Preparation method of graphitized activated carbon carrier

Abstract

The invention discloses a preparation technology of a carrier for preparing a novel ammonia synthesis catalyst in the synthetic ammonia industry, and concretely relates to a preparation method of a graphitized activated carbon carrier. Industrial graphitized activated carbon is pre-oxidized with nitric acid under certain conditions, and then undergoes heat treatment to rapidly obtain the activatedcarbon carrier with a high specific surface. The preparation method, adopting the heat treatment after the pre-oxidation using nitric acid, can greatly reduce the treatment temperature and shorten the treatment time, allows the graphitized activated carbon with the high specific surface to be prepared, and meets high requirements of the industrial activated carbon carrier.

Description

technical field [0001] The invention belongs to the field of preparation of graphitized activated carbon materials, and in particular relates to a preparation method of graphitized activated carbon carrier. technical background [0002] Ruthenium-based ammonia synthesis catalyst as a supported catalyst, the interaction between the carrier and the catalyst has a direct impact on the activity of the catalyst. Some hard requirements of the carrier. [0003] At present, the activated carbon used in industry is carbon that has undergone high-temperature graphitization and subsequent pore expansion treatment, which has good electrical conductivity and stable structure. According to the current patent reports, the method of patent CN102442665A pre-adding pore-enlarging agent is graphitized activated carbon. The pore-enlarging agent is alkali, hydrochloride or phosphoric acid. Impurity ions are easy to remain in the medium; patent CN 104071786 A discloses a preparation method of a...

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Problems solved by technology

According to the current patent reports, the method of patent CN102442665A pre-adding pore-enlarging agent is graphitized activated carbon. The pore-enlarging agent is alkali, hydrochloride or phosphoric acid. Impurity ions are easy to remain in the medium; patent CN 104071786 A discloses a preparation method of adding a pore-enlarging agent to activated carbon and treating it under an inert atmosphere at 500 ℃ to 1000 ℃ to obtain a high specific surface area, but due to its high processing temperature and high atmosphere requirements , which is not conducive to industrial mass production. At the same time, the dilute acid used is used to wash the residual metal salt or its oxide after the hole is expanded. The preparation route is long and the energy consumption is high.

Patent CN 1382527 A discloses a method of expanding the pores of high-temperature graphitized activated carbon to restore high specific surface and pore volume. Compared with surface activated carbon, graphitized activated carbon does not add a pore expander before expanding the pores, and does not perform other activation treatments. To achieve a suitable pore structure, it takes a long time for pore expansion and high energy consumption.

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