Preparation method of aluminum oxide containing phosphorus and silicon

A silica-alumina and alumina technology, applied in chemical instruments and methods, catalyst supports, molecular sieve catalysts, etc., can solve the problems affecting the surface properties and performance of alumina supports, the inhomogeneity of the physical and chemical properties of alumina products, and the fluidity of colloids and poor uniformity, to achieve the effect of improving heavy oil conversion capacity, reducing peptization speed, and improving fluidity

Active Publication Date: 2017-10-31
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 physi

Method used

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  • Preparation method of aluminum oxide containing phosphorus and silicon
  • Preparation method of aluminum oxide containing phosphorus and silicon

Examples

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Embodiment 1

[0030] The preparation method of phosphorus-containing and silicon-containing alumina provided by the invention:

[0031](1) 1038 grams of pseudo-boehmite and 2849 grams of deionized water were mixed and beaten and dispersed; (2) 202 grams of ammonium chloride was added, stirred for 15 minutes, and left to stand for 24 hours; (3) then the slurry in step (2) was stirred After uniformity, add 160 grams of concentrated phosphoric acid at 15 g / min; (4) Finally, add 296 grams of silicic acid to the slurry in step (3), stir for 20 minutes, bake at 100°C for 2 hours, and roast at 500°C for 30 minutes to obtain phosphorous and silicon oxide Aluminum A1, its composition, specific surface area, and pore volume data are shown in Table 2.

Embodiment 2

[0033] Illustrate the preparation method of phosphorus-containing and silicon-alumina provided by the invention:

[0034] (1) Mix 968 grams of pseudo-boehmite with 6726 grams of deionized water, beat and disperse; (2) Add 608 grams of ammonium nitrate, stir for 30 minutes, and let stand for 20 hours; (3) Then stir the slurry in step (2) evenly Finally, add a mixture of 98 grams of concentrated phosphoric acid and 55 grams of diammonium hydrogen phosphate at 30 g / min; (4) finally add 368 grams of acidic silica sol to the slurry in step (3), stir for 25 minutes, bake at 120°C for 1 hour, and Roasting at ℃ for 30 minutes, phosphorus and silicon-containing alumina A2 was obtained, and its composition, specific surface area, and pore volume data are shown in Table 2.

Embodiment 3

[0036] Illustrate the preparation method of phosphorus-containing and silicon-alumina provided by the invention:

[0037] (1) 1168 grams of pseudo-boehmite and 3770 grams of deionized water are mixed and beaten and dispersed; (2) 323 grams of ammonium chlorate are added, stirred for 50 minutes, and left to stand for 12 hours; (3) then the slurry in step (2) is stirred After uniformity, add 30 grams of concentrated phosphoric acid at 60 g / min; (4) Finally, add 619 grams of acidic silica sol to the slurry in step (3), stir for 25 minutes, bake at 150°C for 1 hour, and roast at 550°C for 15 minutes to obtain phosphorus and silicon. Alumina A3, its composition, specific surface area, and pore volume data are shown in Table 2.

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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 ...

Claims

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Application Information

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IPC IPC(8): B01J32/00B01J27/182B01J29/80
CPCB01J27/182B01J29/80
Inventor 潘志爽李雪礼袁程远侯凯军刘明霞黄校亮张爱萍高雄厚张海涛谭争国蔡进军段宏昌丁伟郑云锋孙书红
Owner PETROCHINA CO LTD
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