Load type nano-au catalyst and the preparing method

Abstract

The present invention discloses a supported gold nano-particles catalyst and the preparation method of the same, which comprises Au, Ce, Zr, Al and Si; wherein Au is the main active component and has a mass percent of 0.1~4.0%; Ce and Zr are the assistant active component and has a mass percent of 3~57%, wherein the mol ratio of Ce to Zr is 1~10; Al and Si are the carrier and has a mass percent of 40~97%. The catalyst is prepared by a sequential immersion method, wherein the alumina or silicon oxide carrier is firstly impregnated by an aqueous liquid containing cerous nitrate and zirconium nitrate and then the gold component is impregnated. The present invention has the advantages of that: the preparation method is simple, the stability is excellent and the cost is low. For the reaction of preparing cyclohexanone and cyclohexanol by cyclohexane oxygenation, the catalyst of the present invention can obtain high ketone alcohol selectivity even under the condition of a high conversion, besides the peroxide content in the product is very low. For example, when the conversion of cyclohexane is 12.8%, the ketone alcohol selectivity is up to 92.6% and the peroxide content is only 0.7%.

Description

technical field

[0001] The invention relates to a supported nano-gold catalyst for preparing cyclohexanone and cyclohexanol by cyclohexane oxidation and a preparation method thereof. Background technique

[0002] Nano-gold catalysts have excellent low-temperature catalytic oxidation activity, which is one of the major discoveries in the field of catalysis in recent years. Gold catalysts have been found in CO and NO x Elimination of hydrocarbons, oxidation of hydrocarbons, water vapor shift, fuel cells and other fields have good application prospects. The common preparation methods of nano-gold catalysts include co-precipitation method, deposition precipitation method and so on. The catalyst obtained by the co-precipitation method has a low utilization rate of gold because part of the gold is wrapped by the carrier. The deposition precipitation method is generally suitable for supports with an isoelectric point of pH ≥ 6, and the catalysts prepared by these two methods sti...

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