Preparation method of aluminum oxide containing phosphorus and silicon

Abstract

The invention relates to a preparation method of an aluminum oxide containing phosphorus and silicon. The method comprises the following steps: (1) mixing and pulping pseudo-boehmite and enough water for pulpifying the pseudo-boehmite and dispersing evenly; (2) adding an ammonium salt with univalent anions, stirring and standing; (3) stirring slurry in the step (2) evenly, adding a phosphoric acid or a mixture of the phosphoric acid and phosphate; and (4) finally adding a silicon-containing compound to the slurry obtained in the step (3), stirring evenly, drying and roasting to obtain the aluminum oxide containing the phosphorus and the silicon. An aluminum oxide carrier prepared through the method is capable of keeping the characteristics of high specific surface area and large pore volume of the pseudo-boehmite, the acid content of the aluminum oxide carrier can be simply adjusted by using the content of the phosphorus and the silicon within a relatively large range, and the carrier can be applied to multiple fields; and the aluminum oxide is added in the preparation process of a catalytic cracking catalyst, so that the heavy oil conversion ability of the catalyst can be improved and the yield of a target product is increased.

Description

technical field [0001] The present invention relates to a kind of preparation method of aluminum oxide, more specifically relate to a kind of preparation method of phosphorous and silicon-containing aluminum oxide. Background technique [0002] Alumina, especially γ-alumina, because of its good pore structure, specific surface and thermal stability, [0003] It is often used as a matrix material for the preparation of catalysts. Alumina is used as the matrix material of catalytic cracking (FCC) catalyst, which can not only improve the matrix activity of FCC catalyst but also improve the anti-wear performance and anti-heavy metal ability of the catalyst. In order to improve the selectivity of the cracking reaction, alumina needs to be modified before it is used in the FCC catalyst substrate. For example, phosphorus-modified alumina can reduce the dry gas and coke yield of the catalyst, and at the same time improve the catalyst’s performance. Strength; introducing a certain ...

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Problems solved by technology

The above-mentioned patents all need to add strong acids such as hydrochloric acid and nitric acid to acidify and peptize the alumina precursor, and the peptization speed is fast, resulting in poor fluidity and uniformity of the colloid, which is likely to cause inhomogeneity in the physical and chemical properties of alumina products, thus affecting alumina. The surface properties and performance of the carrier; and the acid strength of inorganic acids such as nitric acid and hydrochloric acid is very strong, which can easily damage the pore structure of pseudo-boehmite

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