Preparation method of high-dispersion nano cluster vanadium catalyst

A nano-cluster and catalyst technology, applied in the field of preparation of highly dispersed nano-cluster vanadium catalyst, can solve the problems of low catalytic activity, large cluster particles of active components, poor thermal stability and the like

CN112808262AActive Publication Date: 2021-05-18贵州威顿催化技术有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2021-05-18
Patent Text Reader

Abstract

The invention discloses a preparation method of a high-dispersion nano cluster vanadium catalyst, which comprises the following steps: dissolving vanadium pentoxide solid in 98% concentrated sulfuric acid, and heating and stirring to fully dissolve the vanadium pentoxide solid; adding oxalic acid solid, and fully reacting to convert the oxalic acid solid into a vanadyl sulfate solution; adding nano scale silicon dioxide powder and distilled water, and stirring at a constant temperature, so that the nano scale silicon dioxide powder and the distilled water are fully mixed with the vanadyl sulfate solution; adding sodium sulfate, potassium sulfate, potassium pyrosulfate and cesium sulfate, fully dissolving the alkali metal salt to obtain catalyst slurry, pouring the catalyst slurry into diatomite, fully mixing and dispersing the catalyst slurry in the diatomite, molding, and drying until the moisture is less than 10% to obtain a catalyst semi-finished product; and roasting in a muffle furnace at the temperature of 550-650 DEG C for 45 minutes to obtain the vanadium catalyst. The catalyst has high activity and high thermal stability, and can effectively reduce the emission of sulfur dioxide in tail gas and reduce air pollution.
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Description

technical field

[0001] The invention belongs to the technical field of chemical industry, and in particular relates to a preparation method of a highly dispersed nano-cluster vanadium catalyst. Background technique

[0002] Sulfuric acid is an important chemical raw material, and its output is an important indicator to measure a country's industrial development level. It is widely used in metal smelting, petrochemical, fertilizer production, aerospace and other fields. At present, the annual output of sulfuric acid in my country is about 110 million tons, mainly sulfuric acid, flue gas and pyrite. The key to producing sulfuric acid by these contact methods is to convert sulfur dioxide in the converter under the action of a catalyst Catalytic oxidation with oxygen in the air to sulfur trioxide. Among them, the most representative catalyst is vanadium catalyst, which is a multi-component vanadium catalytic system with vanadium pentoxide as active component, alkali metal sulf...

Examples

Embodiment 1

[0016] A preparation method of a highly dispersed nano-cluster vanadium catalyst, specifically comprising the following steps:

[0017] (1) Dissolve 4.8 kg of vanadium pentoxide solid in 9 kg of 98% concentrated sulfuric acid, heat up to 70~80°C, and stir mechanically for 30 minutes to fully dissolve;

[0018] (2) Add 2.4 kg of oxalic acid solid, control the temperature in the range of 70-80°C, and stir mechanically for 60 minutes to make it fully react and transform into vanadyl sulfate solution;

[0019] (3) Add 12.0 kg of nano-sized silica powder and 28.0 kg of distilled water, control the temperature at 70-80°C, and stir mechanically for 30 minutes to fully mix it with the vanadyl sulfate solution;

[0020] (4) Add 3.0 kg of sodium sulfate and 12.0 kg of potassium sulfate, and mechanically stir for 60 minutes at a temperature of 70-80°C to fully dissolve the alkali metal salt to obtain a catalyst slurry;

[0021] (5) Pour the catalyst slurry into 28.2 kg of diatomite, and...

Embodiment 2

[0025] A preparation method of a highly dispersed nano-cluster vanadium catalyst, specifically comprising the following steps:

[0026] (1) Dissolve 4.8 kg of vanadium pentoxide solid in 9 kg of 98% concentrated sulfuric acid, raise the temperature to 70~80°C, and mechanically stir for 30 minutes to fully dissolve;

[0027] (2) Add 2.4 kg of oxalic acid solid, control the temperature in the range of 70-80°C, and stir mechanically for 60 minutes to make it fully react and transform into vanadyl sulfate solution;

[0028] (3) Add 12.0 kg of nano-sized silica powder and 28.0 kg of distilled water, control the temperature at 70-80°C, and stir mechanically for 30 minutes to fully mix it with the vanadyl sulfate solution;

[0029] (4) Add 3.0 kg of sodium sulfate and 20.4 kg of potassium pyrosulfate, and mechanically stir for 60 minutes at a temperature of 70-80°C to fully dissolve the alkali metal salt to obtain a catalyst slurry;

[0030] (5) Pour the catalyst slurry into 19.8 kg...

Embodiment 3

[0034] A preparation method of a highly dispersed nano-cluster vanadium catalyst, specifically comprising the following steps:

[0035] (1) Dissolve 3.6 kg of vanadium pentoxide solid in 6 kg of 98% concentrated sulfuric acid, heat up to 70~80°C, and stir mechanically for 30 minutes to fully dissolve;

[0036] (2) Add 1.8 kg of oxalic acid solid, control the temperature in the range of 70-80°C, and stir mechanically for 60 minutes to make it fully react and transform into vanadyl sulfate solution;

[0037] (3) Add 9.0 kg of nano-sized silica powder and 21.0 kg of distilled water, and mechanically stir for 30 min at a temperature of 70-80°C to fully mix it with the vanadyl sulfate solution;

[0038] (4) Add 1.8 kg of sodium sulfate, 6.0 kg of potassium sulfate, and 4.8 kg of cesium sulfate, and mechanically stir for 60 minutes at a temperature of 70-80°C to fully dissolve the alkali metal salt to obtain a catalyst slurry;

[0039] (5) Pour the catalyst slurry into 39.6 kg of d...