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Ternary catalyst and preparation method and application thereof

A three-way catalyst and compound technology, which is applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of low catalytic effect of three-way catalysts and complicated preparation methods of three-way catalysts. The effect of improving the oxygen effluent effect, strengthening the loading effect, and improving the degradation ability

Pending Publication Date: 2019-04-19
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention provides a method for preparing a three-way catalyst, which solves the problems that the existing three-way catalyst preparation method is complex and the prepared three-way catalyst has a low catalytic effect

Method used

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  • Ternary catalyst and preparation method and application thereof
  • Ternary catalyst and preparation method and application thereof
  • Ternary catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] This embodiment is the preparation of three-way catalyst.

[0040] Specific steps are as follows:

[0041] (1) Carrier selection: select γ-Al with a particle size of 2-3mm 2 o 3 Pellets as catalyst support, γ-Al 2 o 3 The pellets were purchased from Jiangsu Sanji Industrial Co., Ltd.

[0042] (2) Carrier activation: γ-Al 2 o 3 The pellets were washed with deionized water, and then dried in an oven at 65°C.

[0043] (3) Catalyst preparation: prepare three-way catalyst by impregnation roasting method, comprise the following steps:

[0044] 1) Precursor impregnating solution configuration: take 1% manganese nitrate aqueous solution, 1% ferric nitrate aqueous solution and 1.5% cerium nitrate aqueous solution, dissolve them in distilled water, stir well, and form a precursor after settling to 100mL body immersion solution;

[0045] 2) Impregnation: 20g γ-Al 2 o 3 The balls were immersed in the precursor impregnation solution, and were subjected to vibration impregna...

Embodiment 2

[0052] This embodiment uses the three-way catalyst of embodiment 1, the binary catalyst of comparative example 1, gamma-Al 2 o 3 The pellets were used to treat dairy cow breeding wastewater, and ozone was only used as a blank control.

[0053] Adjust the pH to 9, take four groups of 4L dairy cow breeding waste water of primary aerobic effluent, the water samples are taken from Guangzhou Huamei Milk Company (Qinglong Base), add 20g of three-way catalyst, two-way catalyst, γ- Al 2 o 3 Small balls, and then the four groups were respectively fed with ozone, and the dosage of ozone was 11.25mg·L -1 min -1 , The reaction time is 20min.

Embodiment 3

[0055] In this embodiment, samples were taken when the reaction time of Example 2 was 0min, 5min, 10min, 15min, and 20min, and the COD of the wastewater was measured by the ultraviolet spectrophotometer method, the COD removal rate of the wastewater was calculated, and the chroma of the wastewater was measured by the dilution factor method. Measurement results such as figure 1 , figure 2 shown.

[0056] Depend on figure 1 It can be seen that when dealing with the actual dairy wastewater, because it is a complex system and contains more refractory biodegradable organic matter, the effect is significantly different from that of a single system. However, compared with the single ozone experiment and the single carrier catalytic ozonation experiment, the metal-loaded catalyst showed a significant COD removal rate, and the COD removal rate of the loaded three-way catalyst was better than that of the binary catalyst, with a removal rate of 45%. Such as image 3 As shown, the CO...

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Abstract

The invention relates to the technical field of catalysts, in particular to a ternary catalyst and a preparation method and application thereof. The preparation method of the ternary catalyst comprises the following steps of: step 1, mixing aqueous solution containing a manganese compound, aqueous solution containing an iron compound and aqueous solution containing a cerium compound to obtain precursor solution; step 2, soaking a modified gamma-Al2O3 pellet in precursor solution, and respectively drying and roasting to obtain the ternary catalyst. The preparation method adopts an immersion roasting method, which is simple to operate, and can ensure that three metal oxides of manganese, iron and cerium can be stably attached to the surface of the gamma-Al2O3 pellet and the prepared ternarycatalyst is high in catalytic activity, and problems that the existing preparation method of the ternary catalyst is complex and the catalytic effect of the prepared ternary catalyst is low are solved.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a three-way catalyst and its preparation method and application. Background technique [0002] Three-way catalysts are generally composed of catalyst carriers and active components. At present, three-way catalysts are widely used in the treatment of automobile exhaust and exhaust systems, but their preparation methods are complicated, and the catalytic efficiency of the prepared three-way catalysts is low. Contents of the invention [0003] The invention provides a preparation method of a three-way catalyst, which solves the problems that the existing three-way catalyst preparation method is complicated and the prepared three-way catalyst has low catalytic effect. [0004] Its specific technical scheme is as follows: [0005] The invention provides a kind of preparation method of three-way catalyst, comprises the following steps: [0006] Step 1: mixing an aqueous solution ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J37/08B01J37/02C02F1/78C02F103/20
CPCB01J23/8892B01J37/0201B01J37/082C02F1/725C02F1/78C02F2103/20C02F2305/023
Inventor 宋卫锋李家耀李秋华余泽峰
Owner GUANGDONG UNIV OF TECH
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