Composite oxide carrier and preparation method thereof

Abstract

The invention relates to a compound oxide carrier and a preparation method, and belongs to the filed of catalyst preparation, wherein the compound oxide carrier is prepared by compounding gamma-aluminum oxide, silicon dioxide and zirconium dioxide. The method comprises the following steps: co-precipitating precursors of the aluminum oxide, the silicon dioxide and the zirconium dioxide with alkali solution, adding surfactant into the mixture to improve the pore structure and acidity and alkaline, then washing, filtering and roasting the obtained sediment at high temperature to obtain compound oxide powder, and finally extruding and molding the compound oxide powder to obtain the carrier. The pore structure and the acidity and the alkaline of the obtained carrier have wide adjustable ranges, the specific surface of the carrier is 200 to 500 m<2> per gram, the pore volume thereof is 0.4 to 1.2 milliliters per gram, and the total acid amount of NH3-TPD is 0.2 to 0.8mmol / g. The carrier prepared by the method is suitable for preparing hydrogenation catalysts of petroleum fractions.

Description

technical field [0001] The invention relates to a preparation method of a hydrogenation refining catalyst carrier, in particular to a composite oxide carrier and a preparation method thereof. Background technique [0002] The preparation process of alumina carrier is simple, the specific surface is high, the mechanical strength is good, and the pore size is suitable. It is one of the most widely used catalyst carriers at present. The preparation and modification of alumina carrier and the preparation of aluminum-containing composite oxides have always been scientific research The direction of worker research. [0003] Chinese patent CN03133563.2 introduces a preparation method of silicon-phosphorous alumina with large pore volume and suitable surface acid properties. Use sodium metaaluminate, silicon-containing compound and carbon dioxide gas to react into a gel, filter, wash, dry, and roast to obtain a composite alumina carrier with a specific surface of 260-350m 2 / g, th...

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Problems solved by technology

[0005] Chinese patent CN01116022.5 prepared a complex of titanium dioxide and silicon dioxide or titanium dioxide and alumina by the sol-gel method, although the specific surface>400m 2 / g, pore volume>0.6ml / g, adjustable acidity, but the drying process requires supercritical drying, the cost is high, and it does not contain zirconium that can promote catalytic performance

[0006] Chinese patent CN00123133.2 discloses a zirconium-containing alumina carrier and its preparation method. The zirconium-containing alumina carrier is obtained by adding a zirconium-containing compound in the form of kneading during the molding process of the carrier; the lateral compressive strength of the carrier is improved, The acidity is maintained at a relatively stable stage, the infrared acidity is 0.25-0.32mmol / g, and the pore distribution is concentrated in the mesopore range. The disadvantage is that the kneading method makes the zirconia unevenly distributed in the carrier

[0007] To sum up, the preparation methods reported in the current literature have complex processes, high preparation costs, and difficulties in meeting the requirements of high specific surface area, large pore volume, and adjustable acidity and alkalinity at the same time.

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