Solid super acidic catalyst and its preparing method

Abstract

The present invention discloses a solid super acidic catalyst and its preparation method. It is characterized by that the concentration of sulfuric acid radical ion in the solid super acid is 10-15 wt%, halide content of aluminium is 1-5 wt%, water content in the catalyst is less than 1 wt% and the rest is ZrO2 carrier, the mean pore size of said catalyst is 5-15nm. Its preparation method includes the following steps: adding water to dissolve zirconium oxychloride, using ammonia water to regulate pH value of solution to 9-10 and forming zirconium hydroxide precipitate; filtering and cleaning said precipitate until the pH value of filtrate is 6.9-7.1, having no Cl-, drying; mixing the precipitate with halide powder of aluminium, grinding to make grain size be less than 100 meshes, then using sulfuric acid solution whose concentration is 0.1-1.0 mol / L to soak the above-mentioned material, filtering, drying, roasting for 2-5 hr at 600-700deg.C so as to obtain the invented product solid super acidic catalyst.

Description

technical field [0001] The present invention relates to a kind of solid superacid catalyst and preparation method thereof, more specifically relate to a kind of modified ZrO containing sulfate ion 2 Supported solid superacid catalyst and its preparation method. Background technique [0002] A solid superacid is a solid acid with a stronger acidity than 100% sulfuric acid, expressed by the Hammett acidity function, the H of 100% sulfuric acid 0 =-11.93, while the H of the solid superacid 0 <-11.93. Compared with traditional catalysts, solid superacids have the following characteristics: (1) high catalytic efficiency, less dosage, less side reactions, and less by-products; (2) can be used at high temperatures, reusable, and the separation of catalysts and products is simple ; (3) non-corrosive, not polluting the environment; (4) the preparation method is simple and can be prepared by general metal salts. Due to the above advantages, the research and application of solid...

AI Technical Summary

Problems solved by technology

However, high catalyst calcination temperature will cause catalyst crystallization and reduce SO 4 2- The specific surface area bound to the catalyst

High calcination temperature can also cause SO 4 2- The decomposition of the catalyst reduces the activity of the

In addition, solid superacids are easy to absorb water, and the activity of solid superacids will also decrease after absorbing water.

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