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Catalyst for synthesizing ammonia through activated-carbon-loading ruthenium, and preparation method thereof

The technology of activated carbon and catalyst is applied in the field of preparation of activated carbon-supported ruthenium ammonia synthesis catalyst, which can solve the problems of high catalyst cost and hinder the popularization and use of catalyst, and achieve the effect of low content of precious metal ruthenium and high degree of dispersion.

Active Publication Date: 2009-11-18
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But, the ruthenium consumption of this catalyzer is about 8-20wt% (based on gac carrier weight), and such high ruthenium consumption makes the cost of catalyzer remain high, has seriously hindered the popularization and use of catalyzer

Method used

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  • Catalyst for synthesizing ammonia through activated-carbon-loading ruthenium, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Take 500 grams of BET specific surface area is 1250m 2 / g short cylindrical coconut shell charcoal with a length of about 3-15mm, washed with water at room temperature and dried at 80-120°C to remove water, then placed in a high-temperature furnace, and treated at 1800-1900°C for 2 hours under the protection of an inert gas. After the temperature was lowered to room temperature, it was taken out and placed in a hole reaming furnace, fed with oxygen, CO 2 The mixed gas composed of nitrogen, nitrogen and water vapor was treated at 460°C for 16 hours and then cooled to room temperature for use. The resulting shaped carbon has a compressive strength ≥ 90N / cm (cylindrical), a wear rate ≤ 0.4%, and a BET specific surface area of ​​1000m 2 / g.

[0013] Get 100g of the above-mentioned activated carbon carrier, and use Ba(NO 3 ) 2 , Mg(NO 3 ) 2 , La 2 (NO 3 ) 3 aqueous solution (or three salt mixture aqueous solutions at the same time) for impregnation. Based on the we...

Embodiment 2

[0018] Example 1 was repeated except that ethanol was used as the solvent for the KOH when impregnating the KOH. Based on the weight of the activated carbon carrier, the composition of the catalyst is: Ru: 4.5%, Ba: 4%, Mg: 1.4%, La: 0.1%, K: 17%. The determination method and conditions of the physical and chemical parameters of the catalyst are the same as in Example 1, and the mechanical strength and ammonia synthesis activity of the catalyst are shown in Table 1.

Embodiment 3

[0019] Embodiment 3 (comparative example)

[0020] Repeat embodiment 1, just auxiliary agent composition does not contain magnesium and rare earth. Based on the weight of the active carbon carrier, the composition of the catalyst is: Ru: 4.5%, Ba: 4%, K: 17%. The determination method and conditions of the physical and chemical parameters of the catalyst are the same as in Example 1, and the mechanical strength and ammonia synthesis activity of the catalyst are shown in Table 1.

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Abstract

The invention relates to a catalyst for synthesizing ammonia through activated-carbon-loading ruthenium, and a preparation method thereof. The method comprises: adopting activated carbon subjected to high-temperature treatment and oxidizing-reaming treatment as a carrier; using Ba (NO3)2, Mg (NO3)2, and Ln (NO3)3 aqueous solution to modify the activated carbon carrier by an impregnation method according to the molar ratio of Ba to Mg to Ln being 1:1-3:0.01-1, wherein Ln is a mixture of one or more than two of La, Pr, Nd and Sm; plating the carrier with RuCl3 by the impregnation method; using hydrogen or hydrogen-nitrogen mixed gas to reduce the RuCl3 into metallic ruthenium at a temperature of between 110 and 470 DEG C; and plating the obtained product with KNO3, K2CO3 or KOH additives by the impregnation method. Based on the weight of the activated carbon carrier, the catalyst consists of 2 to 7 weight percent of Ru, 3 to 8 weight percent of Ba+Mg+Ln, and 6 to 18 weight percent of K. The catalyst is applicable to synthesizing ammonia from hydrogen and nitrogen under the reaction pressure of between 5 and 20 MPa at a reaction temperature of between 230 and 475 DEG C.

Description

technical field [0001] The invention relates to a method for preparing an activated carbon-supported ruthenium ammonia synthesis catalyst used in ammonia synthesis industry to synthesize ammonia from hydrogen and nitrogen. Background technique [0002] The traditional molten iron ammonia synthesis catalyst has been used in the ammonia synthesis industry for more than 90 years. Although iron catalysts have the advantages of low price and good stability, when iron catalysts are used, the ammonia synthesis reaction must be carried out under high temperature and high pressure conditions, and the production process requires harsh equipment, large investment, and high energy consumption. [0003] In recent years, foreign countries have successfully developed a dual-assistant activated carbon-supported ruthenium-based ammonia synthesis catalyst with Ba, Cs or Ba, K as additives, which can convert H 2 , N 2 It catalyzes the synthesis of ammonia, so it has a significant effect of s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63C01B21/087
Inventor 王榕孔繁华张天釜张春光林建新魏可镁
Owner PETROCHINA CO LTD
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