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A method for measuring the channel diffusion factor of porous materials

A determination method and technology of porous materials, applied in the field of preparation of porous materials, can solve the problem of not being able to characterize and measure the degree of pore tortuosity and the degree of restriction of molecular diffusion.

Active Publication Date: 2020-12-08
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there is no reliable method to characterize and measure the tortuosity of the pore, the degree of diffusion limitation of the pore space to molecules, etc.

Method used

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  • A method for measuring the channel diffusion factor of porous materials
  • A method for measuring the channel diffusion factor of porous materials
  • A method for measuring the channel diffusion factor of porous materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] Embodiment 1: the synthesis of reference sample

[0082] The porous material reference sample of the present invention is the Al of surface Al modification 2 o 3 / SiO 2 Opal, the synthesis process is as follows:

[0083] Add 504mL of ethanol, 130mL of water and 40mL of ammonia water with a mass fraction of 25% in a 2000mL three-necked flask. Then 0.333 g of silica sol with a solid content of 30% by weight and an average particle diameter of about 30 nm was added to a three-necked flask, and the temperature of the reaction solution was controlled at 30°C. Then, under the state of mechanical stirring, the mixed solution prepared by 61mL concentration of 25% by weight ammonia, 35mL water and 104mL ethanol was added dropwise, and the mixed solution prepared by 163mL tetraethyl orthosilicate and 37mL methanol was added dropwise. for 3 hours. Continue to react for 2 hours after the dropwise addition, then centrifuge, wash with water and separate to obtain ~300nm monodisp...

Embodiment 2

[0086] Embodiment 2: the preparation of different solute concentration solutions

[0087] Take 2000g of n-octane and 2000g of mesitylene, mix them evenly, add 2,6-lutidine to it, and prepare a solution with a concentration of 2,6-lutidine of 1000ppm, which will be used as a solvent for the diffusion experiment and set aside.

[0088] Take five parts of the above-mentioned solvents, 100 g each, and add dibenzothiophene (DBT) therein to prepare standard solutions with DBT concentrations of 20 ppm, 30 ppm, 40 ppm, 60 ppm, and 80 ppm respectively for future use.

[0089] Take 900g of the above-mentioned solvent, add DBT thereinto, and make a diffusion solution with a DBT concentration of 5000ppm for future use.

[0090] Take 150g of each of the above four solvents, add DBT therein, and prepare adsorption solutions with DBT concentrations of 1000ppm, 3000ppm, 7000ppm, and 9000ppm, respectively, for future use.

Embodiment 3

[0091] Example 3: Creation of Calibration Curve for Dibenzothiophene UV Absorbance

[0092] Measure the absorbance A at 327nm of DBT standard solutions with different concentrations. Plot the DBT concentration (C A ) and absorbance (A) curve, see figure 2 . C A It has a good linear relationship with A, and its linear equation (that is, the DBT ultraviolet absorption calibration curve) is A=0.012832C.

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Abstract

The invention provides a porous material pore diffusion factor measurement method. The porous material pore diffusion factor measurement method comprises the following steps of (1) preparing a known porous material reference sample which is uniform in porosity and orderly in pore structure; (2) measuring the effective diffusion coefficient of De0 of the reference sample and the effective diffusioncoefficient of De of a sample to be measured, wherein De0=DB*epsilon0*f0 / tau0, De=DB*epsilon*f / tau, DB represents bulk diffusion coefficient, epsilon represents porosity, f represents pore restriction factors, and tau represents tortuosity factors; (3) according to the measured efficient diffusion coefficients of the reference sample and the sample to be measured and the pore structure data of the reference sample, calculating the pore diffusion factor of beta of the sample to be measured through the following formula of beta=f / tau.

Description

technical field [0001] The invention relates to the field of preparation of porous materials, in particular, the invention relates to a method for measuring the channel diffusion factor of porous materials. Background technique [0002] Many industrial production processes involve the diffusion of components in porous solids, such as the diffusion of reaction components in the pores of catalysts and the diffusion of adsorbed components in the pores of solid adsorbents. The size of the diffusion velocity in solid pores has a great influence on these industrial processes. For example, when the diffusion rate of reacting molecules in the pores of the catalyst is lower than the intrinsic velocity of the reaction, the reaction is controlled by diffusion. At this time, increasing the diffusion rate of the reacting molecules in the pores can increase the reaction rate and the utilization rate of the catalyst. The diffusion coefficient of molecules in porous media is usually expres...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N13/00
CPCG01N13/00G01N2013/003
Inventor 陈胜利魏亚倩孙伟范婷婷袁桂梅胥明日张长城郭金涛马宝利
Owner PETROCHINA CO LTD
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