Preparation method of environmentally-friendly low-temperature shift catalyst

Abstract

The invention relates to a preparation method of an environmentally-friendly low-temperature shift catalyst. Through adding an M (K, Rb, Cs, Mg, Sr, Ba and the like) metal element into the existing Cu / Zn / Al catalyst, the purpose of restraining the methanol synthesis side reaction is achieved. The catalyst is characterized in that under the same water / carbon ratio (vapor-air ratio) conditions, after the Cu / Zn / Al / M catalyst is modified by the M, the selectivity of the low-temperature shift catalyst is remarkably improved, the hydrogen output is high, and the contents of alcohol and amine in condensate are lower so as to provide better conditions for condensate recovery and utilization and environment protection.

Description

technical field

[0001] The invention relates to catalysts for various large-scale synthetic ammonia plants and hydrogen production, mainly for converting carbon monoxide in raw material gas into carbon dioxide and hydrogen. Background technique

[0002] At present, the low-temperature shift catalysts used in industry are mainly copper oxide, and the active components after reduction are fine copper crystallites. By adding other additives to the catalyst to effectively separate copper crystallites and improve its stability. Among them, copper, zinc and aluminum have the best performance, low production cost, and non-toxicity.

[0003] The low shift catalyst mainly adopts a new preparation process route to increase the dispersion and distribution of the active components, thereby improving the activity, selectivity and anti-poisoning ability of the catalyst and prolonging the service life. UCI has been continuously improving the performance of its low shift catalysts. The C...

Examples

Embodiment 1

[0019] Weigh 34.00g of zinc and 32.33g of copper respectively, add 171.6g of nitric acid, control the reaction temperature at 80-90°C, and prepare a mixed solution of copper nitrate and zinc nitrate with a certain concentration.

Embodiment 2

[0021] In the mixed solution in embodiment 1, add K 2 ZnO 2 solution, and then add saturated sodium carbonate solution dropwise to neutralize the precipitates of basic copper carbonate, basic zinc carbonate and basic potassium zinc carbonate. After stirring, and then filtering and drying, the mixed material of basic copper carbonate, basic zinc carbonate, basic potassium carbonate and aluminum hydroxide is prepared.

[0022] The dried mixed material is mixed with an appropriate amount of wet filter cake, rolled and mixed evenly, and then granulated and air-dried to remove part of the water. The corresponding oxides are prepared by roasting the dried particles at a high temperature of 450-520°C.

[0023] The oxide obtained by roasting is mixed with 1.33g of graphite, and then formed into a tablet to obtain the finished product.

Embodiment 3

[0025] In the mixed solution in embodiment 1, add Rb 2 ZnO 2 solution, and then add saturated sodium carbonate solution dropwise to neutralize the precipitates of basic copper carbonate, basic zinc carbonate and basic potassium zinc carbonate. Stir, and then filter and dry to prepare basic copper carbonate, basic zinc carbonate, basic rubidium carbonate and aluminum hydroxide mixed material.

[0026] The dried mixed material is mixed with an appropriate amount of wet filter cake, rolled and mixed evenly, and then granulated and air-dried to remove part of the water. The corresponding oxides are prepared by roasting the dried particles at a high temperature of 450-520°C.

[0027] The oxide obtained by roasting is mixed with 1.33g of graphite, and then formed into a tablet to obtain the finished product.

technical field

[0001] The invention relates to catalysts for various large-scale synthetic ammonia plants and hydrogen production, mainly for converting carbon monoxide in raw material gas into carbon dioxide and hydrogen. Background technique

[0002] At present, the low-temperature shift catalysts used in industry are mainly copper oxide, and the active components after reduction are fine copper crystallites. By adding other additives to the catalyst to effectively separate copper crystallites and improve its stability. Among them, copper, zinc and aluminum have the best performance, low production cost, and non-toxicity.

[0003] The low shift catalyst mainly adopts a new preparation process route to increase the dispersion and distribution of the active components, thereby improving the activity, selectivity and anti-poisoning ability of the catalyst and prolonging the service life. UCI has been continuously improving the performance of its low shift catalysts. The C...

Examples

Embodiment 1

[0019] Weigh 34.00g of zinc and 32.33g of copper respectively, add 171.6g of nitric acid, control the reaction temperature at 80-90°C, and prepare a mixed solution of copper nitrate and zinc nitrate with a certain concentration.

Embodiment 2

[0021] In the mixed solution in embodiment 1, add K 2 ZnO 2 solution, and then add saturated sodium carbonate solution dropwise to neutralize the precipitates of basic copper carbonate, basic zinc carbonate and basic potassium zinc carbonate. After stirring, and then filtering and drying, the mixed material of basic copper carbonate, basic zinc carbonate, basic potassium carbonate and aluminum hydroxide is prepared.

[0022] The dried mixed material is mixed with an appropriate amount of wet filter cake, rolled and mixed evenly, and then granulated and air-dried to remove part of the water. The corresponding oxides are prepared by roasting the dried particles at a high temperature of 450-520°C.

[0023] The oxide obtained by roasting is mixed with 1.33g of graphite, and then formed into a tablet to obtain the finished product.

Embodiment 3

[0025] In the mixed solution in embodiment 1, add Rb 2 ZnO 2 solution, and then add saturated sodium carbonate solution dropwise to neutralize the precipitates of basic copper carbonate, basic zinc carbonate and basic potassium zinc carbonate. Stir, and then filter and dry to prepare basic copper carbonate, basic zinc carbonate, basic rubidium carbonate and aluminum hydroxide mixed material.

[0026] The dried mixed material is mixed with an appropriate amount of wet filter cake, rolled and mixed evenly, and then granulated and air-dried to remove part of the water. The corresponding oxides are prepared by roasting the dried particles at a high temperature of 450-520°C.

[0027] The oxide obtained by roasting is mixed with 1.33g of graphite, and then formed into a tablet to obtain the finished product.

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