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Process for preparing ammonia synthesis catalyst

A catalyst, ammonia synthesis technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. problems, to achieve the effect of simple preparation device, large preparation volume flexibility, and short preparation period

Inactive Publication Date: 2002-12-18
FUZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the reduction period is long, the HCl generated during the reduction will corrode equipment and pipelines, and the trace chlorine remaining on the catalyst will affect the activity of the catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Dissolve ruthenium trichloride in water to make impregnation solution. Take the required amount of impregnation liquid and place it in the impregnation tank, add a certain amount of activated carbon (AC) carrier, impregnate for 3-10 minutes, filter out the catalyst and drain it, then place it in a drying oven at 80°C for 15 minutes , take it out and put it in the dipping tank for 3-10 minutes, then put it in a drying oven at 80°C and dry it for 15 minutes, and circulate in this way until the soaking liquid in the dipping tank is completely absorbed by the carrier. The specific surface of the activated carbon carrier used is 857m 2 / g.

[0019] Add 200ml of hydrazine aqueous solution made from 3ml 80% hydrazine aqueous solution and 197ml deionized water to the catalyst soaked in ruthenium. The temperature of the aqueous hydrazine solution is about 30-95°C, and the reduction takes about 20 minutes. The catalyst was leached out after reduction.

[0020] Add 200 ml of p...

Embodiment 2

[0025] Repeat the process of Example 1, but change the dipping method to the spraying method. A certain amount of soaking liquid is sprayed on the used activated carbon carrier of a certain amount of example 1 in several times. The amount of liquid sprayed each time is equivalent to the amount of liquid used in equal volume immersion.

Embodiment 3

[0027] Repeat the process of example 1, just the reducing medium of catalyzer adopts hydrogen. The reduction temperature is 200-475°C, and the reduction time is 4-5 hours.

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Abstract

The preparation method of catalyst for synthesizing ammonia includes the following steps: firstly, using ruthenium trifluoride solution with a certain concentration and adopting conventional wte impregnation method or coating method to impregnate the dried commercial active carbon carrier; drying at 30-120 deg.c; using dilute reducing agent solution to make reduction; using dilute alkaline solution to wash and using pure water to wash, drying at 30-120 deg.c; using conventional wet impregnation method or coating method to impregnate alkaline soil, rare earth or alkali metal solution as adjuvant; finally drying at 30-120 deg.c. As compared with catalyst prepared by hydrogen reduction process the activity of said invented catalyst can be raised by 5-30%.

Description

Technical field: [0001] The invention relates to a preparation method of a novel highly active ammonia synthesis catalyst which uses noble metal ruthenium as an active component, alkaline earth / rare earth / alkali metal oxides or / and hydroxides as auxiliary agents, and commercially available activated carbon (AC) as a carrier. To be precise, it belongs to a preparation method of a metal catalyst. Background technique: [0002] According to the retrieval, the US Patent No. 4142993 describes a preparation route of a ruthenium catalyst for synthesis of ammonia: the carbon carrier is first impregnated with an auxiliary agent, then vacuum roasted, then impregnated with ruthenium trichloride, and then subjected to vacuum roasting to prepare the catalyst. Its preparation process is loaded down with trivial details, and the preparation device is rare, and it is relatively difficult to industrialize. In the catalyst preparation method described in U.S. Patent No. 3,830,753, the auxili...

Claims

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Application Information

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IPC IPC(8): B01J23/46
Inventor 王榕林建新俞秀金魏可镁
Owner FUZHOU UNIVERSITY
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