Precise gas adsorption system for programmed temperature desorption

A technology of programmed temperature rise and gas adsorption, which is applied in gas treatment, membrane technology, dispersed particle separation, etc., can solve the problems that the uniformity of adsorption cannot be guaranteed, and the gas adsorption cannot be accurately controlled, so as to improve the applicability

Inactive Publication Date: 2020-10-16
ZHEJIANG NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The traditional gas adsorption method is the background adsorption method, which cannot accurately control the gas adsorption, and the uniformity of the adsorption cannot be guaranteed

Method used

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  • Precise gas adsorption system for programmed temperature desorption
  • Precise gas adsorption system for programmed temperature desorption
  • Precise gas adsorption system for programmed temperature desorption

Examples

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Embodiment Construction

[0028] The present invention will be further explained below in conjunction with the embodiments and the accompanying drawings. The following examples are only used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0029] A sophisticated gas adsorption system for temperature programmed desorption, such as Figure 1-4 As shown, including vacuum subsystem, gas path subsystem and gas sampling head,

[0030] The vacuum subsystem includes a backing pump 35, a vacuum pump 34, a vacuum chamber, and a vacuum gauge 38. The backing pump 35 can be a dry backing pump, and the vacuum pump 34 can be a molecular pump. The backing pump 35 and the vacuum pump 34 pass Fore-stage pump valve 43, pipeline connection, fore-stage pump 35 is connected with vacuum chamber through fore-stage pump valve 43, pipeline, valve 36, and vacuum pump 34 is connected with vacuum chamber through vacuum pump valve 37, pipeline; Vacuum chamber is provided with...

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Abstract

The invention discloses a precise gas adsorption system for programmed temperature desorption. The system comprises a vacuum subsystem, a gas path subsystem and a gas sample injection head. The vacuumsubsystem comprises a preceding-stage pump, a vacuum pump, a vacuum cavity and a vacuum gauge; the gas path subsystem comprises a single gas path, double gas paths or a plurality of gas paths, and each gas path comprises a sample pool, a gas storage tank and a precision vacuum gauge; the gas sample injection head is an overflow molecular beam sample injection head, the outlet end is a porous micro-channel plate, and the gas sample injection head is provided with a heating part. Compared with a traditional gas adsorption mode, the precise gas adsorption system has the advantages that precise adsorption of different gases smaller than 0.1 monomolecular layer (ML) in the temperature programming desorption system is achieved, the gas system of the device can rapidly switch the different gases, and the number of paths of parallel gases can be rapidly expanded / reduced.

Description

technical field [0001] The invention relates to the technical field of instruments and equipment, in particular to a precision gas adsorption system for temperature-programmed desorption. Background technique [0002] Temperature-programmed desorption (TPD) systems are widely used in the study of catalytic processes. After the molecules are adsorbed on the catalyst surface, when the catalyst is heated, the molecules adsorbed on the catalyst surface are heated to the energy barrier (usually called the desorption activation energy) needed to overcome the escape, and the molecules are desorbed from the catalyst surface. Due to the different binding abilities between different adsorbates and the same surface, or between the same adsorbate and adsorption centers with different properties on the surface, the energy required for desorption is also different. Therefore, the results of thermal desorption experiments not only reflect the binding ability between the adsorbate and the ...

Claims

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Application Information

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IPC IPC(8): B01D53/04
CPCB01D53/04B01D53/0407B01D2259/40088
Inventor 杨文绍唐登芳蔡凌云刘雪刚简继文俞盛锐丁云杰
Owner ZHEJIANG NORMAL UNIVERSITY
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