Method and system for detecting carbon-containing compounds based on catalytic conversion technology

A technology for catalytic oxidation and organic compounds, which is applied in chemical analysis by catalysis, measuring devices, chemical analysis by combustion, etc. It can solve the problems of increased background noise of instruments, interference with oxygen-containing compound analysis, and consumption of carbon deposits. Achieve high detection sensitivity

Active Publication Date: 2020-08-04
BEIJING SDL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the higher the temperature of the cracking furnace, the higher the cracking rate, the higher the detection sensitivity, but too high temperature will reduce the life of the cracking element of the reactor; if the gas path contains a small amount of O 2 、H 2 O, CO, CO 2 Oxygenates, such as oxygenates, which interfere with the analysis of oxygenates and can consume carbon deposits, while exothermic in large quantities, damaging the pyrolysis element
Moreover, the presence of these substances will increase the background noise of the instrument and cause the baseline to be unstable

Method used

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  • Method and system for detecting carbon-containing compounds based on catalytic conversion technology
  • Method and system for detecting carbon-containing compounds based on catalytic conversion technology
  • Method and system for detecting carbon-containing compounds based on catalytic conversion technology

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preparation example Construction

[0072] The preparation of palladium-6201 catalyst: take a certain amount of palladium chloride (PdCl 2 ), it is dissolved with deionized water under acidic conditions, and the amount of solution should be able to immerse the red carrier (40-60 mesh) of 6201 diatomite type. Place it for 2 hours, evaporate it to dryness under gentle stirring, then put it into a U-shaped tube, place it in a heating furnace, and dry it with air at 100°C for 30 minutes, then raise the temperature to 500°C for 4 hours, and then lower the temperature to At 400°C, replace with nitrogen for 10 minutes, and then introduce hydrogen for reduction for 9 hours. Then replace with nitrogen for 10 min. That is, a black-brown palladium-6201 catalyst was obtained.

[0073] The methanation chamber in the methane conversion furnace adopts a stainless steel column with a length of about 20cm and an inner diameter of 3mm, which contains a nickel-based catalyst of 40-60 mesh. The nickel catalyst is sold by mainstre...

Embodiment 1

[0075] In this embodiment, the method and system provided by the present invention are used to detect the mixed gas of formaldehyde, methane and carbon dioxide.

[0076] The detection of formaldehyde in the air is a more practical example. General air contains 380ppm of CO 2 And 1.76ppm methane, the detection of formaldehyde often needs to separate and test these three components.

[0077] use figure 1 Working mode, wherein the first chromatographic column is a stainless steel chromatographic column with a length of 2 m and an inner diameter of 1 / 8 inch, and the stationary phase is 80-100 mesh Hayesep Q, and the sample is separated at room temperature of about 20 ° C;

[0078] The catalytic oxidation column (that is, the catalytic oxidation furnace) adopts a stainless steel column with a length of about 20cm and an inner diameter of 3mm, and a 40-60-mesh palladium-6201 catalyst is used inside. The 40-60 mesh nickel catalyst is installed inside the two U-shaped grooves of th...

Embodiment 2

[0083] In this embodiment, the method and system provided by the present invention are used to detect formic acid.

[0084] use figure 1 Working mode, the first chromatographic column chooses Restek's MXT-624 stainless steel capillary column, 30m long, 0.53mm inner diameter, 3um film thickness, and the sample is separated at room temperature at about 20°C;

[0085] The catalytic oxidation column (that is, the catalytic oxidation furnace) adopts a stainless steel column with a length of about 20cm and an inner diameter of 3mm, and a 40-60-mesh palladium-6201 catalyst is used inside. The 40-60 mesh nickel catalyst is installed inside the two U-shaped grooves of the same heating aluminum block, and then filled with glass insulation wool in the heat insulation box. The temperature of the two reaction chambers is the same and controlled at 400 °C;

[0086] Use high-purity nitrogen as the carrier gas to enter the first chromatographic column, the flow rate is 20mL / min, the flow rat...

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Abstract

The invention relates to a method for detecting a carbonaceous compound based on a catalytic conversion technology and a system thereof. The method comprises the following steps: 1) under condition ofexistence of oxygen, a to-be-detected sample is subjected to catalytic oxidation combustion to generate carbon dioxide; 2) the generated carbon dioxide in the step 1) is subjected to catalytic hydrogenation reduction under existence of hydrogen to generate methane; and 3) a hydrogen flame ionization detector is used for detecting the methane generated in the step 2). The provided method and the system use catalytic oxidation combustion and catalytic hydrogenation reduction to indirectly realize detection of the microscale or trace carbonaceous compound by the hydrogen flame ionization detector, CO and CO2 and an organic matter can be simultaneously detected, and method has high detection sensitivity for formaldehyde, formic acid and methanamide which are difficulty detected by a routine method.

Description

technical field [0001] The present invention generally relates to the detection of carbon-containing compounds, in particular to a method and system for detecting carbon-containing compounds based on catalytic conversion technology. Background technique [0002] Carbon-containing compounds in the atmospheric environment mainly include carbon oxides and hydrocarbons, and carbon oxides are mainly carbon monoxide (CO) and carbon dioxide (CO 2 ), hydrocarbons are organic substances, mainly including saturated hydrocarbons, unsaturated hydrocarbons, and oxygen-containing hydrocarbons, such as aldehydes, ketones, alcohols, acids, ethers, esters, etc. [0003] At present, there is no ideal measurement method for oxygen-containing hydrocarbons, and they are an important category of atmospheric volatile organic compounds (VOCs), most of which have high reactivity and can participate in atmospheric photochemical reactions. Studies have confirmed that many oxygenated hydrocarbons can ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/68G01N30/06
CPCG01N30/02G01N30/08G01N30/32G01N30/68G01N31/10G01N31/12G01N2030/324
Inventor 敖小强张云
Owner BEIJING SDL TECH
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