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Method for detecting formic acid by using hydrogen flame ionization detector based on catalytic reduction technology

A hydrogen flame and ionization technology, which is applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve the problems that have not been reported publicly, and achieve the effect of cheap price, good repeatability and measurement linearity

Inactive Publication Date: 2013-01-16
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] It is a relatively mature technology to reduce substances that are not sensitive to hydrogen flame ionization detectors (such as carbon monoxide, carbon dioxide, and formaldehyde) through hydrogenation catalysts to generate methanol or methane that has a signal response on hydrogen flame ionization detectors. The method can detect carbon monoxide and carbon dioxide at the concentration of ppm level, but there is no public report on the method of reducing formic acid by hydrogenation catalyst to realize the detection of trace formic acid

Method used

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  • Method for detecting formic acid by using hydrogen flame ionization detector based on catalytic reduction technology
  • Method for detecting formic acid by using hydrogen flame ionization detector based on catalytic reduction technology
  • Method for detecting formic acid by using hydrogen flame ionization detector based on catalytic reduction technology

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Embodiment 1

[0027] Embodiment 1: The catalyst carrier is a macroporous silica gel with a BET specific surface area greater than 300 square meters per gram and an average pore diameter greater than 10 nanometers, and the active components are highly dispersed metallic nickel and alumina, and the active components account for 20% of the total weight of the carrier , wherein nickel accounts for 10% of the total weight of the carrier, alumina accounts for 10% of the total weight of the carrier, the amount of the catalyst is 0.3 g, and the working temperature of the catalyst is 340 degrees Celsius. The carrier gas is hydrogen with a purity better than 99.99%, the flow rate is 30 ml per minute, and no additional hydrogen is added. The combustion-supporting gas of the hydrogen flame ionization detector is natural air purified by color-changing silica gel, the water vapor content dew point is lower than minus 15 degrees Celsius, the hydrocarbon content is lower than 10ppm, and the flow rate is 300...

Embodiment 2

[0028] Embodiment 2: The catalyst carrier is a macroporous silica gel with a BET specific surface area greater than 300 square meters per gram and an average pore diameter greater than 10 nanometers, and the active components are highly dispersed metallic nickel and alumina, and the active components account for 40% of the total weight of the carrier , wherein nickel accounts for 4% of the total weight of the carrier, alumina accounts for 36% of the total weight of the carrier, the amount of the catalyst is 0.3 g, and the working temperature of the catalyst is 380 degrees Celsius. The carrier gas is hydrogen with a purity better than 99.99%, the flow rate is 30 ml per minute, and no additional hydrogen is added. The combustion-supporting gas of the hydrogen flame ionization detector is natural air purified by color-changing silica gel, the water vapor content dew point is lower than minus 15 degrees Celsius, the hydrocarbon content is lower than 10ppm, and the flow rate is 300 ...

Embodiment 3

[0029]Embodiment 3: The catalyst carrier is a macroporous silica gel with a BET specific surface area greater than 300 square meters per gram and an average pore diameter greater than 10 nanometers, and the active components are highly dispersed metallic nickel and alumina, and the active components account for 10% of the total weight of the carrier , wherein nickel accounts for 9% of the total weight of the carrier, alumina accounts for 1% of the total weight of the carrier, the amount of the catalyst is 0.3 g, and the working temperature of the catalyst is 310 degrees Celsius. The carrier gas is nitrogen with a purity better than 99.99%, the flow rate is 30 milliliters per minute, and an additional 35 milliliters of hydrogen is added per minute. The combustion-supporting gas of the hydrogen flame ionization detector is natural air purified by color-changing silica gel, the water vapor content dew point is lower than minus 15 degrees Celsius, the hydrocarbon content is lower t...

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Abstract

The invention provides a method for detecting formic acid by using a hydrogen flame ionization detector based on a catalytic reduction technology. A trace amount of formic acid is reduced into methane in the presence of hydrogen by using a nickel hydrogenation reduction catalyst, and the generated methane is detected by the hydrogen flame ionization detector. The trace amount of the formic acid is indirectly detected by the hydrogen flame ionization detector by the catalytic reduction technology. The method has the advantages that: 1, the trace amount of formic acid can be detected under the condition that the structure of the conventional gas chromatograph of the hydrogen flame ionization detector is not needed to be changed greatly, and the method is high in repeatability and measurement linearity; and 2, catalysts which are used in the method, such as platinum, palladium and other noble metal are not needed, so the price is low.

Description

technical field [0001] The invention relates to a method for detecting formic acid. Specifically, it is a method for indirectly realizing the detection of trace or trace amounts of formic acid by a hydrogen flame ionization detector through catalytic reduction technology. Background technique [0002] Formic acid is a common volatile organic pollutant in the atmosphere. It mainly comes from incomplete combustion of alcohol-containing mixed oil, incomplete combustion or incomplete oxidation of organic matter, decarboxylation process in organic synthesis, and physiological metabolism of ants. Formic acid is a metabolite of human methanol poisoning, and it is the basis for forensic identification of methanol poisoning. [0003] The methods that can be used for the quantitative analysis of formic acid are: acid-base titration, chromatography, infrared spectroscopy. The equipment used in the acid-base titration method is relatively simple, but the operation time is long, the am...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/06
Inventor 杨治张琼
Owner HARBIN ENG UNIV