Phosphor and silicon-containing alumina supporter and preparing method thereof

A kind of alumina carrier, alumina technology, applied in the direction of catalyst carrier, chemical instrument and method, chemical/physical process, etc., can solve the inhomogeneity of alumina physical and chemical properties, affect the surface properties and performance of silicon-containing alumina carrier, etc. problem, to achieve the effect of improving catalyst level, easy molding, and acidity improvement

Inactive Publication Date: 2005-05-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantage is that the silicon source introduced into the system is sodium silicate solution, which is a colloidal substance. This silicon source and its addition method have the influence of the process on the properties and / or microstructure of alumina
The colloidal substance in the form of micelles is in an uneven state in contact with the alumina system, especially when the concentration of alumina in the reaction system increases, the inhomogeneity of the system is more obvious, and it is easy to cause the inhomogeneity of the physical and chemical properties of the product alumina properties, thus affecting the surface properties and performance of the silicon-containing alumina carrier

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0013] The preparation process of phosphorus-containing, silicon-alumina carrier of the present invention is:

[0014] (1) The aluminum-containing salt solution is mixed with a precipitating agent under stirring conditions to obtain aluminum hydroxide precipitation, which is then aged, washed and filtered. Aluminum-containing salt solution and precipitation agent can be aluminum chloride and ammoniacal liquor, aluminum sulfate and ammoniacal liquor, aluminum nitrate and ammoniacal liquor, aluminum sulfate and sodium metaaluminate, sodium metaaluminate and nitric acid, sodium metaaluminate and carbon dioxide etc., preferably without Production of aluminum sulfate and sodium metaaluminate polluted by ammonia nitrogen. Conditions such as precipitation and aging can be properly adjusted according to the desired properties of alumina.

[0015] (2) beat the filter cake obtained by the above filtration, add phosphorus-containing compound, control the temperature of the slurry to 30-...

Embodiment 1

[0032] Step 1 Add 1200ml of deionized water to a clean container, heat up to 65°C, add sodium metaaluminate aqueous solution with a specific gravity of 1.35 at a flow rate of 30ml / min and aluminum sulfate aqueous solution with a specific gravity of 1.15 at a flow rate of 65ml / min, and simultaneously add Into stirred deionized water, maintain temperature 65°C, pH 8.5, add time 90 minutes.

[0033] Step 2 After stopping feeding, the system was aged for 90 minutes under the above pH and temperature conditions, and the filtered filter cake was slurried with deionized water, and washed with sodium carbonate solution for 5 times until Na + Content4 ＝ Content+++ content <0.08m%.

[0034] Step 3 Add the aluminum hydroxide filter cake to a solution of 2.5L of deionized water and 42g of 85m% phosphoric acid to make a slurry evenly, control the temperature of the slurry to 65°C, and filter after slurrying for 40 minutes.

[0035] In step 4, the filter cake was directly dried at 120° C....

Embodiment 2

[0038] Step 1 is the same as Step 1 and Step 2 of Example 1.

[0039] Step 2 changes the 42.0g85m% phosphoric acid in embodiment 1 step 3 into 56g85m% phosphoric acid according to embodiment 2, i.e. the cost example, and the properties are shown in Table 1 (2).

[0040] Step 3 is the same as Step 4 and Step 5 of Embodiment 1.

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Abstract

The invention relates to a phosphorus- and silicon-containing alumina carrier and a preparation method thereof. Silicon is uniformly dispersed on the surface of the alumina carrier, and the pores of the carrier with a diameter of 3 to 15 nm account for more than 90% of the total pore volume. The method of adding the carrier auxiliary agent in the present invention is as follows: adding auxiliary agent phosphorus during the precipitation aging process, adding auxiliary agent silicon during the carrier molding process, and the raw material of the auxiliary agent silicon is nano silicon dioxide. Adopting the method of the invention to prepare the phosphorus-containing and silicon-alumina carrier, the molding is easy, the process is simple, and the cost is low; at the same time, it has excellent physical and chemical properties and performance, especially has concentrated pore distribution and suitable surface acidity, and is suitable for heavy fractions Carrier for catalysts such as oil hydrodesulfurization and denitrogenation.

Description

1. Technical field [0001] The invention relates to an alumina carrier and a preparation method thereof, in particular to a phosphorus- and silicon-containing macroporous alumina carrier with a large specific surface area and a preparation method thereof. 2. Background technology [0002] Generally, heavy distillate hydrocracking pretreatment catalysts are supported by alumina or alumina containing one or more other elements such as Si, Ti, P, B, F, etc. In the catalyst preparation process, the above elements can be introduced into the system at different stages, and the purpose is basically the same, that is, to adjust the acidity of the catalyst and / or to improve the interaction between the active component and the support. In the synthesis process of carrier raw materials, if aluminum hydroxide is prepared by precipitation method, and a variety of above-mentioned elements are added at the same time, due to the change in the order of adding each material, the position of a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J32/00C10G45/04
Inventor 魏登凌彭绍忠祁兴维
Owner CHINA PETROLEUM & CHEM CORP
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