Titanium oxide-aluminum oxide composite carrier, preparation method and application thereof

Abstract

The invention discloses a titanium oxide-aluminum oxide composite carrier, a preparation method and application thereof. The preparation method of the titanium oxide-aluminum oxide composite carrier comprises the following steps: (1) mixing aluminum oxide, metatitanic acid and a solvent to obtain a mixture I; (2) carrying out high-energy ball milling on the mixture I to obtain a mixture II with a median particle size of less than 0.1 [mu]m; and (3) drying the mixture II, mixing the obtained dried product with an acid solution, and forming, drying and roasting in sequence. According to the invention, the titanium source used in the preparation method is low in cost, the preparation process is less in pollution, and TiO2 in the obtained titanium oxide-aluminum oxide composite carrier is uniformly distributed.

Description

technical field [0001] The invention belongs to the field of composite oxides, and in particular relates to a titanium oxide-alumina composite carrier and a preparation method and application thereof. Background technique [0002] TiO 2 The hydrogenation catalyst developed as a carrier has the characteristics of high activity, good low temperature activity and strong poisoning resistance, but TiO 2 As a catalyst carrier, there are also some weaknesses, such as its relatively small specific surface area, and the active anatase type is easily converted into an inert rutile structure at high temperature, with poor mechanical strength and weak acidity. 2 -Al 2 o 3 And other composite oxides are used as carriers to overcome the above shortcomings and meet the standards for industrial applications. Traditional industrial production containing TiO 2 The composite carrier method includes impregnation method, co-precipitation method and kneading method. The impregnation method m...

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Problems solved by technology

[0002] TiO 2 The hydrogenation catalyst developed as a carrier has the characteristics of high activity, good low temperature activity and strong poisoning resistance, but TiO 2 As a catalyst carrier, there are also some weaknesses, such as its relatively small specific surface area, and the active anatase type is easily converted into an inert rutile structure at high temperature, with poor mechanical strength and weak acidity. 2 -Al 2 o 3 and other composite oxides as carriers to overcome the above shortcomings and meet the standards for industrial applications

Traditional industrial production containing TiO 2 The composite carrier method includes impregnation method, co-precipitation method and kneading method. The impregnation method mostly uses titanium organic matter such as tetraethyl titanate and tetrabutyl titanate as the active component to impregnate the formed alumina, and the organic matter is co-precipitated. The precipitation method can use titanium chloride or metatitanic acid dissolved in concentrated sulfuric acid as the source of titanium. These methods require the use of expensive organic titanium sources, or the pretreatment of metatitanic acid with concentrated acid and / or concentrated alkali , there will be problems of corrosion of pipelines and containers, and anions that will affect subsequent production will be produced, so the production cost is high and there will be pollution emissions

Preparation of TiO-containing 2 Composite support, there will be TiO in the composite support with the increase of metatitanic acid content 2 The problem of uneven distribution, the surface activity of the carrier is not as good as that of the catalyst prepared by impregnation method or co-precipitation method, which affects the hydrogenation activity and stability of the catalyst under high space velocity conditions

[0003] Therefore, when preparing titania-alumina composite carriers in the prior art, there are expensive titanium sources, corrosion of pipes and containers, generation of pollutants, and TiO in titania-alumina composite carriers 2 The problem of uneven distribution that affects hydrogenation activity and stability

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