Active carbon loading ruthenium ammonia synthesis catalyst and preparation method thereof

Abstract

The invention discloses an active carbon-loaded ruthenium ammonia-synthesis catalyst and a preparation method thereof, pertaining to catalysts for fertilizers. The active carbon-loaded ruthenium ammonia-synthesis catalyst takes active carbon as a carrier, metal ruthenium as an active ingredient, and alkali metal and alkaline-earth metal as auxiliary agents, the active ingredient, namely, ruthenium, is loaded on the carrier, that is, the active carbon, in the form of Ru(OH)4 or RuO2.2H2O, and the load is calculated by Ru, with the weight of the active ingredient being 2 percent to 9 percent of the weight of the active carbon; the alkaline-earth metal is loaded on the carrier (the active carbon) in the form of a nitrate or an oxalate, and the loaded quantity is calculated by the alkaline-earth metal, with the mass ratio between the alkaline-earth metal and the ruthenium being 0.3-5:1 and the amount-of-substance ration between the alkali metal and the ruthenium being 2-10. The method is quick and simple for operation, and the prepared catalyst has stable performance and high activity and is applicable to industrial production.

Description

technical field [0001] The invention relates to a novel ammonia synthesis catalyst using hydrogen and nitrogen to synthesize ammonia in the ammonia synthesis industry in the field of chemical fertilizers and a preparation method thereof, in particular to an activated carbon-supported ruthenium-based ammonia synthesis catalyst and a preparation method thereof. Background technique [0002] The ruthenium-based ammonia synthesis catalyst supported by activated carbon is usually prepared by impregnation method, and the active components and cocatalysts are impregnated step by step. Usually the active components are reduced by hydrogen (such as Chinese patents CN1621148A, CN1270081A, etc.). Chinese patent CN1385238A uses hydrazine hydrate instead of hydrogen for reduction, but the treatment of ammonia-containing waste liquid after reduction is very troublesome. Chinese patent CN101053834A discloses that the RuCl 3 Take Ru(OH) 3 The preparation technology of the supported ruthe...

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Problems solved by technology

Chinese patent CN1385238A uses hydrazine hydrate instead of hydrogen for reduction, but the treatment of ammonia-containing waste liquid after reduction is very troublesome

However, since from Ru 3+ Precipitate to get Ru(OH) 3 The reaction speed is slow, and it takes 2 to 30 hours at room temperature to 100°C, and soluble Ru 3+ It is difficult for the salt to deposit completely and uniformly on the surface of the carrier, resulting in uneven distribution of ruthenium content on the activated carbon carrier, and the preparation process is easy to cause part of the ruthenium loss, so it is difficult to ensure the quality consistency of catalysts prepared in different batches, and at the same time, the precipitation time is relatively long. Q greatly affects the production efficiency of the catalyst

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