Preparation method of aluminium oxide-based carrier containing silicon and magnesium

An alumina-based and carrier-based technology, applied in catalyst carriers, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of catalyst acidity and weak comprehensive adjustment of active phase, and the reduction and improvement of the utilization rate of additives. Reasonable acidity and acidity distribution, enhanced activity stability, and improved performance

Active Publication Date: 2016-06-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The above-mentioned prior art uses co-precipitation method or adding additives during molding. The former will cause active metals and Si and other additives to enter the bulk phase during the co-precipitation process, and multiple substances are precipitated at the same time. The same precipitation conditions cannot be simultaneously The best precipitation conditions for a variety of substances, and the additives have no selectivity to the formation of the active metal active p

Method used

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preparation example Construction

[0019] In the present invention, the cloud point refers to the temperature at which the water-soluble silicone oil aqueous solution with a mass concentration of 1% is heated to turbidity, then the heating is stopped, and the aqueous solution is observed to change from turbidity to clarity under stirring. According to the preparation method of the modified alumina-based carrier provided by the present invention, it can specifically adopt the following steps:

[0020] 1. Prepare the soluble magnesium-containing compound into solution A, wherein the concentration of the magnesium-containing compound is 0.1g / 100mL~24g / 100mL in terms of magnesium oxide;

[0021] 2. Prepare water-soluble silicone oil into solution B, wherein the concentration of water-soluble silicone oil is 0.1g / 100mL~20g / 100mL in terms of silicon oxide;

[0022] 3. Mix soluble magnesium-containing compound and water-soluble silicone oil to prepare solution C, wherein the concentration of magnesium-containing compo...

Embodiment 1

[0043] Take 3800g of macroporous aluminum hydroxide dry rubber powder, 200g of SB powder, add 160g of citric acid and 160g of safflower powder, and mix well. Then uniformly add 2900 g of dilute nitric acid aqueous solution, wherein the concentration of nitric acid is 2.8 wt%. The material was kneaded for 15 minutes, then rolled for 20 minutes, and extruded with a clover orifice plate with a diameter of 1.7mm. Dry at 120°C for 4h and then bake at 500°C for 4h. The calcined carrier is marked as Z.

[0044] The physical and chemical properties of alumina carrier Z are shown in Table 2:

[0045] Table 2 Physicochemical properties of alumina carrier Z

[0046] project Alumina carrier Z Specific surface area, m 2 / g 299 Pore ​​volume, mL / g 0.71 Pore ​​distribution, %

Embodiment 2

[0048] Weigh 15.9g of magnesium nitrate, add an appropriate amount of deionized water to dissolve, and make the volume 105mL, and obtain solution A1; weigh 16.5g of water-soluble silicone oil, add appropriate amount of deionized water to dissolve, and make the volume 105mL, and obtain solution B1; While stirring, slowly pour 35mL of B1 solution into 35mL of A1 solution, and add an appropriate amount of deionized water to make the final volume 86mL to prepare C1 solution.

[0049] Take 100g of alumina carrier Z, spray the solution C1 evenly on the alumina carrier, after curing for 10 hours, heat-treat at 105°C for 3 hours, and heat-treat at 240°C for 2 hours to obtain the modified carrier S1.

[0050] Dilute the solution 35mLB1 to 86mL with deionized water, spray it evenly on Z1, and keep it healthy for 10 hours, after heat treatment at 100°C for 2 hours, then dilute the 35mL A1 solution to 84mL with deionized water, spray it evenly on the carrier, and keep it healthy for 3 hour...

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Abstract

The invention discloses a preparation method of an aluminium oxide-based carrier containing silicon and magnesium. The preparation method comprises following steps: water soluble silicone oil and a soluble magnesium-containing compound are introduced into an aluminium oxide-based carrier successively or simultaneously, and the aluminium oxide-based carrier containing silicon and magnesium is obtained via heat treatment. The preparation method is capable of adjusting distribution of acid centers and hydrogenation active centers, achieving coordination effects, and improving catalyst performance; and the modified aluminium oxide-based carrier is suitable to be taken as a hydrogenation catalyst carrier.

Description

technical field [0001] The invention relates to a method for preparing a silicon-containing modified alumina carrier, which is especially suitable for a carrier of a hydrogenation denitrogenation catalyst. Background technique [0002] Most supported catalysts are prepared by impregnation method, such as various hydrogenation catalysts. Alumina is often used as a carrier material for this type of catalyst. but pure Al 2 o 3 The interaction force between the active metal on the surface and the carrier is relatively large, and it is easy to form inactive species (such as the formation of nickel-aluminum spinel), and it is difficult to completely vulcanize to form a type II active phase with high hydrogenation activity. At the same time, the acidity of the catalyst surface has a great influence on the activity of the hydrogenation catalyst. The removal of heteroatoms in the raw material requires the catalyst to have hydrogenolysis activity, which occurs on the acidic center ...

Claims

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Application Information

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IPC IPC(8): B01J32/00B01J27/19C10G45/08
Inventor 杨占林唐兆吉姜虹温德荣王继锋王平孙立刚
Owner CHINA PETROLEUM & CHEM CORP
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