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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

AI Technical Summary

Problems solved by technology

The alumina carrier used in US4740493A (EP0211397A), US4829043 A (EP0271814 A) and EP0501317 A1 patent publications contains a certain amount of Ca, Al, K, and Na soluble salts, claiming to reduce the decline rate of catalyst selectivity during use

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
Effect test

Embodiment 1

[0056] a) Preparation of carrier

[0057] 50-500 mesh, α-trihydrate Al 2 o 3 312g, more than 200 mesh, heavy alkaline earth metal content of 227ppm (by mass) fake Al monohydrate 2 o 3 92g, NH 4 F 7g was put into a mixer and mixed evenly, transferred to a kneader, added 0.12 liters 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 it at 80-120°C for more than 2 hours to reduce the free water content to below 10%.

[0058] Put the above-mentioned five-hole column into a bell kiln, raise it from room temperature to 1400°C in about 30 hours, and keep the temperature constant for 4 hours to obtain white α-Al 2 o 3 Carrier samples. The measured carrier performance data are listed in Table 1.

[0059] b) Preparation of silver catalyst

[0060] Take 700g of silver nitrate and dissolve it in 7...

Embodiment 2

[0072] Same as Example 1, except that 61 g of petroleum coke was added when preparing the carrier. Carrier data are shown in Table 1. Silver catalyst data and catalytic performance data are shown in Table 2.

Embodiment 3

[0078] With embodiment 1, difference is that, use heavy alkaline earth metal content to be the α-trihydrate Al of 490ppm 2 o 3 212g, heavy alkaline earth metal content is the false monohydrate Al of 52ppm 2 o3 192g and add Vaseline 10g, NH 4 F7g; the temperature of the five-hole column is raised from room temperature to 1230°C for 12 hours; when preparing the impregnation solution, add 2.8g of strontium acetate instead of 3.6g of barium acetate, 0.3g of lithium sulfate and 0.6g of perrhenic acid; after impregnation The carrier was heated at 220°C. The data of the prepared carrier is shown in Table 1; the data of the silver catalyst and the 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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