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Preparation method of silver catalyst carrier, carrier prepared by preparation method, silver catalyst prepared by carrier and application thereof

A technology of silver catalyst and alumina carrier, which is applied in the direction of catalyst carrier, catalyst activation/preparation, molecular sieve catalyst, etc. It can solve the problems of catalyst selectivity and activity decline, easy aggregation of silver particles, and low stability of silver catalyst

Active Publication Date: 2012-07-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Chinese patent application publication CN 1400048A proposes the use of α-Al 2 o 3 As a carrier, the sol of cerium or zirconium is added before, at the same time or after the preparation of the carrier, and then the silver and cocatalyst are loaded to prepare the silver catalyst, which solves the problem that the silver catalyst in the prior art is easy to aggregate with the prolongation of the reaction time. The silver catalyst is not stable enough or the catalyst activity is not high enough
[0008] Chinese patent application publication CN 1400053A proposes that by adding α-Al 2 o 3 The carrier is impregnated in the nickel nitrate solution to introduce the metal nickel component into the silver catalyst, which solves the problem that the silver catalyst is not stable and the selectivity and activity of the catalyst are easy to decline with the time of driving.
However, at present, the carrier composition of silver catalysts is almost all alumina, and the addition of titanium silicon molecular sieves to the preparation of silver catalyst carriers has not been reported.

Method used

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  • Preparation method of silver catalyst carrier, carrier prepared by preparation method, silver catalyst prepared by carrier and application thereof
  • Preparation method of silver catalyst carrier, carrier prepared by preparation method, silver catalyst prepared by carrier and application thereof
  • Preparation method of silver catalyst carrier, carrier prepared by preparation method, silver catalyst prepared by carrier and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] Embodiment 1 (comparison)

[0082] 200-500 mesh trihydrate α-Al 2 o 3 403g, 200-400 mesh fake Al monohydrate 2 o 3 81g, NH 4 F 7g and BaSO 4 1.0 g was put into a mixer and mixed evenly, then transferred to a kneader, added 90 milliliters of dilute nitric acid (nitric acid: water=1:3, weight ratio), and kneaded into a paste that could 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 at 80-120°C for 10 hours to reduce the free water content below 10% by weight to obtain a green body. Then put the green body into the electric furnace, raise it from room temperature to 1400 ° C over 30 hours, and then keep the temperature for 2 hours to obtain white α-Al 2 o 3 Carrier sample, named Z-1, the scanning electron microscope photo of the carrier is shown in figure 1 . Z-1 is a comparative example of the carrier sample obtained in Example 2-4.

Embodiment 2

[0084] 200-500 mesh trihydrate α-Al 2 o 3 379g, 200-400 mesh fake Al monohydrate 2 o 3 76g, TS-1 molecular sieve 30g, NH 4 F 7g and BaSO 4 1.0 g was put into a mixer and mixed evenly, then transferred to a kneader, added 84 ml of dilute nitric acid (nitric acid: water=1:3, weight ratio), and kneaded into a paste that could 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 at 80-120°C for 10 hours to reduce the free water content below 10% by weight to obtain a green body. Then put the green body into the electric furnace, raise it from room temperature to 1400 ° C over 30 hours, and then keep the temperature for 2 hours to obtain white α-Al 2 o 3 Carrier sample, named Z-2, the scanning electron microscope photo of the carrier is shown in figure 2 .

[0085] by comparison figure 1 with figure 2 It can be seen that the surface of the Z-2 carrier is smoother than that of the Z-1 car...

Embodiment 3

[0087] 200-500 mesh trihydrate α-Al 2 o 3 367g, 200-400 mesh fake Al monohydrate 2 o 3 74g, TS-1 molecular sieve 44g, NH 4 F 7g and BaSO 4 1.0 g was put into a blender and mixed evenly, then transferred to a kneader, added 83 ml of dilute nitric acid (nitric acid: water=1:3, weight ratio), and kneaded into a paste that could 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 at 80-120°C for 10 hours to reduce the free water content below 10% by weight to obtain a green body. Then put the green body into the electric furnace, raise it from room temperature to 1400 ° C over 30 hours, and then keep the temperature for 2 hours to obtain white α-Al 2 o 3 Carrier sample, named Z-3.

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Abstract

The invention relates to a preparation method of a porous alpha-alumina carrier of a silver catalyst used for ethylene oxide production by virtue of ethylene oxidation. The method is characterized in that before a formed body is formed, and a titanium silicalite is added into a formed body raw material. The silver catalyst prepared by the carrier which is prepared by the method shows excellent epoxidation capability and activity in the process of preparing ethylene oxide by virtue of ethylene oxidation. The invention also relates to the carrier prepared by the method, the silver catalyst prepared by the carrier, and application of the silver catalyst in ethylene oxide production by virtue of ethylene oxidation.

Description

technical field [0001] The present invention relates to a method for preparing a carrier for silver catalysts, the carrier thus prepared and applications thereof, more particularly, the present invention relates to a method for preparing a carrier for silver catalysts for ethylene oxidation to produce ethylene oxide method, the carrier not only includes alumina and additives, but also adds titanium silicon molecular sieves, thereby further improving the activity of the silver catalyst. 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 ...

Claims

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Application Information

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IPC IPC(8): B01J29/89B01J32/00B01J35/10C07D303/04
CPCB01J29/89C07D301/03B01J21/04B01J35/026B01J23/66B01J35/1009B01J2229/42B01J2229/20B01J35/1038B01J37/0009Y02P20/52C07D301/10B01J35/50B01J35/612B01J35/633B01J21/00B01J23/50B01J29/0325B01J29/0308B01J35/635
Inventor 李金兵李贤丰林伟林强陈建设张志祥曹淑媛王淑娟代武军
Owner CHINA PETROLEUM & CHEM CORP
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