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Method for synthesizing ammonia

A technology for synthesizing ammonia and complexes, which is applied in the preparation/separation of ammonia, energy input, etc., and can solve problems such as low efficiency, hydrogen evolution, and difficulty in large-scale application.

Inactive Publication Date: 2020-06-02
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the efficiency of direct photocatalytic nitrogen fixation is still quite low (<0.1%), making it difficult to apply on a large scale.
(J.A.C.S, 2017, 139(31): 10929-10936.) After nearly 20 years of development, the electrochemical synthesis of ammonia technology has made great progress. At present, the highest efficiency can reach 35%, but the rate of ammonia formation is still relatively low. Low, and there will be serious hydrogen evolution during nitrogen fixation

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  • Method for synthesizing ammonia
  • Method for synthesizing ammonia

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Experimental program
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Embodiment 1

[0018] 1) First prepare the materials required for chemical looping. Firstly, the transition metal is supported on Co onto the carrier SiO 2 On, get Co / SiO2;

[0019] Co / SiO 2 The preparation process is: 246.7mg Co(NO 3 ) 2 ·6H 2 O was dissolved in 5 ml of deionized water and then added to 450 mg of SiO 2 Then soak it until all the water volatilizes completely, put it in an oven to dry at 80°C for 10h, and then reduce the obtained sample at 400°C for 5h under a hydrogen atmosphere to obtain a Co / SiO2 sample.

[0020] Then the hydride BaH 2 loaded onto the above material to obtain SiO 2 Loaded Co-BaH 2 Composite materials, Co, BaH 2 , SiO 2 The mass ratio is 1:10:9. H 2 The process of loading onto the above material is: take 49.3mg metal Ba and 50mg reduced Co / SiO 2 The sample is placed in the reactor, and then poured into the reactor with liquid ammonia, soaked for 2 hours, and the liquid ammonia in the reactor is pumped out to obtain Co / SiO 2 -Ba(NH 2 ) 2 samp...

Embodiment 2

[0023] 1) operation process is with embodiment 1 step 1), and embodiment 1 step 1) difference is that metal Ba is changed into Ca; Prepare SiO by above steps 2 Loaded Co-CaH 2 composite material.

[0024] 2) Take 30 mg of the above-prepared material and put it into a chemical looping reactor, pass high-purity nitrogen into the reactor, control the gas flow rate at 30ml / min, heat the temperature to 250 degrees Celsius, and switch to hydrogen after staying for 1 hour. The hydrogen flow rate is 30ml / min, first pass the tail gas to the conductivity meter to judge how much time is needed for hydrogenation, this material needs to be hydrogenated for 30min. In the latter process, the tail gas after hydrogenation is directly passed to the container containing MgI2, and passes through the MgI2 2 The gas is passed into the conductivity meter. If the conductivity does not change, it means that all the ammonia has been absorbed. Nitrogen feeding for 1 h and hydrogen gas feeding for 30 ...

Embodiment 3

[0026] 1) The operation process is the same as in Example 1 step 1), and the difference from Example 1 step 1) is that metal Ba is replaced by Li;

[0027] 2) Prepare SiO according to the above steps 2 Supported Co-LiH composites. Take 30 mg of the above-prepared material and put it into a chemical looping reactor, pass high-purity nitrogen into the reactor, control the gas flow rate at 30ml / min, heat the temperature to 250 degrees, switch to hydrogen after staying for 1h, and the hydrogen flow rate is 30ml / min min, first pass the exhaust gas to the conductivity meter to judge how long it takes for hydrogenation, this material takes 60 minutes. In the latter process, the tail gas after hydrogenation is directly passed to the 2 container, after MgI 2 The gas is passed into the conductivity meter. If the conductivity does not change, it means that all the ammonia has been absorbed. Repeat 1 h of nitrogen feed and 1 h of hydrogen feed at the above time. After 10 cycles, by w...

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Abstract

The invention relates to a process for synthesizing ammonia by utilizing renewable energy or nuclear energy under mild conditions. The process is characterized in that clean energy such as solar energy, wind energy, nuclear energy and the like is utilized to produce hydrogen and nitrogen, ammonia is produced through a chemical looping technology, and then an ammonia adsorbent is utilized to absorbammonia. According to the process, renewable energy sources are utilized, CO2 is not generated in the whole process, high pressure is not needed, and the process is an environment-friendly syntheticammonia process. The process is suitable for small-scale regional ammonia production, and the produced ammonia can be used as nearby farmland fertilizers or energy storage media.

Description

technical field [0001] The invention belongs to the field of energy chemical industry, and specifically provides a process for synthesizing ammonia by using clean energy. Background technique [0002] Nitrogen is the most abundant substance in the atmosphere, but due to its own strong nitrogen-nitrogen triple bond, it is difficult to convert it into usable substances. At the same time, nitrogen is an essential element for various animals and plants. Since the 20th century, with the rapid increase of population, more food support is needed, so nitrogen fixation technology is particularly important. At present, the industrial ammonia synthesis is the Haber-Bosch process, which requires high temperature and high pressure (400-500°C, 20-50MPa), which consumes 1%-2% of the world's energy. At the same time, the hydrogen required for it comes from fossil energy, so a large CO2, causing serious environmental problems. (Nat.Geosci.2008,1,636-639.) At the same time, ammonia can be u...

Claims

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Application Information

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IPC IPC(8): C01C1/04
CPCC01C1/04Y02P20/133
Inventor 陈萍高文波郭建平王培坤王倩茹
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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