Plasma-assisted method for catalyzing nitrogen activation dissociation by metal cluster

A technology of metal plasma and nitrogen, which is applied in the field of cluster science, can solve the problems of difficult activation and dissociation of nitrogen, unfavorable environmental protection, harsh reaction conditions, etc., and achieve the effect of optional metal targets, easy operation, and mild experimental conditions

Inactive Publication Date: 2020-12-22
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0002] The activation and conversion of nitrogen under mild conditions is one of the important challenges in the field of chemistry, which is due to the extremely high bond energy of the N≡N triple bond (~941kJ mol -1 ) and N 2 The huge HOMO-LUMO gap (~10.82eV) of the molecule makes the activation and dissociation of nitrogen very difficult
At present, the method of nitrogen reduction synthesis ammonia used in industry is mainly the traditional Haber-Bosh method, but the reaction conditions of this method are harsh, requiring extremely high temperature (~700K) and pressure (~100atm), and the energy consumption is huge. During the production process It also emits large amounts of CO 2 , not conducive to environmental protection

Method used

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  • Plasma-assisted method for catalyzing nitrogen activation dissociation by metal cluster
  • Plasma-assisted method for catalyzing nitrogen activation dissociation by metal cluster

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) At room temperature, use a mechanical pump and a molecular pump to pump the air pressure of the cluster beam source cavity and the mass spectrometry detection vacuum chamber to 10 -5 below pa;

[0035] (2) Turn on the laser and preheat it, put the prepared 10.0atm N 2 / He gas mixture (N 2 The volume percent concentration is 5%) into the pipeline connected with the intake valve;

[0036] (3) Add voltage to the accelerating electric field in the mass spectrometer, reflected electric field and microchannel plate detector, microchannel plate voltage 2050V, accelerating electric field electrode voltage 2685V, 1500V, reflected electric field electrode voltage 2805V, 1575V;

[0037] (4) Set the pulse width of the carrier gas pulse valve to 235 μs and open it. At this time, the pressure of the cluster beam source cavity is 3.9×10 -3 Pa, the pressure of the mass spectrometry vacuum chamber is 1.1×10 -5 Pa; turn on the motor to make the rhodium target rotate at a constant...

Embodiment 2

[0043] (1) At room temperature, use a mechanical pump and a molecular pump to pump the air pressure of the cluster beam source cavity and the mass spectrometry detection vacuum chamber to 10 -5 below pa.

[0044] (2) Turn on the laser and preheat it, put the prepared 10.0atm N 2 / He gas mixture (N 2 The volume percent concentration is 5%) into the pipeline connected with the intake valve;

[0045] (3) Add voltage to the accelerating electric field in the mass spectrometer, reflected electric field and microchannel plate detector, microchannel plate voltage 1950V, accelerating electric field electrode voltage 2685V, 1500V, reflected electric field electrode voltage 2805V, 1575V;

[0046] (4) Set the pulse width of the carrier gas pulse valve to 230 μs and open it. At this time, the pressure of the cluster beam source cavity is 3.0×10 -3 Pa, the pressure of the mass spectrometry vacuum chamber is 1.1×10 -5 Pa, turn on the motor to make the platinum target rotate at a constan...

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Abstract

The invention discloses a plasma-assisted method for catalyzing nitrogen activation dissociation by metal cluster, and belongs to the technical field of cluster science. The method comprises the following steps: in a vacuum cavity, nitrogen or mixed gas of nitrogen passes through a metal plasma area, and then activated dissociation of the nitrogen is achieved. According to the method, dissociationof nitrogen molecules can be achieved through a method of generating metal plasmas through laser sputtering under the room temperature condition, and high temperature and high pressure in the nitrogen catalytic reaction process in the prior art are avoided. The method disclosed by the invention is simple and convenient to operate, a used metal target material is selectable, and a reliable methodis provided for nitrogen dissociation and subsequent nitrogen-containing compound generation.

Description

technical field [0001] The invention relates to the field of cluster science and technology, in particular to a method for plasma-assisted metal cluster catalyzed activation and dissociation of nitrogen. Background technique [0002] The activation and conversion of nitrogen under mild conditions is one of the important challenges in the field of chemistry, which is due to the extremely high bond energy of the N≡N triple bond (~941kJ mol -1 ) and N 2 The huge HOMO-LUMO gap (~10.82eV) of the molecule makes the activation and dissociation of nitrogen very difficult. At present, the method of nitrogen reduction synthesis ammonia used in industry is mainly the traditional Haber-Bosh method, but the reaction conditions of this method are harsh, requiring extremely high temperature (~700K) and pressure (~100atm), and the energy consumption is huge. During the production process It also emits large amounts of CO 2 , is not conducive to environmental protection. Therefore, it is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/64C01B21/06
CPCC01B21/0615C01P2002/89G01N27/64
Inventor 骆智训崔超男贾钰涵
Owner INST OF CHEM CHINESE ACAD OF SCI
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