drug synthesis factories, textile factories, etc. is increasing, and the main pollutant is chlorine Alkanes and phenolic compounds, and the traditional wastewater treatment methods are not ideal for the removal of such substances. [0003] At present, the methods for treating p-nitrophenol wastewater mainly include biochemical method, adsorption method, liquid membrane method and advanced oxidation technology. Although the biochemical method is more effective in treating low-concentration organic wastewater, and the cost is relatively low, it occupies a large area,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/843C02F1/72C02F101/38C02F101/34
CPCB01J23/002B01J23/8437B01J2523/00C02F1/725C02F2101/34C02F2101/38B01J2523/3712B01J2523/54B01J2523/842B01J2523/24
Inventor 衡华杨径靖周波刘俊陈良进常林张宏科华卫琦
Owner WANHUA CHEM GRP CO LTD
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