SO4<2->/ZrO2-Fe2O3-SiO2 doped mixed-crystal solid acid and preparation method thereof

Abstract

The invention discloses a SO4<2-> / ZrO2-Fe2O3-SiO2 doped mixed-crystal solid acid and a preparation method thereof. The preparation method comprises the following steps: (1) dropwisely adding ammonia in an aqueous solution of ZrOCl2, ammonium hexachloroiridate, cobaltous acetate and ammonium molybdate, then adding nano ferric oxide, dispersing, after a spacing interval of 1 hour, adding sodium fluosilicate, preserving the heat, standing, filtering, collecting precipitates, washing the precipitates and drying; and (2) dipping the product obtained by the step (1) in an ammonium chloroplatinate solution, then roasting, dipping the roasted article in a sulfuric acid solution, and then roasting again to obtain the SO4<2-> / ZrO2-Fe2O3-SiO2 doped mixed-crystal solid acid. According to the invention, the strength of the acid can be significantly raised, the acid site amount is stabilized and increased, the reuse effect is good, and the solid acid disclosed herein is an ideal acid catalyst for high-molecular polymerization, addition reaction, cracking reaction, esterification reaction, etherification reaction, etc.

Description

Technical field [0001] The invention relates to a preparation method of solid super acid. Background technique [0002] Solid super acid is a new type of catalyst discovered by humans. Because of its high acidity, it can activate saturated hydrocarbons that are inactive under normal conditions, and can cause various chemical reactions of saturated hydrocarbons. It also overcomes the shortcomings of liquid acids. It has the advantages of easy separation from the reaction system, non-corrosive equipment, environmental friendliness, and reusability, etc., and has attracted more and more attention. In recent years, the research and development of solid superacids has become more and more extensive, but due to the large amount of liquid acid, the acid center It has excellent fluidity, and the amount of solid acid is far inferior to that of liquid acid. The main reason is that the amount of acid is limited. The reason is that the specific surface area of ​​solid acid is low, which limi...

AI Technical Summary

Problems solved by technology

[0002] Solid superacid is a new type of catalyst discovered by humans. Because of its high acidity, it can activate saturated hydrocarbons that are inactive under normal conditions, and can cause various chemical reactions of saturated hydrocarbons. Moreover, because it overcomes the shortcomings of liquid acids, It is easy to separate from the reaction system, does not corrode equipment, is environmentally friendly, and can be reused. It has been paid more and more attention. In recent years, the research and development of solid superacids has become more and more extensive. However, due to the large amount of liquid acid, the acid center It has excellent fluidity, but the acid amount of solid acid is far less than that of liquid acid, mainly because the amount of acid is limited. The reason is that the specific surface area of ​​solid acid is low, which limits the number of acid centers and the combination point of carrier and sulfate Factors such as other factors affect the active acid content of solid acids. Although there are many invention patents that describe the preparation of solid acids in detail, most of them can only be prepared by ammonia hydrolysis combined with physical processing. Although these solid acids have many The strength of strong acid, because the amount of acid is limited, can not completely replace liquid acid and other defects

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