Catalyst for ammonia synthesis

A catalyst and a technology for synthesizing ammonia, which is applied in the field of highly active ammonia synthesis catalysts and can solve the problems of high activity of catalysts

Active Publication Date: 2017-06-23
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

[0003] Alkali metals and alkaline earth metals have been widely used as additives in ammonia synthesis catalysts, but most of them are added in the form of oxides. Althou

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1gFe 2 After N and LiH were mixed according to the molar ratio of 1:2, they were ball-milled with a planetary ball mill for 24 minutes, and 0.5 g of the sample was placed in a quartz tube reactor, and then 2 Rise to 300°C at 5K / min under the atmosphere, and pre-activate under this condition for 3 days, then cool down to 200°C, switch to syngas, (N 2 and H 2 Mixed gas with a molar ratio of 1:3), the GHSV of the mixed gas is 10000ml / h / g, the pressure of the mixed gas is increased to 10bar, and the temperature rise test is started from 200°C, the results are as follows figure 1 shown.

Embodiment 2

[0029] Repeat Example 1, just replace LiH with LiNH of equimolar amount 2 , the activity results as figure 2 shown.

Embodiment 3

[0031] According to the method in Example 1, after the same catalyst is preactivated, H 2 , N 2 Mixed gas, keep the temperature constant at 300°C, change the space velocity of the reaction gas, and test the relationship between the speed of the catalyst to synthesize ammonia and the space velocity, such as image 3 shown.

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Abstract

The invention relates to a catalyst for ammonia synthesis. The catalyst comprises nitrogen containing/hydrogen containing/nitrogen and hydrogen containing compounds of main group elements, and nitrides of transition metal VIII group elements as well as related carriers or additives. The product is a novel catalyst for ammonia synthesis, and has excellent catalytic activity in the reaction of ammonia synthesis, especially in a condition with relatively low temperature and low pressure (lower than 30 bar, and lower than 300 DEG C).

Description

technical field [0001] The invention relates to catalyst technology, especially a highly active catalyst for ammonia synthesis, which is suitable for catalyzing the synthesis of ammonia starting from the mixed gas of nitrogen and hydrogen. Background technique [0002] At present, the annual energy consumption of ammonia synthesis in the world accounts for about 1% of the world's energy consumption, which is mainly determined by the characteristics of the catalysts used in industry. Iron-based catalysts are mainly used in the industry (internationally, ferric oxide is the main component, and my country's original catalyst is ferrous oxide as the main component). This type of catalyst is based on aluminum oxide, potassium oxide, calcium oxide, And rare earth oxides as promoters. There are two main characteristics of iron-based catalysts: first, this type of catalyst needs to be operated under high temperature and high pressure conditions, which not only requires relatively hi...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J23/58B01J23/78C01C1/04
CPCB01J23/58B01J23/78B01J27/24C01C1/0411Y02P20/52
Inventor 陈萍王培坤郭建平常菲高文波
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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