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Aluminum oxide carrier and preparation method thereof

A technology of alumina carrier and alumina, which is applied in the direction of catalyst carrier, chemical instrument and method, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problem of difficult preparation of alumina carrier with specific surface area and low strength of alumina carrier and other issues, to achieve the effect of increased strength, low price, and reduced production costs

Active Publication Date: 2014-05-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, there are few examples of using alumina supports prepared from α-alumina trihydrate and pyrenite as the main raw materials, and the strength of the prepared alumina supports is low, and it is not easy to obtain high specificity. surface area of ​​alumina support

Method used

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  • Aluminum oxide carrier and preparation method thereof
  • Aluminum oxide carrier and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh 4.2g of analytically pure ethyl silicate, slowly add it into 130ml of 16.5wt% nitric acid solution under strong stirring, and keep stirring for 30min before use.

[0032]Put 440 g of 120-mesh pyrenite, 110.0 g of pseudoboehmite, and 8.0 g of ammonium fluoride into a mixer and mix evenly. Then transfer to a kneader, add the silicon-containing dilute nitric acid solution obtained above, and fully knead; then extrude into a five-hole column with an outer diameter of about 8.0mm, a length of 7.5mm, and an inner diameter of 1.0mm. Dry at 80°C for 10 hours to reduce the free water content to below 10wt%, and obtain an alumina carrier green body. Then it was placed in a high-temperature electric furnace, raised from room temperature to a roasting temperature of 1300°C over 30 hours, and kept at a constant temperature for 4 hours to obtain alumina carrier Sam2. The crushing strength, specific surface area and water absorption were measured. The results are shown in Table ...

Embodiment 2

[0034] The preparation method is roughly the same as that of Example 1, except that the calcination temperature is 1100° C., and the temperature is kept constant for 4 hours. The obtained alumina carrier Sam3 is measured for its crushing strength, specific surface area and water absorption. The results are shown in Table 1.

Embodiment 3

[0036] Weigh 4.3g of analytically pure ethyl silicate, slowly add it into 130ml of 16.5wt% nitric acid solution under strong stirring, and keep stirring for 30min before use.

[0037] Put 225.0g of 120 mesh pyrenite, 220.0g of 180~1000 mesh α-alumina trihydrate, 110.0g of pseudoboehmite, 8.0g of ammonium fluoride, and 1.0g of barium sulfate into the mixer and mix evenly . Then transfer to a kneader, add the silicon-containing dilute nitric acid solution obtained above, and fully knead; then extrude into a five-hole column with an outer diameter of about 8.0mm, a length of 7.5mm, and an inner diameter of 1.0mm. Dry at 80°C for 12 hours to reduce the free water content to below 10wt%, and obtain an alumina carrier green body. Then it was placed in a high-temperature electric furnace, raised from room temperature to 1300°C over 30 hours, and kept at a constant temperature for 4 hours to obtain alumina carrier Sam4. The crushing strength, water absorption and specific surface are...

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Abstract

The invention provides an aluminum oxide carrier which is higher in intensity and larger in specific surface area and is suitable for chemical industries such as olefin epoxidation reaction, alkyne and alkadiene selective hydrogenation or methane-steam conversion. The invention also provides an aluminum oxide carrier preparation method which is simple in technology and operation and has easily controlled conditions. Alpha-tri-hydro-aluminum oxide and / or surge aluminum stones and a proper amount of pseudo-boehmite and / or alumina sol which are low in cost and readily available are used as main raw materials, so that the production cost of the aluminum oxide carrier is lowered; meanwhile, due to the doping of a proper amount of a silicon source and other auxiliary ingredients, the strength of the carrier is obviously improved, and the specific surface area is properly enlarged; particularly, the strength of the carrier is further improved by controlling the temperature rise rate in a preparation process.

Description

technical field [0001] The invention relates to an alumina carrier and a preparation method thereof. Background technique [0002] Alumina has been widely used as an adsorbent, catalyst and catalyst carrier in the chemical industry, environmental protection, automobile exhaust treatment, etc., especially as a catalyst carrier in the chemical industry. [0003] In the environmental protection and chemical industries, industrial catalysts are usually used in continuous flow gas-solid, liquid-solid or gas-liquid-solid multiphase systems. In order to meet certain application requirements, alumina carriers are usually processed into spherical, cylindrical, clover-like strips, Raschig rings, porous honeycomb or gear shapes, and require certain mechanical strength, specific surface area and pore structure. High mechanical strength is for long-term use; large specific surface area is conducive to improving the activity of the catalyst, but may reduce the selectivity of the product,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J32/00B01J23/02B01J20/08
Inventor 蒋军陈建设林伟李金兵张志祥李贤丰薛茜高立新林强李淑云
Owner CHINA PETROLEUM & CHEM CORP
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