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Method for preparing NiO fiber material for NOX detection

A fiber material and nanofiber technology, applied in the field of sensors, can solve the problems of difficult to meet the commercialization needs of NOX sensors, easy poisoning, weak signal, etc., and achieve high practical value, large specific surface area, and low material cost.

Inactive Publication Date: 2015-04-22
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The search found many related patents for NOX sensor catalysts, and some patents also mentioned the shortcomings and improvement methods of noble metal catalysts, but there is no patent application with the same claims as this patent, for example, the patent application number is 97117135.1 'Nitrogen The catalyst material used in the oxide sensor' is perovskite-type and spinel-type composite oxide containing manganese as a constituent element; the catalyst material used in the "electrochemical sensor" with patent application number 02815829.6 is iridium, platinum and other precious metal materials; the patent application number is CN200480023636.2, the catalyst material used in the 'electrochemical sensor' is rhenium, iridium, ruthenium, rhodium, platinum and palladium and their alloy metal materials; the patent application number is CN200680040185.2' nitrogen Oxide gas sensor and method' using catalyst material is a catalyst selected from gold, nickel or rhodium
[0007] In summary, traditional noble metal catalysts and emerging non-precious metal catalysts are either high in cost, prone to poisoning, or low in activity and weak in signal, which are obviously difficult to meet the commercialization needs of NOX sensors.

Method used

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  • Method for preparing NiO fiber material for NOX detection
  • Method for preparing NiO fiber material for NOX detection
  • Method for preparing NiO fiber material for NOX detection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Such as Figure 1-3 As shown, weigh 1 g of nickel acetate and place it in a beaker, add 100 g of absolute ethanol, stir at room temperature to dissolve it, and stir for 2 hours; then add 5 g of PVP, and continue stirring for 12 hours to obtain a precursor solution. Put the precursor solution in the electrospinning equipment, apply a high voltage of 15kV to the end of the capillary containing the solution, use aluminum foil as a receiving plate, apply a high voltage of -1kV to the aluminum foil, adjust the receiving distance to 15cm, start spinning, and obtain PVP after 5 hours Composite nanofiber membrane. Remove the film, place it in a high-temperature sintering furnace, raise the temperature to 200°C at a heating rate of 2°C / min, keep the temperature constant for 2 hours, then raise the temperature to 500°C at a heating rate of 10°C / min, keep the temperature at a constant temperature for 4 hours, and then cool to room temperature with the furnace . Obtain NiO nanofi...

Embodiment 2

[0029] Weigh 5g of nickel acetate and place it in a beaker, add 100g of absolute ethanol, stir to dissolve at room temperature for 4h; then add 10g of PVP, continue stirring for 10h to obtain a precursor solution. Put the precursor solution in the electrospinning equipment, apply a high voltage of 20kV to the end of the capillary containing the solution, use aluminum foil as a receiving plate, apply a high voltage of -1kV to the aluminum foil, adjust the receiving distance to 20cm, start spinning, and obtain a composite after 4 hours nanofibrous membrane. Remove the film, place it in a high-temperature sintering furnace, raise the temperature to 300°C at a heating rate of 5°C / min, keep the temperature constant for 2 hours, then raise the temperature to 600°C at a heating rate of 15°C / min, keep the temperature at a constant temperature for 3 hours, and then cool to room temperature with the furnace . Obtain NiO nanofiber material.

Embodiment 3

[0031] Weigh 8g of nickel acetate and place it in a beaker, add 100g of absolute ethanol, stir to dissolve at room temperature for 3h; then add 15g of PVP, continue stirring for 15h to obtain a precursor solution. Put the precursor solution in the electrospinning equipment, apply a high voltage of 20kV to the end of the capillary containing the solution, use aluminum foil as a receiving plate, apply a high voltage of -1kV to the aluminum foil, adjust the receiving distance to 30cm, start spinning, and obtain a composite after 6 hours nanofibrous membrane. Remove the film, place it in a high-temperature sintering furnace, raise the temperature to 400°C at a heating rate of 7°C / min, keep the temperature constant for 2 hours, then raise the temperature to 800°C at a heating rate of 20°C / min, keep the temperature at a constant temperature for 4 hours, and then cool to room temperature with the furnace . Obtain NiO nanofiber material.

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Abstract

The invention relates to a method for preparing a NiO fiber material for NOX detection. The material is characterized by being prepared from NiO with the nano fiber morphology. The method specifically comprises the following steps: dissolving soluble nickel salt in a proper amount of solvent, stirring to dissolve the nickel salt at the room temperature, adding PVP into a solution, thereby obtaining a precursor solution; putting the precursor solution into electrostatic spinning equipment, performing electrostatic spinning, calcining PVP composite nano fiber, and naturally cooling to be the room temperature, thereby obtaining the NiO nano fiber material after calcining. The material is low in cost and easy in preparation and has good response property to NOX gas concentration change.

Description

technical field [0001] The invention relates to a preparation method of a NiO fiber material that can be used for NOX detection, which can be applied to devices such as sensors for detecting NOX content in gases, and can be used for exhaust gas containing nitrogen oxides such as automobile exhaust gas, smelter exhaust gas, and various brick kiln exhaust gases. The post-processing of is of great significance and belongs to the field of sensors. Background technique [0002] At present, the world is facing comprehensive challenges of energy and environment. A number of studies have shown that: urban motor vehicle exhaust pollution has risen to become the main air pollution, therefore, research on traditional vehicle emission control technology has increasingly become the focus of attention. Nitrogen oxide NOX can be said to be one of the most harmful components in automobile exhaust, which seriously threatens people's health. In the National IV and National V, there are stric...

Claims

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Application Information

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IPC IPC(8): D01F9/08D01D5/00G01N27/406
Inventor 许德超王金兴张斌张克金王丹魏传盟
Owner CHINA FIRST AUTOMOBILE
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