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Ferrous oxide-based ammonia synthesis catalyst

A ferrous oxide and catalyst technology, which is applied in the field of highly active ferrous oxide-based ammonia synthesis catalysts, can solve the problems of slow reduction, low activity, and long non-production time, and achieve the effect of enhanced activation and enhanced adsorption and activation

Active Publication Date: 2013-02-06
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Various types of catalysts are available at a pressure of 15MPa, a temperature of 425°C, and a space velocity of 3.0×10 4 Hour -1 , under the condition of particle size 1.0-1.4mm, the catalytic activity (outlet ammonia concentration) is lower than 17-18.5%, the activity at lower pressure and temperature is lower and the reduction speed is slow, taking up a long non-production time, which cannot meet the requirements of industrial Practical application needs, so catalytic activity, reduction performance, etc. need to be further improved

Method used

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  • Ferrous oxide-based ammonia synthesis catalyst

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Embodiment 1

[0045] Embodiment 1 (the following component content is percentage by weight, the same below)

[0046] According to the ratio of selected magnetite powder 73.4, pure iron powder 20.1, alumina 2.2, potassium oxide 0.7, calcium oxide 2.5, magnesium oxide 0.4, tungsten oxide 0.7, put it in the mixer and mix it for a certain period of time. In the electric melting furnace, it is directly melted in the atmosphere. At the end of melting, put the liquid molten material into the cooling tank and cool it below 200°C. After cooling, the frit is crushed, ball milled and sieved to obtain the product with the required particle size. The final composition of the catalyst prepared at the end of melting is controlled as: the ratio of the amount of ferrous iron to ferric iron Fe 2+ / Fe 3+ 4.6, the iron oxide content is 93.5%, alumina (A1 2 o 3 ) 2.2%, potassium oxide (K 2 O) 0.7%, calcium oxide (CaO) 2.5%, magnesium oxide (MgO) 0.4%, tungsten oxide (WO 3 ) 0.7%. The oxide of iron in the...

Embodiment 2

[0048] According to the ratio of selected magnetite powder 72.3, pure iron powder 21.7, alumina 2.1, potassium oxide 0.7, calcium oxide 1.82, magnesium oxide 0.6, vanadium oxide (raw material is metavanadic acid) 0.6, tungsten oxide 0.6, zirconia 0.44 The ingredients are mixed and stirred in a mixer for a certain period of time, and then put into an electric melting furnace after being uniform, and melted directly in an atmospheric environment. At the end of melting, put the liquid molten material into the cooling tank and cool it below 200°C. After cooling, the frit is crushed, ball milled and sieved to obtain the product with the required particle size. The final composition of the catalyst prepared at the end of melting is controlled as: the ratio of the amount of ferrous iron to ferric iron Fe 2+ / Fe 3+ is 5.0, the content of iron oxide is 93.14%, alumina (A1 2 o 3 ) 2.1%, potassium oxide (K 2 O) 0.7%, calcium oxide (CaO) 1.82%, magnesium oxide (MgO) 0.6%, vanadium oxi...

Embodiment 3

[0050] According to selected magnetite powder 71.1, pure iron powder 22.7, alumina 2.0, potassium oxide 0.6, calcium oxide 1.5, magnesium oxide 0.5, vanadium oxide (raw material is ammonium metavanadate) 0.5, tungsten oxide 0.5, titanium oxide 0.6 Proportional ingredients, placed in a mixer, mixed and stirred for a certain period of time, evenly put into an electric melting furnace, and directly melted in an atmospheric environment. At the end of melting, put the liquid molten material into the cooling tank and cool it below 200°C. After cooling, the frit is crushed, ball milled and sieved to obtain the product with the required particle size. The final composition of the catalyst prepared at the end of melting is controlled as: the ratio of the amount of ferrous iron to ferric iron Fe 2+ / Fe 3+ 7.1, the content of iron oxide is 93.8%, alumina (A1 2 o 3 ) 2.0%, potassium oxide (K 2 O) 0.6%, calcium oxide (CaO) 1.5%, magnesium oxide (MgO) 0.5%, vanadium oxide (V 2 o 5 ) 0...

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Abstract

The invention discloses a ferrous oxide-based ammonia synthesis catalyst. The ferrous oxide is taken as a main phase component, and potassium oxide, calcium oxide, aluminum oxide, magnesium oxide and other metal oxides are used as auxiliary catalysts. The ferrous oxide-based ammonia synthesis catalyst is prepared by a melting method. The catalyst has high activity to catalyze nitrogen and hydrogenate to synthesize ammonia, easy to reduce, and great in heat resistance and antitoxic and has mechanical performances. The catalyst is suitable to be used in various sizes of ammonia synthesizing devices, and particularly suitable for a low-pressure and low-energy consumption ammonia synthesizing technique; and obvious energy saving, consumption reduction, efficiency increasing, cost saving and economic benefits are achieved.

Description

Technical field: [0001] The invention relates to a catalyst, especially a highly active ferrous oxide-based ammonia synthesis catalyst, which is suitable for the preparation of an ammonia synthesis catalyst and its application in the industry of nitrogen hydrogenation to ammonia and ammonia cracking to produce pure nitrogen and hydrogen. Background technique: [0002] Before the present invention was made, the industrial ammonia synthesis catalysts all used iron oxide as the main component, and the ammonia synthesis catalyst with iron ferric oxide as the main component had a long history and good use effect. The content of ferric oxide in this type of catalyst is 75-95%, and the content of co-catalyst is 3-10%. One is the cocatalyst, the ratio of ferrous iron to ferric iron (Fe 2+ / Fe 3+ ) is 0.4-0.8. The most advanced similar catalyst in the world is the cobalt-containing ferric oxide-based ICI74-1 catalyst produced by the British ICI company. [0003] The ammonia synth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889C01C1/04
CPCY02P20/52
Inventor 刘化章李小年岑亚青
Owner ZHEJIANG UNIV OF TECH
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