Preparation method for nano 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 reducing the loss of copper ions, reducing the cost of preparation, and no precious metal components

Active Publication Date: 2018-12-04
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 for nano wet oxidation catalyst
  • Preparation method for nano wet oxidation catalyst
  • Preparation method for nano wet oxidation catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Slurry 70g of activated alumina to form Al-containing 2 o 3 For a 300g / L slurry, add copper nitrate solution containing 15g 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 use deionized water to make the water-containing Add 3g of cerium nitrate solution as CeO to the slurry with a rate of 50%, and ultrasonically oscillate for 1.5h while stirring, and after direct drying, roast at 620°C for 2h; after roasting, mix the powder with 20g of manganese nitrate solution as MnO Make a slurry with a water content of 30%, add 1g of scallop powder after stirring, stir for 40min, seal and stand for 24h, extrude into a clover shape, apply 10g of nano-sized cerium oxide after drying, and bake at 650°C for 7h to obtain wet oxidation Catalyst Sample A.

Embodiment 2

[0037] 30g of activated alumina pellets were beaten to form Al-containing 2 o 3 To make a 100g / L slurry, add copper nitrate solution containing 8g as CuO, ultrasonically oscillate for 3 hours, then gradually add ammonia water to adjust the pH value to 9.0, after the precipitation is complete, filter and wash; then use deionized water to make the washed material Add 2 g of cerium nitrate solution as CeO to the slurry with a rate of 50%, ultrasonically oscillate for 1.5 h while stirring, and after direct drying, roast at 500°C for 7 h; after roasting, mix the powder with 10 g of manganese nitrate solution as MnO Make a slurry with a water content of 40%, add 1g of scallop powder after stirring, stir for 40min, seal and let stand for 20h, extrude into a clover shape, apply 3g of nano-sized cerium oxide after drying, and bake at 550°C for 2h to obtain wet oxidation Catalyst Sample B.

Embodiment 3

[0041] 40g of activated alumina pellets were beaten to form Al-containing 2 o 3 For 100g / L slurry, add copper nitrate solution containing 15g as CuO, ultrasonically oscillate for 3 hours, then gradually add ammonia water to adjust the pH value to 9.0, after the precipitation is complete, filter and wash; then use deionized water to make the washed material Add 3 g of cerium nitrate solution as CeO to the slurry with a rate of 50%, ultrasonically oscillate for 1.5 h while stirring, and after direct drying, roast at 550 ° C for 7 h; after roasting, mix the powder with 15 g of manganese nitrate solution as MnO Make a slurry with a water content of 40%, add 1g of scallop powder after stirring, stir for 40min, seal and stand for 20h, extrude into a clover shape, apply 6g of nano-sized cerium oxide after drying, and bake at 550°C for 2h to obtain wet oxidation Catalyst Sample C.

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Abstract

The invention discloses a preparation method for a nano wet oxidation catalyst. The preparation method includes the following steps: (1) pulping activated alumina; (2) dissolving a copper source precursor into a solution; (3) uniformly mixing the materials of the step (1) and (2); (4) adjusting a pH value of the material formed by the step (3) to alkaline, and performing deposition, filtering, drying and roasting so that a powder material can be formed; and (5) mixing a solution formed by a manganese source precursor and the powder material of the step (4) into slurry, adding a pore forming agent after stirring, performing secondary stirring, extruding the slurry into a clover shape after performing seal standing, coating nanoscale cerium oxide after drying, and obtaining the wet oxidationcatalyst after roasting. The prepared wet oxidation catalyst can be used for waste alkali liquor, and has characteristics of stable performance and high catalytic efficiency.

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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IPC IPC(8): B01J23/889B01J35/10C02F1/72C02F1/74C02F101/10C02F101/34C02F103/36
CPCC02F1/725C02F1/727C02F1/74B01J23/002B01J23/8892C02F2103/36C02F2101/345C02F2101/101B01J2523/00B01J35/613B01J35/633B01J35/635B01J35/615B01J2523/31B01J2523/17B01J2523/3712B01J2523/72
Inventor 杨岳梁宝锋笪敏峰荣树茂李杨张媛何琳巫树锋王立蓉贾媛媛
Owner PETROCHINA CO LTD
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