Carrier of silver catalyst for olefin epoxidation as well as preparation method and application thereof

A technology of silver catalyst and alumina carrier, which is applied in the direction of catalyst carrier, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve the problem of reducing the rate of decline in catalyst selectivity and achieve selectivity Improved effect

Active Publication Date: 2013-10-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The alumina carrier used in US4740493A (EP0211397A), US4829043 A (EP0271814 A) and EP0501317 A1 patent publications contains

Method used

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  • Carrier of silver catalyst for olefin epoxidation as well as preparation method and application thereof
  • Carrier of silver catalyst for olefin epoxidation as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0055] Example 1

[0056] a) Preparation of the carrier

[0057] Alpha-trihydrate Al with 50-500 mesh and heavy alkaline earth metal content of 28 ppm (by mass) 2 O 3 312g, more than 200 mesh, the content of heavy alkaline earth metal is 227ppm (by mass) pseudomonohydrate Al 2 O 3 92g, NH 4 7g of F was put into a mixer and mixed evenly, transferred to a kneader, added with 0.12 liter of dilute nitric acid (nitric acid: water = 1:3, weight ratio), and kneaded into an extrudable paste. It is extruded into a five-hole column with an outer diameter of 8.0 mm, a length of 6.0 mm and an inner diameter of 1.0 mm, and is dried at 80-120° C. for more than 2 hours to reduce the free water content to less than 10%.

[0058] Put the above-mentioned five-hole column into a bell jar kiln, raise the temperature from room temperature to 1400° C. for about 30 hours, and keep the constant temperature for 4 hours to obtain white α-Al 2 O 3 carrier sample. The measured carrier performan...

Example Embodiment

[0071] Example 2

[0072] The same as in Example 1, the difference is that 61 g of petroleum coke was added during the preparation of the carrier. See Table 1 for carrier data. The silver catalyst data and catalytic performance data are shown in Table 2.

Example Embodiment

[0077] Example 3

[0078] With the embodiment 1, the difference is that the use of heavy alkaline earth metal content is 490ppm α-trihydrate Al 2 O 3 212g, pseudomonohydrate Al with heavy alkaline earth metal content of 52ppm 2 O3 192g and adding Vaseline 10g, NH 4 F7g; the five-hole column was kept constant for 12h from room temperature to 1230°C; 2.8g of strontium acetate was added instead of 3.6g of barium acetate, 0.3g of lithium sulfate and 0.6g of perrhenic acid when preparing the dipping solution; after dipping The carrier was heated at 220 °C. The data of the prepared carrier is shown in Table 1; the silver catalyst data and catalytic performance data are shown in Table 2.

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Abstract

The invention relates to an alpha-alumina carrier of a silver catalyst for olefin epoxidation and a preparation method thereof. The mass content of alkaline earth metals in the carrier is not more than 900ppm, and the alkaline earth metals are selected from calcium, strontium and barium. The invention also discloses the silver catalyst comprising the carrier as well as a preparation method and application thereof. By adopting the method provided by the invention, the alpha-Al2O3 carrier with better mechanical properties can be prepared as well and the crushing strength of the alpha-Al2O3 carrier is more than 30N/grain and can meet the use requirements by simultaneously controlling the content of the alkaline earth metals in the raw materials without adding alkaline earth metal compounds in the carrier preparation process; and the selectivity of the catalyst is improved when the silver catalyst prepared from the carrier provided by the invention is used for olefin epoxidation, especially for production of ethylene oxide through ethylene oxidation.

Description

technical field [0001] The invention relates to a catalyst carrier and catalyst for olefins. More specifically, the present invention relates to a silver catalyst carrier and catalyst for olefin epoxidation. The present invention also relates to the preparation and application of the silver catalyst carrier and the silver catalyst. Background technique [0002] Alkenes can be directly oxidized to the corresponding olefin oxides by using molecular oxygen as the oxidizing agent. The catalyst used for this oxidation reaction contains silver as catalytically active metal deposited on a support. Most of these catalysts comprise a porous inert support such as alpha-alumina with silver and other components deposited on the support. [0003] 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 them, activity, selectivity and stability are the main performance ind...

Claims

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Application Information

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IPC IPC(8): B01J32/00B01J23/66B01J23/68B01J21/04C07D303/04C07D301/10
CPCY02P20/52
Inventor 陈建设王辉王淑娟曹淑媛李金兵张志祥
Owner CHINA PETROLEUM & CHEM CORP
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