Preparation method of chloride-free activated carbon-loaded ruthenium-based ammonia synthesis catalyst

Abstract

The invention relates to a preparation method of a chloride-free activated carbon-loaded ruthenium-based ammonia synthesis catalyst, and relates to a preparation method of a chloride-free ruthenium-based ammonia synthesis catalyst by using ruthenium chloride as a raw material and removing chloride ions. The preparation method specifically comprises the following steps of using the ruthenium chloride as the raw material, adding soluble alkaline, standing, settling, washing, and dissolving, so as to obtain a chloride-free ruthenium precursor; loading onto the activated carbon, and adding a KNO3(potassium nitrate) additive, so as to obtain the chloride-free activated carbon-loaded ruthenium-based ammonia synthesis catalyst. Compared with the ruthenium-based ammonia synthesis catalyst prepared the existing methods, the preparation method has the advantages that the ruthenium chloride is used as the raw material, the price is low, the preparation technology is simple, the operation is convenient, the chloride ions can be well removed, and the loss of noble metal, namely ruthenium, is reduced in the preparation process; the activity of the prepared catalyst is higher; the industrializedapplication prospect is better.

Description

Technical field [0001] The invention relates to a preparation technology of a ruthenium catalyst using nitrogen and hydrogen to synthesize ammonia in the synthetic ammonia industry in the chemical fertilizer field, and specifically relates to a preparation method of a chlorine-free activated carbon supported ruthenium-based ammonia synthesis catalyst. Background technique [0002] The synthetic ammonia industry occupies a pivotal position in the national economy. A large part of synthetic ammonia is used as nitrogen fertilizer, which promotes grain production. In addition, ammonia is also an indispensable and important raw material in many chemical production. Therefore, the invention and development of synthetic ammonia technology are of great significance to mankind. Currently, the commonly used ammonia synthesis catalyst precursors are divided into two types, chlorine-containing compounds and chlorine-free compounds. For example, hydrated ruthenium trichloride is a more comm...

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Problems solved by technology

However, first loading ruthenium chloride on the carrier, and then washing with water to remove chloride ions, some ruthenium will be lost during the washing process. After loading and washing, the maximum loss of ruthenium may reach 10%, which is a huge loss for precious metals. waste, and the method of washing before loading is used, there is almost no loss of ruthenium in the catalyst preparation process, the economic benefit is remarkable, the activity and stability of the catalyst can also be stably controlled, and the quality of the catalyst product is more controllable; moreover, due to the The chloride ions on the surface of activated carbon and the hydroxyl, carboxyl and other groups on the surface of activated carbon have a strong bonding strength, which makes the washing time of the loaded chloride ions very long, and it is difficult to completely wash away the chloride ions, which leads to the use of chloride ions on the catalyst in industrial high-temperature and high-pressure equipment. pose a greater security risk

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