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High-activity catalyst for ammonia synthesis and preparation method thereof

A high-activity catalyst and ammonia synthesis technology, applied in the direction of ammonia preparation/separation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems affecting the catalytic effect of active metals, and achieve good industrial application prospects and good ammonia The effect of synthetic properties

Active Publication Date: 2020-12-11
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the preparation process of the existing ruthenium-cobalt bimetallic catalysts, two active metal precursors are usually mixed and added to the support, and the difference in the interaction between the two metals and the support will affect the catalytic effect of the active metal.

Method used

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  • High-activity catalyst for ammonia synthesis and preparation method thereof
  • High-activity catalyst for ammonia synthesis and preparation method thereof
  • High-activity catalyst for ammonia synthesis and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Mix and dissolve 2.538 g cerium acetate and 23 mg cobalt nitrate in 20 mL deionized water to form a mixed solution, and dissolve 38.4 g NaOH in 140 mL distilled water to form an alkaline solution; The solid solution was obtained after hydrothermal reaction for 6 hours; the solid solution was washed to neutrality, dried at 100 °C overnight, and calcined at 400 °C for 1 hour, and the obtained sample was impregnated with 10 g / L carbonyl ruthenium alcohol solution for 3 hours; then in H2 volume concentration of 10% 2 -Ar mixed gas, after reduction at 600 °C for 4 hours, the catalyst 1RuCo 0.1 / Ce, calculated based on the mass of cerium oxide, the addition amounts of ruthenium metal and cobalt metal in the catalyst are 1% and 0.1%, respectively.

Embodiment 2

[0026] Take 1.736 g of cerium nitrate and 2.6 mg of cobalt chloride and mix and dissolve in 30 mL of deionized water to form a mixed solution, and dissolve 20 g of KOH in 60 mL of distilled water to form an alkaline solution; A solid solution was obtained after a hydrothermal reaction at 100 °C for 24 hours; the solid solution was washed to neutrality, dried at 80 °C for 2 hours, and calcined at 550 °C for 2 hours, and the obtained sample was treated with 15 g / L nitrosyl nitrate Ruthenium alcohol solution was soaked for 2 hours; then the catalyst 0.5RuCo was obtained after reduction with pure hydrogen at 500 °C for 2 hours 0.15 / Ce, based on the mass of cerium oxide, the addition amounts of ruthenium metal and cobalt metal in the catalyst are 0.5% and 0.15%, respectively.

Embodiment 3

[0028] Mix and dissolve 3.472 g cerium nitrate and 2.3 mg cobalt nitrate in 40 mL deionized water to form a mixed solution, and dissolve 38.4 g NaOH in 140 mL distilled water to form an alkaline solution; A solid solution was obtained after thermal reaction for 24 hours; the solid solution was washed to neutrality, dried at 80 °C for 2 hours, and calcined at 550 °C for 2 hours, and the obtained sample was impregnated with 5 g / L ruthenium chloride alcohol solution for 2 hours; then at 10% H 2 -3.3% N 2 Catalyst 0.5RuCo 0.05 / Ce, based on the mass of cerium oxide, the addition amounts of ruthenium metal and cobalt metal in the catalyst are 0.5% and 0.05%, respectively.

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Abstract

The invention discloses a high-activity catalyst for ammonia synthesis and a preparation method thereof, which comprises the following steps: growing cobalt on a cerium oxide carrier in situ, and introducing ruthenium, thereby preparing the high-activity catalyst for ammonia synthesis by using ruthenium and cobalt double metals as active components, specifically, dissolving a cerium precursor anda cobalt precursor in water in a mixing way, uniformly mixing and stirring a cerium precursor and a cobalt precursor and an alkaline solution, carrying out hydrothermal reaction to obtain a solid solution, performing washing, drying and calcining, impregnating the obtained sample with a ruthenium precursor solution, and finally performing reducing to obtain the catalyst. The catalyst obtained by the invention has higher ammonia synthesis activity and better application prospect.

Description

technical field [0001] The invention belongs to the technical field of ammonia synthesis catalysts, and in particular relates to a highly active catalyst for ammonia synthesis and a preparation method thereof. Background technique [0002] Ammonia is an important chemical intermediate in the production of agricultural fertilizers, plastics, pharmaceuticals, explosives and other chemicals. Ammonia is an almost ideal hydrogen storage material due to its appreciable hydrogen capacity of 17.6 wt% and its easy condensation into a liquid state for storage or transportation. At the same time, 4.3 kWh h –1 The high energy density and zero carbon emissions make ammonia an ideal energy carrier and even a substitute for hydrogen in the future energy economy. Therefore, the importance of ammonia in the field of new energy has become increasingly significant, and the development of ammonia synthesis methods that are beneficial to the environment has attracted widespread attention. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89C01C1/04
CPCB01J23/8913C01C1/0411Y02P20/52
Inventor 林炳裕李春艳江莉龙林建新倪军
Owner FUZHOU UNIV
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