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Preparation method and application of alumina carrier

A technology of alumina carrier and carrier, applied in the direction of catalyst carrier, chemical instrument and method, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problems of limited improvement of activity and selectivity

Active Publication Date: 2015-11-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the improvement that these methods bring to support performance and catalyst activity and selectivity is also very limited, so this area still needs to improve the manufacture method of support, in order to be beneficial to manufacture the silver catalyst with better performance

Method used

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  • Preparation method and application of alumina carrier
  • Preparation method and application of alumina carrier
  • Preparation method and application of alumina carrier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] 50~500 mesh α-trihydrate A1 2 o 3 390g, more than 200 mesh fake monohydrate A1 2 o 3 110g, NH 4 Put F7g into a mixer and mix evenly, transfer it to a kneader, add 90 ml of dilute nitric acid (nitric acid: water = 1:3, weight ratio), and knead it into a paste that can be extruded. Extrude into a five-hole column with an outer diameter of 8.0mm, a length of 6.0mm, and an inner diameter of 1.0mm, and dry it at 80-120°C for more than 2 hours to reduce the free water content to below 10%. Then put the green body into an electric furnace, raise it from room temperature to 1200°C after about 20 hours, and keep the temperature constant for 2 hours to obtain white A1 2 o 3 Carrier semi-finished products. Then, soak with 500g of barium acetate aqueous solution containing 0.5wt% for half an hour, filter and dry at 80-120°C for 2 hours, then soak with 0.3wt% of tetraethyl orthosilicate aqueous solution for half an hour, filter and dry After drying at 80-120°C for 2 hours, fi...

Embodiment 2

[0076] 50~500 mesh α-trihydrate A1 2 o 3 390g, more than 200 mesh fake monohydrate A1 2 o 3 110g, NH 4 Put F7g into a mixer and mix evenly, transfer it to a kneader, add 90 ml of dilute nitric acid (nitric acid: water = 1:3, weight ratio), and knead it into a paste that can be extruded. Extrude into a five-hole column with an outer diameter of 8.0mm, a length of 6.0mm, and an inner diameter of 1.0mm, and dry it at 80-120°C for more than 2 hours to reduce the free water content to below 10%. Then put the green body into the electric furnace, raise it from room temperature to 600°C after about 10 hours, and keep the temperature constant for 2 hours to obtain white A1 2 o 3 Carrier semi-finished products. Then, soak with 500g of barium acetate aqueous solution containing 0.5wt% for half an hour, filter and dry at 80-120°C for 2 hours, then soak with 0.3wt% of tetraethyl orthosilicate aqueous solution for half an hour, filter and dry After drying at 80-120°C for 2 hours, fi...

Embodiment 3

[0078] 50~500 mesh α-trihydrate A1 2 o 3 390g, more than 200 mesh fake monohydrate A1 2 o 3 Put 110g into a mixer and mix evenly, transfer to a kneader, add 90ml of dilute nitric acid (nitric acid: water = 1:3, weight ratio), and knead it into a paste that can be extruded. Extrude into a five-hole column with an outer diameter of 8.0mm, a length of 6.0mm, and an inner diameter of 1.0mm, and dry it at 80-120°C for more than 2 hours to reduce the free water content to below 10%. Then put the green body into the electric furnace, raise it from room temperature to 600°C after about 10 hours, and keep the temperature constant for 2 hours to obtain white A1 2 o 3 Carrier semi-finished products. Then soak the above-mentioned A1 with 500g of 0.3wt% orthosilicate aqueous solution 2 o 3 The carrier semi-finished product is half an hour, filtered and dried at 80-120°C for more than 2 hours, then put into an electric furnace, and after about 20 hours, it is raised from room tempera...

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Abstract

The invention relates to a method for preparing an alumina carrier. The method comprises the following steps: (I) preparing a mixture including alpha-Al2O3 trihydrate, pseudo-Al2O3 monohydrate and auxiliaries; (II) adding an adhesive into the mixture obtained in the step (I); (III) uniformly kneading the mixture obtained in the step (II), extruding and molding; (IV) drying the product obtained in the step (III), and roasting for the first time to obtain a carrier semi-finished product; (V) soaking the product obtained in the step (IV) with an auxiliary solvent, and drying; (VI) roasting the product obtained in the step (V) for the second time. The invention further relates to the alumina carrier prepared by the method, a silver catalyst prepared by the carrier and application of the silver catalyst. The silver catalyst is used for producing ethylene oxide by ethylene oxidation, and has excellent activity and stability.

Description

technical field [0001] The invention relates to a method for preparing an alumina carrier and its application, in particular to a method for preparing an alumina carrier for a silver catalyst used in ethylene oxidation to produce ethylene oxide (EO) and a silver catalyst prepared from the carrier , and the application of the catalyst in the production of ethylene oxide by oxidation of ethylene. Background technique [0002] Under the action of silver catalyst, the oxidation of ethylene mainly produces ethylene oxide, and at the same time, side reactions produce carbon dioxide and water, among which activity, selectivity and stability are the main performance indicators of silver catalyst. The so-called activity refers to the reaction temperature required when the production process of ethylene oxide reaches a certain reaction load. The lower the reaction temperature, the higher the activity of the catalyst. The so-called selectivity refers to the ratio of the moles of ethy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J32/00B01J21/04B01J21/12B01J21/06B01J35/10B01J23/68C07D301/10C07D303/04
CPCY02P20/52
Inventor 林强孙欣欣陈建设李金兵张志祥林伟李贤丰任冬梅曹淑媛王辉
Owner CHINA PETROLEUM & CHEM CORP
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