Ammonia synthetic catalyst and method for making the same

A catalyst, ammonia synthesis technology, used in the preparation/separation of ammonia, chemical instruments and methods, catalysts for physical/chemical processes, etc.

Inactive Publication Date: 2004-03-17
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the ruthenium-based ammonia synthesis catalysts are based on carbon,

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] 1.0450g of KF·H 2 O was dissolved in an appropriate amount of deionized water, and the above solution was immersed in 5.6142 g of MgO for 5 h by immersion method, the water was removed by rotary evaporation, and dried in air at 120 ° C for 12 h to obtain KF / MgO. 0.2942g of RuCl containing 37% Ru 3 ·nH 2 O is dissolved in an appropriate amount of acetone, immersed in the above KF / MgO 3.2370g6h, making Ru / MgO=4 / 100 (weight ratio), Ru / KF=1 / 5 (molar ratio), rotary evaporation to remove acetone, in the air After drying at 120°C for 12 hours, the Ru-KF / MgO ammonia synthesis catalyst was obtained. The catalyst 0.5g in H 2 After reduction at 425°C for 24 hours under air flow, the synthesis gas is switched, and the composition of the synthesis gas is N 2 / H 2 =1 / 3, the flow rate is 1800ml / h. The catalytic activity was measured at a pressure of 1 MPa. Reference catalyst Ru-KO 1 / 2 / MgO was also prepared and evaluated under the same conditions. The results show that the ac...

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PUM

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Abstract

The present invention relates to catalyst, and is especially new ammonia synthesizing catalyst, which has noble metal Ru as active component, fluoride of alkali metal or alkali earth metal as assistant and magnesia as carrier and has high activity, and its preparation process. The catalyst has Ru/MgO ratio of 3-8 % and molar Ru/MFx of 0.5-8, the solvent adopted is water or organic solvent capable of dissolving RuCl3.nH2O or carbonyl ruthenium. The catalyst is prepared via soaking process or mechanically mixing, calcination and soaking process. It is used mainly in catalyzing the synthesis of ammonia with nitrogen and hydrogen. The greater electronegativity of F in fluoride may accelerate the hydrogenation of N to synthesize ammonia, and the catalyst has activity 1-3 times that of catalyst with oxide rather than fluoride and has the lower use temperature and pressure of ammonia synthesizing Ru catalyst maintained.

Description

(1) Technical field [0001] The invention relates to an ammonia synthesis catalyst, in particular to a novel highly active ammonia synthesis catalyst which uses noble metal ruthenium as an active component, alkali metal or alkaline earth metal fluoride as an auxiliary agent, and magnesium oxide as a carrier and a preparation method thereof. (2) Background technology [0002] Ammonia synthesis catalyst is the most important catalyst in the ammonia synthesis industry, which directly affects the economic benefits of ammonia synthesis and the production process of ammonia synthesis. The traditional ammonia synthesis catalyst is a molten iron catalyst, which is relatively mature in technology, but its operating pressure and temperature are relatively high. It not only requires high equipment, but also requires high energy consumption in the process. Therefore, finding a low-temperature, low-pressure and high-activity ammonia synthesis catalyst has become the direction and goal of ...

Claims

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Application Information

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IPC IPC(8): B01J23/46C01C1/04
CPCY02P20/52
Inventor 廖代伟林敬东王欣莹陈鸿博蔡启瑞
Owner XIAMEN UNIV
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