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A kind of ruthenium series ammonia synthesis catalyst and preparation method thereof

A kind of ammonia synthesis and catalyst technology, which is applied in the direction of ammonia preparation/separation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of low ammonia synthesis activity and poor stability of ruthenium-based ammonia synthesis catalysts, etc. Effects of synthetic activity, resistance to methanation, and high heat resistance

Active Publication Date: 2019-09-03
FUZHOU UNIV ASSET MANAGEMENT CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] For this reason, the existing ruthenium-based ammonia synthesis catalyst to be solved has the disadvantages of poor stability and low ammonia synthesis activity, and then provides a ruthenium catalyst with good stability, high ammonia synthesis activity, high dispersion of ruthenium metal, and good toxicity resistance. Ammonia synthesis catalyst and preparation method thereof

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  • A kind of ruthenium series ammonia synthesis catalyst and preparation method thereof
  • A kind of ruthenium series ammonia synthesis catalyst and preparation method thereof
  • A kind of ruthenium series ammonia synthesis catalyst and preparation method thereof

Examples

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Embodiment 1

[0037] This embodiment provides a ruthenium-based ammonia synthesis catalyst and a preparation method thereof. The ruthenium-based ammonia synthesis catalyst consists of 5g of ruthenium, 5g of magnesium oxide, 80g of activated carbon, 7g of cerium oxide, 1.5g of molybdenum oxide and 1.5g of tungsten oxide;

[0038] The preparation method of above-mentioned ruthenium series ammonia synthesis catalyst comprises the steps:

[0039] 1) Mix basic magnesium carbonate, activated carbon, basic cerium carbonate, molybdenum oxide and tungsten oxide ball mill, collect a mixture with a particle size of 0.1mm, and add a binder-epoxy resin to the mixture for molding, get moldings;

[0040] 2) Immerse the molded product in equal volumes in an aqueous solution of potassium ruthenate with a mass fraction of 12%, control the temperature of the immersion to 25° C., and take it out after the immersion is completed;

[0041] 3) Reducing the impregnated molded product in hydrogen, controlling the...

Embodiment 2

[0044] This embodiment provides a ruthenium-based ammonia synthesis catalyst and a preparation method thereof. The ruthenium-based ammonia synthesis catalyst consists of 2g of ruthenium, 8g of magnesium oxide, 70g of activated carbon, 3g of cerium oxide, 2g of molybdenum oxide and 1g of tungsten oxide;

[0045] The preparation method of above-mentioned ruthenium series ammonia synthesis catalyst comprises the steps:

[0046] 1) Mix basic magnesium carbonate, activated carbon, basic cerium carbonate, molybdenum oxide and tungsten oxide by ball milling, collect a mixture with a particle size of 0.05mm, and shape the mixture to obtain a molded product;

[0047] 2) Immerse the molded product in an equal volume in an aqueous solution of sodium ruthenate with a mass fraction of 8%, control the temperature of the immersion to 40° C., and take it out after the immersion is completed;

[0048]3) Reducing the impregnated molded product in hydrogen, controlling the reduction temperature...

Embodiment 3

[0051] This embodiment provides a ruthenium-based ammonia synthesis catalyst and a preparation method thereof. The ruthenium-based ammonia synthesis catalyst consists of 8g of ruthenium, 2g of magnesium oxide, 85g of gac, 3g of cerium oxide, 1g of molybdenum oxide and 2g of tungsten oxide;

[0052] The preparation method of above-mentioned ruthenium series ammonia synthesis catalyst comprises the steps:

[0053] 1) Mix basic magnesium carbonate, activated carbon, basic cerium carbonate, molybdenum oxide and tungsten oxide by ball milling, collect a mixture with a particle size of 0.5 mm, and shape the mixture to obtain a molded product;

[0054] 2) Immerse the molded product in equal volumes in an aqueous solution of potassium ruthenate with a mass fraction of 15%, control the temperature of the immersion to 10° C., and take it out after the immersion is completed;

[0055] 3) Reducing the impregnated molded product in hydrogen, controlling the reduction temperature to 400°C ...

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Abstract

The invention discloses a ruthenium-based ammonia synthesis catalyst and a preparation method thereof. The catalyst comprises the following components by weight: 2-8 parts of ruthenium, 2-8 parts of magnesium oxide, 70-85 parts of activated carbon, 3-10 parts of cerium oxide, 1-2 parts of molybdenum oxide and 1-2 parts 2 parts of tungsten oxide. The preparation method adopts specific raw materials and specific roasting temperature to prepare the ruthenium series ammonia synthesis catalyst. The catalyst has good stability, high ammonia synthesis activity, high dispersion degree of ruthenium metal and good toxicity resistance, and can be widely used in ammonia synthesis process.

Description

technical field [0001] The invention belongs to the technical field of ammonia synthesis catalyst preparation, and in particular relates to a ruthenium-based ammonia synthesis catalyst and a preparation method thereof. Background technique [0002] The ruthenium catalyst has the characteristics of low temperature, low pressure and high activity, and is known as the second-generation ammonia synthesis catalyst after the molten iron catalyst. It usually consists of three parts: carrier, active metal ruthenium, and auxiliary agent. Among them, the carrier usually adopts activated carbon, graphitized activated carbon, graphite, metal oxide, etc. Activated carbon, graphitized activated carbon, or graphite-based ruthenium-based ammonia synthesis catalysts have high ammonia synthesis activity, but in the presence of ruthenium, carbon can undergo methanation reaction with hydrogen, one of the reactants for ammonia synthesis, resulting in the loss of the carrier. The structure colla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/652B01J27/24C01C1/04
Inventor 江莉龙林建新倪军林炳裕林科
Owner FUZHOU UNIV ASSET MANAGEMENT CO LTD
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