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Preparation method of copper-based wet oxidation catalyst

A wet oxidation and catalyst technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve low COD removal efficiency, loss of active component copper, impact on Catalyst performance and other issues to achieve the effect of enriching pore size distribution, reducing copper loss, and low cost

Active Publication Date: 2021-04-30
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 of copper-based wet oxidation catalyst
  • Preparation method of copper-based wet oxidation catalyst
  • Preparation method of copper-based wet oxidation catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] will contain Al 2 o 3 A total of 70g of aluminum chloride is dissolved to form a 2 o 3 It is a 35g / L mixed solution, add copper nitrate solution containing 5g as CuO, ultrasonically oscillate for 2 hours, then gradually add ammonia water to adjust the pH value to 9, after the precipitation is complete, filter and wash; and then make the washed material with deionized water Add 7 g of cerium nitrate solution as CeO to the slurry with a water content of 50%, and ultrasonically oscillate for 1.5 h while stirring. After direct drying, roast at 550 ° C for 2 h; after roasting, the powder is mixed with Fe 2 o 3 The ferric nitrate solution of 10g is made into a slurry with a water content of 30%, and after stirring, 1g of citric acid is added to form a SiO 2 Wet oxidation catalyst 1 was obtained by adding 2.4 g of silica sol, stirring for 40 min, sealing and standing for 24 h, drying, and calcination at 650° C. for 7 h.

Embodiment 2

[0031] will contain Al 2 o 3 A total of 70g of aluminum chloride is dissolved to form a 2 o3 It is a 35g / L mixed solution, add copper nitrate solution containing 2g as CuO, ultrasonically oscillate for 2 hours, then gradually add ammonia water to adjust the pH value to 8.5, after the precipitation is complete, filter and wash; then make the washed material with deionized water Add 10g of cerium nitrate solution calculated as CeO to the slurry with a water content of 50%, and ultrasonically oscillate for 1.5h while stirring. After direct drying, roast at 600°C for 3h; after roasting, the powder is mixed with Fe 2 o 3 The ferric nitrate solution of 5g is made into a slurry with a water content of 30%, and after stirring, 1g of citric acid is added to form a SiO 2 A total of 3 g of silica sol was stirred for 40 minutes, sealed and left standing for 30 hours, dried, and calcined at 600° C. for 5 hours to obtain wet oxidation catalyst 2 .

Embodiment 3

[0033] will contain Al 2 o 3 A total of 70g of aluminum chloride is dissolved to form a 2 o 3 It is a 30g / L mixed solution, add copper nitrate solution containing 7g as CuO, mechanically stir for 2 hours, then gradually add ammonia water to adjust the pH value to 9.0, after the precipitation is complete, filter and wash; and then make the washed material with deionized water Add 5 g of cerium nitrate solution as CeO to the slurry with a moisture content of 50%, and ultrasonically oscillate for 3 hours while stirring, and after direct drying, roast at 550°C for 5 hours; Make a slurry with a water content of 30%, add 1.5g citric acid after stirring, and use SiO 2 Wet oxidation catalyst 3 was obtained by adding 3.5 g of silica sol, stirring for 60 min, sealing and standing for 10 h, drying, and calcination at 600° C. for 6 h.

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Abstract

The invention discloses a copper-based wet oxidation catalyst and a preparation method thereof, comprising (1) dissolving an aluminum source precursor to form a solution; (2) dissolving a copper source precursor to form a solution, and combining (1) and (2) Mix; (3) After mixing the solution obtained in step (2) evenly, adjust the pH value to form a precipitate, filter, and wash; (4) add deionized water to the filter cake obtained in step (3), adjust it into a slurry, and add cerium source precursor solution, after uniform mixing, directly dry and roast to form a powder; (5) mix the powder in step (4) with the iron source precursor solution into a slurry, after stirring, add silica sol, The pore-forming agent, after the secondary stirring, is sealed and left still, dried and roasted to form a wet oxidation catalyst. The wet oxidation catalyst prepared by the invention is used for high-concentration organic wastewater, and has the characteristics of low cost, stable performance and the like.

Description

technical field [0001] The invention relates to a method for preparing a composite metal oxide catalyst, in particular to a method for preparing a copper-based catalyst for wet oxidation. 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/83C02F1/72C02F1/74C02F101/34C02F101/30
CPCB01J23/002B01J23/83B01J35/1019B01J35/1038B01J2523/00C02F1/725C02F1/727C02F1/74C02F2101/345C02F2101/40B01J2523/17B01J2523/31B01J2523/3712B01J2523/41B01J2523/842
Inventor 李杨朱夔杨岳荣树茂刘光利梁宝锋巫树锋何琳张媛贾媛媛
Owner PETROCHINA CO LTD