Preparation method of active carbon-supported ruthenium-based ammonia synthesis catalyst

Abstract

The invention discloses a preparation method of an active carbon-supported ruthenium-based ammonia synthesis catalyst, and belongs to a preparation method of a novel ammonia synthesis catalyst for synthesizing ammonia by hydrogen and nitrogen in ammonia synthesis industry in the fertilizer field. The preparation method is characterized in that nitro diammino ruthenium dioxide (RO2(NH3)2(NO3)2) is used as a metal ruthenium precursor; nitrates of alkali metal and alkaline earth metal are used as auxiliary agents ; active carbon is used as a carrier; and the active carbon-supported ruthenium-based ammonia synthesis catalyst is realized by an impregnation method. The active carbon-supported ruthenium-based catalyst prepared by the method of the invention does not contain chloride ions, does not need procedures of reduction or precipitation, has uniform distribution of active components and the auxiliary agents on the catalyst, and has no ruthenium loss in the preparation process. The method of the invention is simple and rapid in operation, and the prepared catalyst is stable in performance, high in activity, and suitable for industrial production.

Description

Technical field [0001] The invention relates to a method for preparing a novel ammonia synthesis catalyst using hydrogen and nitrogen to synthesize ammonia in the synthetic ammonia industry, belonging to the field of chemical fertilizers, and specifically to a method for preparing an activated carbon-supported ruthenium-based ammonia synthesis catalyst. Background technique [0002] The ruthenium-based ammonia synthesis catalyst with activated carbon as the carrier usually adopts special activated carbon as the carrier, ruthenium trichloride as the ruthenium precursor, alkali metals and alkaline earth metals as assistants, and the active components and promoters are stepped by the impregnation method. Dipping. Since the chlorine-containing ruthenium metal salt is used as the ruthenium precursor, the ruthenium salt usually adopts hydrogen reduction methods (such as Chinese patents CN1621148A, CN1270081A, etc.), or uses hydrazine hydrate to replace hydrogen for reduction (such as C...

AI Technical Summary

Problems solved by technology

However, chlorine ions usually remain in the catalyst prepared by hydrogen reduction, which will have a certain impact on the performance and life of the catalyst

For ruthenium catalysts that are reduced with a reducing aqueous solution or prepared by precipitation, the subsequent chlorine washing process must be added to clean the residual chlorine in the catalyst, and the longer washing time greatly affects the production efficiency of the catalyst

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