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Preparation method for high specific surface area wet oxidation catalyst

A high specific surface area, wet oxidation technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problem of low COD removal efficiency, affecting catalyst performance and activity To reduce the loss of copper ions, improve the strength and reduce the loss of copper

Active Publication Date: 2018-12-04
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In summary, the wet oxidation catalysts are prepared by one-time precipitation and one-time roasting, and have a certain removal effect on COD and organic matter in wastewater during the catalytic wet oxidation process. During the treatment process, the catalyst is easily poisoned, the COD removal efficiency is low, and the active component copper is easy to lose, which affects the performance of the catalyst

Method used

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  • Preparation method for high specific surface area wet oxidation catalyst
  • Preparation method for high specific surface area wet oxidation catalyst
  • Preparation method for high specific surface area wet oxidation catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 30g of activated carbon was impregnated with 5% glucose and beaten to form a slurry with a carbon content of 100g / L, adding copper nitrate solution containing 30g of CuO, ultrasonically oscillating for 2 hours, then gradually adding ammonia water to adjust the pH value to 8.0, after precipitation, filter, Washing; then use deionized water to make a slurry with a water content of 50%, add 10g of nickel nitrate solution in terms of NiO, stir while ultrasonically oscillating for 1.5h, and dry directly at 600°C in an inert gas environment Roasting for 2 hours; after roasting, the powder is then mixed with 10g of CeO cerium nitrate solution to make a slurry with a water content of 30%, after stirring, add 1g of urea, stir for 40min, seal and stand for 24h, dry, and in an inert gas environment at 650°C Wet oxidation catalyst sample A was obtained after calcination for 7 hours.

Embodiment 2

[0037] Impregnate 20g of activated carbon with 12% glucose and beat to form a slurry with a carbon content of 200g / L, add copper nitrate solution containing 30g of CuO, and gradually add ammonia water to adjust the pH value to 9.0 after ultrasonic vibration for 1 hour. After the precipitation is complete, filter , washing; then the washed material is made into a slurry with a water content of 50% with deionized water, and 20 g of nickel nitrate solution in terms of NiO is added, and ultrasonic vibration is performed for 1.5 h while stirring. Roast at ℃ for 2h; after roasting, the powder is mixed with 5g of CeO cerium nitrate solution to make a slurry with a water content of 30%, after stirring, add 1g of Tianqing powder, stir for 40min, seal and stand for 24h, dry, and inert gas environment Wet oxidation catalyst sample B was obtained after calcination at 600°C for 5 hours.

Embodiment 3

[0041] Impregnate 40g of activated carbon with 10% glucose and beat to form a slurry with a carbon content of 300g / L, add copper nitrate solution containing 30g of CuO, and gradually add ammonia water to adjust the pH value to 10.0 after ultrasonic oscillation for 2 hours. After the precipitation is complete, filter , washing; then the washed material is made into a slurry with a water content of 50% with deionized water, and 20g of nickel nitrate solution in terms of NiO is added, and ultrasonic vibration is performed for 1.5h while stirring. Roast at ℃ for 2h; after roasting, the powder is mixed with 10g of cerium nitrate solution calculated as CeO to make a slurry with a water content of 30%, after stirring, add 1g of Tianqing powder, stir for 40min, seal and stand for 24h, dry, and inert gas environment Wet oxidation catalyst sample C was obtained after calcination at 550°C for 3 hours.

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Abstract

The invention discloses a preparation method for a high specific surface area wet oxidation catalyst. The preparation method includes the following steps: (1) processing active carbon by adopting carbohydrate, and performing pulping; (2) dissolving a copper source precursor into a solution; (3) mixing materials of (1) and (2), adjusting pH values to form deposition, and performing filtering and washing; (4) dissolving a nickel source precursor into a solution, fulling mixing with (3), performing drying, baking the mixture in an inert gas environment to form a powdered material; and (5) mixingthe powdered material of the step (4) with a cerium source precursor into slurry, adding a pore forming agent after stirring, performing seal standing and drying after secondary stirring, baking the mixture in the inert gas environment to form a wet oxidation catalyst. The prepared wet oxidation catalyst can be used for oil refining or ethylene waste lye treatment, and has large specific surface areas and high catalytic activity.

Description

technical field [0001] The invention relates to a preparation method of a composite metal oxide catalyst, in particular to a preparation method for a wet oxidation catalyst. Background technique [0002] Wet (air) oxidation (wet air oxidation, WAO) treatment of high-concentration refractory organic wastewater usually requires higher temperature and pressure (200-3l5°C, 2-21MPa) and longer residence time, and its reaction conditions are very harsh . Catalytic wet oxidation (CWAO) can reduce the reaction temperature and pressure while maintaining the treatment effect, which greatly promotes the development and application of wet oxidation. Therefore, the development of catalysts with high activity and stability and suitable for CWAO has become the focus and difficulty of current research. In addition to different concentrations of free alkali (NaOH) in oil refining or ethylene waste lye (alkali slag), it also contains a large amount of high-concentration Na 2 S. Organic aci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83C02F1/74C02F101/34C02F101/30
CPCC02F1/725C02F1/74B01J23/83B01J37/084C02F2101/34C02F2101/40C02F2101/345C02F2101/30B01J35/633B01J35/635B01J35/615
Inventor 杨岳李杨荣树茂巫树锋贾媛媛笪敏峰江岩李常青周霞王军
Owner PETROCHINA CO LTD
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