Ruthenium-based ammonia synthesis catalyst with nitrogen-doped activated carbon as carrier and preparation method thereof

Abstract

The invention discloses a ruthenium-based ammonia synthesis catalyst adopting nitrogen doped activated carbon as a carrier and a preparation method thereof. A precursor of a nitrogen source of nitrogen doped activated carbon is melamine, the nitrogen doping amount is 0.72% to 7.61%, and the nitrogen source comprises the following main components by content: 1% to 15% of graphite nitrogen, 25% to 35% of pyridine nitrogen and 55% to 70% of pyrrole nitrogen. The preparation method comprises the steps of pretreatment of activated carbon, preparation of nitrogen doped activated carbon, preparation of an impregnation precursor solution, and preparation of the catalyst. According to the catalyst prepared through the method, the activity is high, the stability is good, the implementation is easy, and industrial popularization and utilization are facilitated.

Description

technical field [0001] The invention relates to the field of ammonia synthesis catalysts, in particular to a ruthenium-based ammonia synthesis catalyst with nitrogen-doped activated carbon as a carrier and a preparation method thereof. Background technique [0002] The ammonia synthesis industry has always been a pillar industry of the national economy, and the design and research of ammonia synthesis catalysts has always been a hot topic in catalytic chemistry research. In November 1992, the graphitized activated carbon-supported ruthenium-based ammonia synthesis catalyst and its process (KAAP) were jointly developed by BP Company of the United Kingdom and Kellogg Company of the United States, and industrialized for the first time in the Ocelot ammonia synthesis plant in Canada. Compared with traditional iron-based catalysts, ruthenium is more active. In the wave of building an environment-friendly and resource-saving society, ruthenium-based ammonia synthesis catalysts ha...

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Problems solved by technology

[0003] In recent years, with the development of carbon materials, many new composite carbon materials have been derived, and the research on the modification and modification of the surface of carbon materials is also advancing steadily. Among them, nitrogen-doped carbon materials have emerged in the fields of electrochemistry and sensors. The patent No. CN104785255A reports a ruthenium-based ammonia synthesis catalyst using urea as a nitrogen source. The specific surface area of ​​its preparation is low, and its activity is not as high as that of the present invention; secondly, the nitrogen prepared by this method has an indeterminate form , uncontrollable functional groups and other disadvantages