Copper-filled carbon monoxide medium temperature shift catalyst and preparation method thereof

Abstract

The invention relates to a copper-filled carbon monoxide medium temperature shift catalyst and a preparation method thereof. The catalyst is prepared by the following steps of adopting a sandwich type composition with the chemical formula as Cu3Zn3Al2(OH)164H2O; adopting copper salt, zinc salt and aluminum salt as active components; comprising 25 percent to 50 percent of CuO, 30 percent to 50 percent of ZnO and 10 percent to 40 percent of Al2O3; neutralizing; heat treating; filtration washing; pulping; spray drying; forging; pressing and forming; packaging; and the like. According to the copper-filled carbon monoxide medium temperature shift catalyst and the preparation method thereof provided by the invention, a coprecipitation technique and special equipment are adopted, and the active components are dispersed highly and identical completely, so that the only uniform composite Cu3Zn3Al2(OH)164H2O instead of a mixture of various structure compounds is really formed, and the catalyst has the advantages of high activity and high heat stability; effective copper crystals are dispersed highly, so that the copper crystals are ensured to be small, and the copper surface area is high; in addition, due to the height interval of other active auxiliaries and the structures, the copper crystals of the catalyst are not easy to grow, and have higher heat stability.

Description

technical field [0001] The invention relates to a copper-based carbon monoxide medium-temperature shift catalyst and a preparation method thereof. Background technique [0002] The typical process flow of a hydrogen production unit is refinery gas, or mixed refinery gas such as natural gas and liquefied gas, which is pretreated, hydrogenated, desulfurized, steam reformed, high temperature shift and PSA pressure swing adsorption to obtain hydrogen products. The purity of hydrogen reaches over 99.9%. The hydrogen production devices designed and built in China in recent years are mainly 20,000-60,000 standard meters 3 / hour. At the same time, some large-scale devices and technologies have also been introduced. In 2008, PetroChina Dalian Petrochemical Co., Ltd. built two sets of 100,000 Nm3 / h hydrogen production devices with the technology of Topsoe, Denmark. In 2009, CNOOC built two sets in Huizhou. The 100,000 standard meter 3 / hour hydrogen production device, etc., represe...

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Problems solved by technology

my country's newly introduced 100,000 standard m3 / h hydrogen production unit is designed to be loaded with LK-811 and LK-813, as well as LK-817 and LK-813 medium-change catalyst combinations. The catalyst use conditions and technical indicators are: temperature 200-350°C, pressure 1.5-5MPa, dry basis space velocity 0-3200h-1, CO conversion rate ≥ 80%; the actual operating conditions are: inlet temperature 200°C, outlet temperature 300-310°C, pressure 2.45MPa, dry basis The space velocity is 2000-3000h-1, the inlet CO content is 10-17%, the outlet CO content is 1.5-2.3%, when the load is 78.5%, the H2O / CO ratio is 6.67, and the CO conversion rate is 90.9%. However, this type of catalyst cannot meet the heat resistance at the same time At the same time, the characteristics of low temperature and high activity lead to a decrease in the performance of the catalyst. In addition, the production process of the traditional copper-based carbon monoxide medium temperature shift catalyst will produce a large amount of methanol by-products or a mixture of various structural compounds, which greatly improves the activity and thermal stability of the catalyst. reduce

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