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Nano combustion catalyst and preparation method thereof

A combustion catalyst, nanotechnology, applied in catalyst activation/preparation, chemical instruments and methods, chemical elements of heterogeneous catalysts, etc. It is beneficial to large-scale production, high catalytic combustion efficiency, and simple preparation method.

Inactive Publication Date: 2018-07-24
天津爱蓝天环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the working requirements of the three-way catalyst are very strict. If it is not used properly, it will cause other defects such as catalyst failure:
[0003] 1. The temperature is too high: When the engine ignition system fails, the unburned fuel enters the exhaust system and is ignited again when it encounters high temperature on the surface of the catalyst, causing the temperature of the three-way catalyst to be too high and the active components of the catalyst to sinter and fail
[0004] 2. Chronic poisoning: The three-way catalyst is very sensitive to elements such as sulfur, lead, phosphorus, and zinc. Sulfur and lead come from gasoline, and phosphorus and zinc come from lubricating oil. These four substances and their combustion form oxides in the engine Particles are easily adsorbed on the surface of the catalyst, so that the catalyst cannot contact with the exhaust gas, thus losing its catalytic effect, which is the so-called "poisoning" phenomenon
[0005] 3. Surface area carbon: When the car works at low temperature for a long time, the three-way catalytic converter cannot be started, and the carbon smoke emitted by the engine will adhere to the surface of the catalyst, making it impossible to contact with CO and HC. After a long time, the pores of the carrier will be blocked. , affecting its transformation efficiency
[0006] 4. Exhaust deterioration: The catalytic converter has a certain limit on the conversion ability of pollutants, so the original exhaust must be reduced to a minimum through in-machine purification technology
If the concentration and total amount of each component of the exhaust gas pollutants are too large, such as the mixture gas is too thick, etc., it will affect the catalytic conversion ability of the catalyst and reduce its conversion efficiency
In addition, since a large amount of HC and CO in the exhaust gas enter the catalytic reactor, excessive oxidation reaction will occur in it, and a large amount of heat generated by the oxidation reaction will cause the catalytic reactor temperature to be too high and be damaged
[0007] At present, the problem of vehicle exhaust exceeding the standard needs to be solved urgently, but people have not yet found an optimal product for treating vehicles with exhaust emission problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The raw materials for preparation include 45% of aluminum oxide, 30% of silicon dioxide, 5% of nanometer cerium oxide, 15% of nanometer iron oxide and 5% of nanometer manganese oxide.

[0028] Preparation:

[0029] a) Mixing 45% aluminum oxide, 30% silicon dioxide, 5% nano-cerium oxide, 15% nano-iron oxide and 5% manganese oxide with water according to weight percentage to obtain raw materials for preparation;

[0030] b), the prepared raw materials were put into a ball mill for ball milling, and the ball milling was carried out for 5 hours;

[0031] c), the prepared raw material after ball milling is prepared into a spherical shape through a molding process, with a diameter between 5-10mm;

[0032] d), after being put into a roasting furnace for roasting, take it out and cool to room temperature.

[0033] The calcination temperature is 300° C., and the calcination time is 1 hour under the air atmosphere, and the finally formed oxide is a nano-combustion catalyst.

Embodiment 2

[0035] The raw materials for preparation include 50% aluminum oxide, 23% silicon dioxide, 3% nano cerium oxide, 17% nano iron oxide and 7% nano manganese oxide.

[0036] Preparation:

[0037] a) mixing 50% aluminum oxide, 23% silicon dioxide, 3% nano-cerium oxide, 17% nano-iron oxide and 7% nano-manganese oxide with water according to weight percentage to obtain raw materials for preparation;

[0038] b), the prepared raw materials are put into a ball mill for ball milling, and the ball milling is for 10 hours;

[0039] c), the prepared raw material after ball milling is prepared into a spherical shape through a molding process, with a diameter between 5-10mm;

[0040] d), after being put into a roasting furnace for roasting, take it out and cool to room temperature.

[0041] The calcination temperature is 280° C., the calcination time is 2 hours under air atmosphere, and the finally formed oxide is a nano-combustion catalyst.

Embodiment 3

[0043] The raw materials for preparation include 40% of aluminum oxide, 30% of silicon dioxide, 1% of nanometer cerium oxide, 25% of nanometer iron oxide and 4% of nanometer manganese oxide.

[0044] Preparation:

[0045] a) Mixing 40% alumina, 30% silicon dioxide, 1% nano-cerium oxide, 25% nano-iron oxide and 4% nano-manganese oxide with water according to weight percentage to obtain raw materials for preparation;

[0046] b), the prepared raw materials were put into a ball mill for ball milling, and the ball milling was carried out for 3 hours;

[0047] c), preparing the raw material after ball milling into a cylinder through a molding process, with a diameter of 3-5mm and a length of 5-10mm;

[0048] d), after being put into a roasting furnace for roasting, take it out and cool to room temperature.

[0049] The calcination temperature is 250° C., the calcination time is 0.5 hour under air atmosphere, and the finally formed oxide is a nano-combustion catalyst.

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Abstract

The invention provides a nano combustion catalyst. The nano combustion catalyst is prepared from the following raw materials: aluminium oxide, silicon dioxide, cerium oxide, ferric oxide and manganeseoxide with the weight ratio being (40-60):(20-30):(1-5):(10-30):(5-10), wherein cerium oxide is nano cerium oxide, ferric oxide is nano ferric oxide, and manganese oxide is nano manganese oxide. Theinvention also provides a preparation method of the nano combustion catalyst. The preparation method comprises the following steps of: weighing aluminium oxide, silicon dioxide, cerium oxide, ferric oxide and manganese oxide according the weight percent, and mixing with water to obtain preparation raw materials; placing the preparation raw materials into a ball mill for ball milling; adopting a forming process to prepare the ball-milled preparation raw materials into spheres or cylinders; placing in a roasting furnace for roasting, then taking out, and cooling to room temperature. The nano combustion catalyst provided by the invention has the beneficial effects that the problem of exceeding-standard tail-gas emission caused by failure of the three-way catalyst due to poisoning and ageing can be solved, and the activity and the efficiency are high.

Description

technical field [0001] The invention relates to a combustion catalyst, in particular to a nanometer combustion catalyst and a preparation method thereof. Background technique [0002] In recent years, people have paid more and more attention to air quality, and the air pollution caused by motor vehicle exhaust has received widespread attention. The use of motor vehicle exhaust purification catalysts (three-way catalysts) can effectively eliminate harmful substances such as hydrocarbons (HC), nitrogen oxides (NOx) and carbon monoxide (CO) in automobile exhaust. However, the working requirements of the three-way catalyst are very strict. If it is not used properly, it will cause other defects such as catalyst failure: [0003] 1. The temperature is too high: When the ignition system of the engine fails, the unburned fuel enters the exhaust system and is ignited again when it encounters high temperature on the surface of the catalyst, causing the temperature of the three-way c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J37/00B01J37/08
CPCB01J23/002B01J23/8892B01J37/0036B01J37/08B01J2523/00B01J2523/31B01J2523/3712B01J2523/41B01J2523/72B01J2523/842
Inventor 张东白金昕杨学才
Owner 天津爱蓝天环保科技有限公司
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