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A kind of preparation method of pre-reduced copper-zinc-aluminum low temperature shift catalyst

A technology for changing catalysts, copper, zinc and aluminum, which is applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of reducing the promotion value of catalysts, low reduction degree, etc. Guaranteed to use the effect of the effect

Active Publication Date: 2021-03-05
江苏中正陶瓷科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

UCI once had a C18-HCRS catalyst report [Nitrogen NO.168, July-August 1987]. This catalyst was prepared by passivation after reduction to form a protective film. Since the reduction degree of this catalyst is low (87%), it should be used before use. It needs to be reduced again, so the promotion value of the catalyst is reduced

Method used

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  • A kind of preparation method of pre-reduced copper-zinc-aluminum low temperature shift catalyst
  • A kind of preparation method of pre-reduced copper-zinc-aluminum low temperature shift catalyst
  • A kind of preparation method of pre-reduced copper-zinc-aluminum low temperature shift catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] refer to figure 1 , take 120ml ZZC-7L industrial catalyst and put it into the reduction furnace, and pass the mixed gas of nitrogen and hydrogen into the reduction furnace. The mixed gas of nitrogen and oxygen is used to passivate the surface of the catalyst. The content of oxygen in the mixed gas of nitrogen and oxygen is 0.1%, the passivation time is 1 hour, and the passivation temperature in the reduction furnace is 25 °C, and then add ethanol-water-methane The mixture stabilizer, and finally the catalyst was packaged under the protection of non-oxidizing gas nitrogen, and the pre-reduced low-temperature shift catalyst ZZC-7L-RBS was prepared, and the activity was compared after being placed for 6 months. The results are as follows:

[0020]

[0021] *Catalyst activity testing conditions are: normal pressure, 200°C, heat-resistant temperature 400°C, mixed gas air velocity 2000h -1 ,Steam / CO=6, raw gas CO is 4.47%, 50ml sample is loaded.

Embodiment 2

[0023] refer to figure 1 , take 120ml ZZC-7L industrial catalyst and put it into the reduction furnace, and pass the mixed gas of nitrogen and hydrogen into the reduction furnace. The mixed gas of nitrogen and oxygen is used to passivate the surface of the catalyst. The content of oxygen in the mixed gas of nitrogen and oxygen is 25%, the passivation time is 10 hours, and the passivation temperature in the reduction furnace is 200 °C, and then add ethanol-methanol-acetone The mixture stabilizer, and finally the catalyst was packaged under the protection of non-oxidizing gas nitrogen, and the pre-reduced low-temperature shift catalyst ZZC-7L-RBS was prepared, and the activity was compared after being placed for 6 months. The results are as follows:

[0024]

[0025] *Catalyst activity detection is carried out according to chemical standards, and the activity test conditions are: normal pressure, 200°C, heat-resistant temperature 400°C, mixed gas air velocity 2000h -1 ,Steam...

Embodiment 3

[0027] refer to figure 1 , take 120ml ZZC-7L industrial catalyst and put it into the reduction furnace, and pass the mixed gas of nitrogen and hydrogen into the reduction furnace. The mixed gas of nitrogen and oxygen is used to passivate the surface of the catalyst. The content of oxygen in the mixed gas of nitrogen and oxygen is 15%, the passivation time is 5 hours, the passivation temperature in the reduction furnace is 100 °C, and then add ethylene glycol-methanol - Carbon dioxide-water mixture stabilizer, and finally encapsulate the catalyst under the protection of non-oxidizing gas nitrogen to prepare the pre-reduced low-temperature shift catalyst ZZC-7L-RBS, and compare the activity after standing for 6 months, the results are as follows:

[0028]

[0029] *Catalyst activity testing conditions are: normal pressure, 200°C, heat-resistant temperature 400°C, mixed gas air velocity 2000h -1 ,Steam / CO=6, raw gas CO is 4.47%, 50ml sample is loaded.

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Abstract

The invention discloses a preparation method for a pre-reduction type copper-zinc-aluminum low-temperature shift catalyst. The preparation method comprises the following steps of putting the existingoxidizing type copper-zinc-aluminum low-temperature shift catalyst into a reduction furnace, and introducing reductive gas into the reduction furnace to perform reduction reaction on the catalyst; when the catalyst is completely reduced in the reduction furnace introducing a stabilizer into the reduction furnace to react with the catalyst; packaging the copper-zinc-aluminum low-temperature shift catalyst in the reduction furnace under the protection environment of non-oxidizing gas. The preparation method has the advantages that the pre-reduction type is adopted for the copper-zinc-aluminum low-temperature shift catalyst, and the re-reduction is not needed before the catalyst is used for a factory; the activity of the catalyst is equivalent to the activity of the market industrial low-temperature shift catalyst after reduction, so that a large amount of production time of the factory is shortened, and a large amount of reduction cost of the factory is reduced; the reduction step of thefactory is not needed, and the temperature runaway due to false operation in the reduction process of the factory is avoided.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and relates to the CO shift reaction (CO+H 2 O=CO 2 +H 2 ) preparation of commonly used catalysts, in particular to a preparation method of a pre-reduced copper-zinc-aluminum low-temperature shift catalyst. Background technique [0002] The copper-zinc-aluminum low-temperature shift catalyst is mainly used for hydrogen production in the low-temperature shift section of the ammonia synthesis process. In the low-temperature shift section, the process gas containing about 4% CO in the outlet gas of the high-temperature shift section passes through the copper-zinc-aluminum low-temperature shift catalyst bed and is converted into CO at about 200°C 2 and H 2 , The export CO content is below 0.4%. At present, the main components of the existing copper-zinc-aluminum low-temperature shift catalysts are copper-zinc-aluminum oxides. Since the active center of the low-temperature shift cata...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/80B01J37/18C01B3/16C01B32/50
CPCB01J23/80B01J37/18C01B3/16C01B32/50Y02P20/52
Inventor 谢建川史天石
Owner 江苏中正陶瓷科技有限公司
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