Preparation method of high-dispersion nano cluster vanadium catalyst

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.

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...

AI Technical Summary

Problems solved by technology

The preparation method adopts solid-solid mixing, and there are problems such as uneven distribution of active components and large particles of active component clusters. Therefore, the vanadium catalyst prepared by this method has low compressive strength, poor thermal stability, and low catalytic activity.