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Method for preparing silver catalyst carrier

A silver catalyst and carrier technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of low ethylene oxide selectivity, high water absorption, small bulk specific gravity, etc. The effect of high selectivity and activity, low water absorption, and large bulk specificity

Inactive Publication Date: 2003-06-25
CHINA PETROLEUM & CHEM CORP +1
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AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is in order to overcome that the carrier water absorption rate that the α-alumina of flake crystal configuration is made in previous literature is made is big, bulk specific gravity is little, the silver catalyst that carrier is prepared from thus is used for ethylene epoxidation reaction, The shortcoming of the low selectivity of generating ethylene oxide provides a new preparation method of silver catalyst carrier

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0038] 1, the preparation of carrier B: according to the carrier preparation method of embodiment 1, just change the consumption of magnesium nitrate hexahydrate to 3.5 grams, and change the adding time of magnesium nitrate into after adding fluorine compound, before roasting. The relevant properties of carrier B are shown in Table 1.

[0039] 2. Preparation of catalyst B: according to the catalyst preparation method in Example 1, but using carrier B.

[0040] 3. Reaction performance test of catalyst B: according to the catalyst reaction performance test method in Example 1. The ethylene epoxidation reaction performance of Catalyst B is shown in Table 2. [Example 3]

Embodiment 3

[0041] 1. Preparation of carrier C: According to the carrier preparation method in Example 1, only the amount of magnesium nitrate hexahydrate was changed to 7 grams, and the addition time of magnesium nitrate was changed to be added simultaneously with the fluorine compound. The relevant properties of carrier C are shown in Table 1.

[0042] 2. Preparation of catalyst C: according to the catalyst preparation method in Example 1, but using carrier C.

[0043] 3. Reaction performance test of catalyst C: according to the catalyst reaction performance test method in Example 1. The ethylene epoxidation reaction performance of Catalyst C is shown in Table 2. [Comparative Example 1]

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Abstract

The present invention relates to a method of preparing silver catalyst carrier and aims at overcoming the demerits of high water absorption rate, small bulk density, low selectivity, etc. of prepared silver catalyst. The present invention adopts the technological scheme including adding fluoride and magnesium compound before roasting, roasting to obtain alpha-alumina powder of sheet crystal configuration, then adding pore-creating agent, adhesive and water, and secondary sintering. The present ivnention may be used in industrial production of silver catalyst carrier.

Description

technical field [0001] The present invention relates to a method for preparing silver catalyst supports. Background technique [0002] Supported silver catalysts are widely used in the industrial epoxidation of ethylene to ethylene oxide. High selectivity and high activity are two important properties of silver catalysts. The support plays a very large role in the performance of the silver catalyst. In order to suppress the side reaction of deep oxidation, materials with few pores and small specific surface area are usually used as carriers. In industry, α-alumina is usually used as the carrier of supported silver catalysts. [0003] Chinese patent CN1017780B introduces that hydrated alumina, fluoride and other additives are mixed, formed, and fired once to obtain an α-alumina carrier. Electron micrographs show that the α-alumina constituting the carrier is in the form of flaky crystals, and its specific surface area and water absorption ra...

Claims

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Application Information

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IPC IPC(8): B01J21/10
Inventor 卢立义顾国耀
Owner CHINA PETROLEUM & CHEM CORP
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