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Low-temperature formaldehyde catalytic illumination sensitive material

A sensitive material, formaldehyde technology, applied in the field of sensing, can solve the problems affecting the sensitivity of the sensor and the difficulty of stable control

Inactive Publication Date: 2018-08-24
BEIJING UNION UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when using this sensitive material for miniaturization design, the stable control of high operating temperature becomes a problem, and the strong thermal radiation background signal noise (especially in the long wavelength region) caused by small fluctuations in high temperature seriously affects the sensitivity of the sensor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] (1) co-dissolve cobalt nitrate hexahydrate, titanium sulfate nonahydrate and aluminum nitrate nonahydrate in 10% hydrochloric acid aqueous solution, be warming up to 55 ℃, add citric acid under high-speed stirring state and make solution keep clear state, add dropwise 10 % ammonia water to make the solution pH value 5.6, cooled to room temperature and left to age for 5 hours, the solution was rotary evaporated at 80 ° C to obtain a gel, the gel was dried for 2 hours, fully ground, in a box-type resistance furnace at each Raise the temperature to 380°C at a rate of no more than 5°C per minute, keep this temperature for 5 hours, and cool naturally to obtain a mixed powder;

[0013] (2) Palladium dichloride is dissolved in the hydrochloric acid aqueous solution of 6% by mass fraction, under constant stirring, drip the hydrazine hydrate aqueous solution of 20% by mass fraction, be warming up to 50 ℃ of continuous stirring 4 hours, be cooled to room temperature and Add the a...

Embodiment 2

[0017] (1) Co-dissolve hydrated cobalt carbonate, titanyl sulfate and aluminum sulfate octadecahydrate in 14% hydrochloric acid aqueous solution, raise the temperature to 55°C, add citric acid under high-speed stirring and keep the solution clear, and add 9% Ammonia water makes the pH value of the solution 6.0, cool to room temperature and stand for 7 hours to age, the solution is rotary evaporated at 85°C to obtain a gel, the gel is dried for 2 hours, fully ground, and heated in a box-type resistance furnace at a rate of 1 minute Raise the temperature to 385°C at a speed not exceeding 5°C, keep this temperature for 5 hours, and cool naturally to obtain a mixed powder;

[0018] (2) Palladium dichloride is dissolved in the hydrochloric acid aqueous solution of 6% by mass fraction, under constant stirring, drip the hydrazine hydrate aqueous solution of 20% by mass fraction, be warming up to 50 ℃ of continuous stirring 4 hours, be cooled to room temperature and Add the above-ment...

Embodiment 3

[0022] (1) Co-dissolve cobalt sulfate hydrate, cobalt chloride hexahydrate, titanium trichloride and aluminum chloride hexahydrate in 12% hydrochloric acid aqueous solution, heat up to 55°C, add citric acid under high-speed stirring and keep the solution In a clear state, add 8% ammonia water dropwise to make the pH of the solution 5.8, cool to room temperature and let it stand for 6 hours to age, then rotatively evaporate the solution at 81°C to obtain a gel, dry the gel for 2 hours, fully grind it, and put it in the oven Heat up to 390°C at a rate of no more than 5°C per minute in a type resistance furnace, keep this temperature for 5 hours, and cool naturally to obtain a mixed powder;

[0023] (2) Palladium dichloride is dissolved in the hydrochloric acid aqueous solution of 6% by mass fraction, under constant stirring, drip the hydrazine hydrate aqueous solution of 20% by mass fraction, be warming up to 50 ℃ of continuous stirring 4 hours, be cooled to room temperature and ...

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Abstract

A low-temperature formaldehyde catalytic illumination sensitive material is a Pd-atom-doped composite powder composed of CoO, TiO2 and Al2O3. A preparation method includes the following steps: 1) co-dissolving cobalt salt, titanium salt and aluminum salt in a hydrochloric acid water solution and adding citric acid, dropwise adding ammonia water to regulate pH value, aging the mixture, performing spin-evaporation to prepare a gel, drying and grinding the gel, and roasting the gel in a chamber electric resistance furnace to obtain a powder mixture; 2) adding hydrazine hydrate to a PdCl2 solutionto reduce the PdCl2, adding the product to the powder mixture in the step 1), drying the mixture, performing two-stage calcination in a tubular furnace under vacuum, and naturally cooling the productto room temperature under protection of argon gas to obtain the Pd-atom-doped composite powder composed of CoO, TiO2 and Al2O3. The sensitive material can be used for producing a gas sensor, which can quickly test formaldehyde in air in trace amount at use temperature of not more than 200 DEG C without influence due to other common coexisting substances.

Description

technical field [0001] The invention relates to a low-temperature formaldehyde catalytic luminescence sensitive material, especially CoO and TiO doped with Pd atoms 2 and Al 2 o 3 A composite powder material composed of the invention belongs to the field of sensing technology. Background technique [0002] Formaldehyde is a colorless and volatile chemical raw material, which is widely used in products such as compressed boards, coatings, paints, cosmetics and packaging materials as adhesive raw materials, disinfectants, preservatives and finishing agents. People have different reactions to various concentrations of formaldehyde in the air. When the concentration of formaldehyde in the air reaches 0.06-0.07mg / m 3 Children will have mild asthma when it reaches 0.1mg / m 3 There will be peculiar smell and discomfort when it reaches 0.5mg / m 3 Sometimes it can irritate the eyes and cause tears, reaching 0.6mg / m 3 Can cause throat discomfort or pain, up to 1mg / m 3 When it wil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/10
CPCG01N31/10
Inventor 周考文魏建强
Owner BEIJING UNION UNIVERSITY
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