Bifunctional catalyst, and preparation method and application thereof

Abstract

The invention relates to a bifunctional catalyst, and a preparation method and application thereof, and belongs to the technical field of catalyst preparation. The bifunctional catalyst is a sulfonated mesoporous molecular sieve SBA-15 loading Pd, wherein the mass of Pd accounts for 0.1-5.0% of that of the bifunctional catalyst, and the molar content of the sulfur element in the bifunctional catalyst satisfies S / (Si + S) and equals 5-20%. The bifunctional catalyst is used for preparing methyl isobutyl ketone from acetone through a one-step method. Specifically, acetone and hydrogen gas are used as raw materials; under the action of the bifunctional catalyst, a liquid phase one-step method is adopted to synthesize methyl isobutyl ketone in a high pressure reactor. Compared with the prior art, the catalyst prepared by using the method provided by the invention has good thermal stability, structural stability, and uniform acid sites; the reaction conditions for preparing methyl isobutyl ketone from acetone through the one-step method are mild, and the catalyst efficiency is high.

Description

technical field [0001] The invention relates to a catalyst and its preparation and application, in particular to a bifunctional catalyst and its preparation method and application. Background technique [0002] As an important chemical intermediate, methyl isobutyl ketone is a high-grade organic solvent, mainly used as a solvent for paints, resin coatings, nitrocellulose, certain cellulose ethers, camphor, grease, natural and synthetic rubber. The paint formulated with methyl isobutyl ketone has good leveling performance, hard paint film, moderate volatility, and can lower the viscosity of the paint, especially suitable for paints with high solid content. In addition, methyl isobutyl ketone is also widely used in non-ferrous metal smelting and oil refining industries, and has a wide range of uses. [0003] The method of synthesizing methyl isobutyl ketone with acetone is mainly divided into three-step method and one-step method. The traditional three-step method has disadva...

AI Technical Summary

Problems solved by technology

Although the Pd-resin catalyst has a suitable acid center, the yield of methyl isobutyl ketone using this type of catalyst is high, but there are many disadvantages, the catalyst regeneration is difficult, the service life is short, and the operating conditions are harsh.

Patent CN104588098A discloses a catalyst with hydrogen-type strongly acidic cationic resin treated with an organic solvent as a carrier and Pd as an active component. Although the catalyst has better performance, the reaction conditions are harsh and the resin has poor high temperature resistance

For Pd-oxide catalysts, although they are resistant to high temperatures, there are many by-products derived from them, resulting in low selectivity of methyl isobutyl ketone. In recent years, there have been many studies on its modification.

Patent CN102557904A discloses Pd / γ-Al modified with lanthanum salt 2 o 3 Catalyst, although the selectivity of methyl isobutyl ketone is relatively high, its acetone conversion rate is only 30%, and the activity is still unsatisfactory

There are also many researches on non-precious metal catalysts. CN101875012A discloses a Ni / Mg-Al with Ni as the active component in a fixed bed reactor. 2 o 3 Catalyst, CN103801338A discloses that Ni is an active component with alumina as a carrier, manganese sulfate and chromium sulfate as auxiliary agents, although its acetone conversion rate is high, the selectivity of methyl isobutyl ketone is generally low, and there are by-products excessive phenomenon

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