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Low-temperature catalytic luminescence sensitive material for benzene

A technology of low-temperature catalysis and sensitive materials, applied in the field of sensing, can solve the problems of insufficient stability and sensitivity, time-consuming, difficult on-site realization, and difficult stability control.

Inactive Publication Date: 2018-11-13
BEIJING UNION UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since these methods require pre-concentration, desorption and proper treatment to complete the determination through analytical instruments, they are time-consuming and difficult to implement on-site
The on-site determination method of benzene mainly includes detection tube colorimetry, which has insufficient stability and sensitivity, and cannot complete the accurate determination of trace amounts of benzene
In 2006, our research group published a research paper entitled "Determination of Benzene Series in Air by Catalytic Luminescence Method of Nanocomposite Materials" in the analytical laboratory. We found that copper manganese ferrocomposite nanomaterials have high catalytic luminescence for benzene However, the service temperature of this sensitive material is 320°C. When using this sensitive material for miniaturization design, the stable control of the higher service temperature becomes a problem, and the strong thermal radiation background signal noise caused by high temperature fluctuations (especially is the long wavelength region) seriously affects the sensitivity of the sensor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Dissolve ammonium tungstate in 14% hydrochloric acid aqueous solution to form solution A, dissolve aluminum nitrate nonahydrate in 16% citric acid aqueous solution to form solution B, and slowly add solution B dropwise under continuous stirring Add agar powder to solution A, heat up to 95°C and stir continuously until the solution is clear, add ammonium molybdate crystals directly into this solution and stir until completely dissolved, then add glucose and chloroplatinic acid, and reflux at 105°C for 4 hours , cooled to room temperature to form a gel, after drying the gel, heat it up to 185°C in a box-type resistance furnace at a rate of no more than 2°C per minute, keep this temperature for 5 hours, and continue to heat up at a rate of no more than 2°C per minute The temperature was raised to 310°C at a certain speed, kept at this temperature for 3 hours, and cooled naturally to room temperature to obtain the Pt atom doped by MoO 3 、WO 3 and Al 2 o 3 Composed of com...

Embodiment 2

[0013] Dissolve ammonium paratungstate in an aqueous hydrochloric acid solution with a mass fraction of 13% to form a solution A, and dissolve aluminum sulfate octadecahydrate in a citric acid aqueous solution with a mass fraction of 17% to form a solution B. Under continuous stirring, slowly add solution B to In solution A, add agar powder, heat up to 95°C and stir continuously until the solution is clear, add ammonium molybdate crystals directly into the solution and stir until completely dissolved, then add glucose and chloroplatinic acid, and reflux at 108°C for 3 hours, Cool to room temperature to form a gel. After drying the gel, raise the temperature to 190°C in a box-type resistance furnace at a rate of no more than 2°C per minute, keep this temperature for 4 hours, and continue to heat up to 190°C at a rate of no more than 2°C per minute. Speed ​​up to 320°C, keep this temperature for 2 hours, cool down to room temperature naturally to get Pt atoms doped by MoO 3 、WO ...

Embodiment 3

[0017] Ammonium metatungstate and tungsten hexachloride are dissolved in 15% hydrochloric acid aqueous solution to form solution A, and aluminum perchlorate nonahydrate and aluminum acetate are dissolved in 15% citric acid aqueous solution to form solution B. Under continuous stirring, slowly add solution B to solution A, add agar powder, raise the temperature to 95°C and continue to stir until the solution is clear, add ammonium molybdate crystals directly to this solution and stir until completely dissolved, then add glucose and chlorine Platinic acid, reflux at 109°C for 3 hours, cool to room temperature to form a gel, after drying the gel, raise the temperature to 195°C at a rate of no more than 2°C per minute in a box-type resistance furnace, and maintain this temperature For 3 hours, continue to heat up to 340°C at a rate of no more than 2°C per minute, keep this temperature for 2 hours, and cool naturally to room temperature to obtain Pt atom doped by MoO 3 、WO 3 and A...

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Abstract

The invention discloses a low-temperature catalytic luminescence sensitive material for benzene. The low-temperature catalytic luminescence sensitive material for benzene is characterized by being a composite powder material comprising Pt atom doped MoO3, WO3 and Al2O3, wherein the mass percentages of the components are 1.6 to 2.2% of Pt, 26 to 30% of MoO3, 36 to 42% of WO3 and 27 to 31% of Al2O3,and the preparation method of the low-temperature catalytic luminescence sensitive material comprises the following steps: dissolving tungsten salt in a hydrochloric acid aqueous solution, dissolvingaluminum salt in a citric acid aqueous solution, adding agar powder after mixing the hydrochloric acid aqueous solution with the citric acid aqueous solution, then dissolving ammonium molybdate crystals into the solution, adding glucose and chloroplatinic acid, performing reflux, cooling, forming a gel, drying the gel, calcining, and naturally cooling to obtain the sensitive material. A gas sensor made from the sensitive material provided by the invention can rapidly determine trace benzene in air at the working temperature not exceeding 200 DEG C without interference from other common coexisting substances.

Description

technical field [0001] The invention relates to a low-temperature catalytic luminescence sensitive material of benzene, especially MoO doped with platinum atoms 3 、WO 3 and Al 2 o 3 A composite powder material composed of the invention belongs to the field of sensing technology. Background technique [0002] Benzene is a chemical raw material with an aromatic smell, and its output and production technology level are one of the symbols of a country's petrochemical development level. At room temperature, benzene is a colorless, sweet-smelling transparent liquid with a density less than water and a strong aromatic odor. Benzene has a boiling point of 80.1°C and a melting point of 5.5°C; benzene is a good organic solvent with a strong ability to dissolve organic molecules and some non-polar inorganic molecules. Miscible with most organic solvents. Benzene in the air mainly comes from architectural coatings, decorative paints, adhesive solutions and automobile exhaust. Ben...

Claims

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Application Information

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IPC IPC(8): G01N21/76
CPCG01N21/766
Inventor 周考文魏建强范慧珍
Owner BEIJING UNION UNIVERSITY
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