Copper-manganese base high temperature transformation catalyst and preparation method thereof

Abstract

The present invention discloses one kind of Cu-Mn base high temperature conversion catalyst and its preparation process. The catalyst has the general expression of CuaMnbO4-M, where an is 1.0-1.5, b is 1.5-2.0, CuaMnbO4 is the active component and accounts for 95-98 wt%, and M is the heat stabilizing assistant and accounts for 2-5 wt%. The preparation process of the catalyst includes compounding water solution containing Cu and Mn, preparing precursor for the catalyst, preparing mixed Cu-Mn precipitate, preparing Cu-Mn base catalyst and other steps. The said process is simple and low in cost, and the preparation catalyst has high heat resistance and high low temperature activity.

Description

technical field [0001] The invention relates to a high-temperature shift catalyst, in particular to a copper-manganese-based high-temperature shift catalyst and a preparation method thereof. Background technique [0002] The CO shift reaction plays an important role in hydrogen production and purification of synthesis gas. Since the industrial application of this reaction in 1921, iron-chromium-based high-temperature shift catalysts have been playing an important role. This type of catalyst has the advantages of wide active temperature, good thermal stability, and strong anti-toxic performance. Its basic composition has changed little over the years. However, except that there is environmental pollution in iron-chromium series catalysts, the main technical problem in use is that a large amount of excess water vapor is needed to prevent the active components (Fe 3 o 4 ) is excessively reduced, resulting in a reduction in catalyst activity, and more seriously, a series of si...

AI Technical Summary

Problems solved by technology

However, except that there is environmental pollution in iron-chromium series catalysts, the main technical problem in use is that a large amount of excess water vapor is needed to prevent the active components (Fe 3 o 4 ) is excessively reduced, resulting in a reduction in catalyst activity, and more seriously, a series of side reactions such as Fischer-Tropsh (Fischer-Tropsch reaction) occur, so that it cannot meet the requirements of new energy-saving processes

Even the improved iron-chromium high-temperature shift catalyst has a certain limit to the ability to resist the side reaction of Fischer-Tropsh (Fischer-Tropsch reaction). 2 O / CO) will still produce a large amount of F-T side reaction products under the lower conditions, causing a series of serious consequences, such as the reduction of hydrogen production, the poisoning of low shift catalyst, the deterioration of operating state, etc., so the elimination of Fischer-Tropsh side reaction The fundamental approach is to develop iron-free catalysts

[0003] The earliest reports on the research of non-iron-based high-temperature shift catalysts to overcome the problem of Fischer-Tropsh side reactions in iron-based high-temperature shift catalysts are the Cu-based shift catalysts LK-811 and KK142 reported by Topsoe, Denmark. The highest heat-resistant temperature is about 350°C-390°C, although it is much higher than the heat-resistant temperature of Cu-Zn low-temperature shift catalyst (250°C), but compared with the heat-resistant temperature of iron-based high-temperature shift catalyst (480-500°C), There is still a certain gap in its heat resistance

Images