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Silver catalyst support, preparation and application for olefin epoxidation

A technology of silver catalyst and alumina carrier, applied in catalyst carrier, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve problems such as adverse effects on catalyst performance and adverse effects on catalyst performance , to achieve the effect of improving activity and selectivity

Active Publication Date: 2016-08-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of the flux leads to the introduction of the element Mg into the carrier, and the element Mg is distributed on the carrier phase or surface, which has an adverse effect on the performance of the catalyst.
In addition, the raw material of the carrier is usually natural alumina or its mixture. Impurity magnesium is inevitable. The impurity magnesium will not be lost during the manufacturing process of the carrier, and will eventually exist in the carrier and the catalyst, which will adversely affect the performance of the catalyst.

Method used

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  • Silver catalyst support, preparation and application for olefin epoxidation
  • Silver catalyst support, preparation and application for olefin epoxidation
  • Silver catalyst support, preparation and application for olefin epoxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] a) Preparation of carrier

[0059] 50-500 mesh, α-trihydrate Al 2 o 3 338g, greater than 200 mesh, magnesium content of 12ppm (by mass) pseudo-Al 2 o 3 145g, petroleum coke 0g, 2g finely ground barium sulfate, NH 4 F7g is put into the mixing device and mixed uniformly, then transfers to the kneader, adds dilute nitric acid (nitric acid: water=1: 3, weight ratio) 0.12 liters, and kneads 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%.

[0060] 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 performance data of the tested carriers are shown in Table 1.

[0061] b) Preparation of silver catalyst

[0062] Take 70...

Embodiment 2

[0074] Same as Example 1, except that 61 g of petroleum coke was additionally added when preparing the carrier. The data of the prepared carrier is shown in Table 1; the data of the silver catalyst prepared using the carrier of this embodiment and its catalytic performance data are shown in Table 2.

Embodiment 3

[0080] With embodiment 1, difference is: use the α-trihydrate Al that magnesium content is 42ppm (by mass) 2 o 3 212g, magnesium content is the false monohydrate Al of 92ppm (by mass) 2 o 3 192g and add Vaseline 10g, NH 4 F7g, 2g of finely ground barium sulfate; the five-hole column was kept at a constant temperature for 12h between room temperature and 1230°C; when preparing the impregnating solution, 2.2g of cesium sulfate and 1.4g of strontium acetate were added instead of 2.2g of cesium sulfate and 2.6 g barium acetate, 0.3 g lithium sulfate and 0.6 g perrhenic acid; the impregnated carrier was heated at 220°C. The data of the prepared carrier is shown in Table 1; the data and catalytic performance data of the silver catalyst prepared using the carrier of this embodiment 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 magnesium compounds in the carrier is not more than 100ppm in terms of magnesium. The invention also discloses the silver catalyst comprising the carrier as well as a preparation method and application thereof. By adopting the preparation method of the carrier, provided by the invention, the lateral crushing strength of the prepared the alpha-alumina carrier is more than 30N / grain and can meet the use requirements by simultaneously controlling the content of magnesium in the raw materials without adding fluxes in the carrier preparation process; meanwhile, the content of magnesium in the carrier is lower and is not more than 100ppm, so that the specific surface area and pore structure of the carrier still meet the use requirements even if carbon-containing materials which can be burnt out are not added or are added in a small amount; and the activity and selectivity of the catalyst are improved when the silver catalyst prepared after dipping the carrier in an active ingredient silver and auxiliaries 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 i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J32/00B01J23/66C07D301/10C07D303/04
CPCY02P20/52
Inventor 陈建设王辉何学勤任冬梅王淑娟李金兵张志祥
Owner CHINA PETROLEUM & CHEM CORP
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