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Preparation method of catalyst for styrene preparation by ethylbenzene dehydrogenation

A technology for the dehydrogenation of ethylbenzene and styrene, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the problem of low crushing resistance and specific surface area Large, small pore size and other issues, to achieve the effect of high crush resistance, low specific surface area, high catalytic activity

Active Publication Date: 2014-10-15
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the problems of low crush resistance, small pore size and large specific surface area of ​​existing ethylbenzene dehydrogenation catalysts, and provide a catalyst with high crush resistance, large pore size and small specific surface area , a preparation method of a catalyst for ethylbenzene dehydrogenation to styrene with high catalytic activity when carrying out ethylbenzene dehydrogenation reaction under low water ratio conditions

Method used

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  • Preparation method of catalyst for styrene preparation by ethylbenzene dehydrogenation
  • Preparation method of catalyst for styrene preparation by ethylbenzene dehydrogenation
  • Preparation method of catalyst for styrene preparation by ethylbenzene dehydrogenation

Examples

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Comparison scheme
Effect test

Embodiment 1

[0037]Dissolve 220.4g of cerium nitrate in 2600mL of water, and add 28% mass fraction of ammonia solution dropwise at a stirring rate of 450r / min until the precipitate disappears to obtain a transparent cerium ammonia complex solution. Add 700mL of 20% mass fraction urea solution dropwise at a rate of 1mL / min; raise the temperature to 60°C, stir at a rate of 500r / min for 8h, wash the precipitate to neutrality after cooling, dry at 120°C for 12h, and then The temperature was raised to 340°C at a rate of °C / min, and fired for 4 hours to obtain the finished nano-cerium oxide.

[0038] 306.8g iron oxide red, 62.2g iron oxide yellow, 36.8g prepared nano-cerium oxide, 11.8g ammonium molybdate, 15.2g magnesium oxide, 16g cement, and 12g carboxymethyl cellulose were stirred in a kneader for 1h; Dissolve 86.2g of potassium carbonate and 32.4g of cerium nitrate in deionized water respectively, pour them into the above mixture, and stir for 0.5h, take out the extruded strands, cut into g...

Embodiment 2

[0041] 306.8g iron oxide red, 62.2g iron oxide yellow, 32.4g nanometer cerium oxide prepared in embodiment 1, 11.8g ammonium molybdate, 15.2g magnesium oxide, 16g cement, 12g carboxymethyl cellulose are stirred in kneader 1h; Dissolve 86.2g of potassium carbonate and 88.4g of cerium nitrate in deionized water respectively, pour them into the above mixture, and stir for 0.5h, take out the extruded strips, cut into granules with a diameter of 3mm and a length of 5-6mm, and put them in Oven, bake at 80°C for 2 hours, bake at 120°C for 2 hours, then place in a muffle furnace, and bake at 800°C for 4 hours to obtain the finished catalyst. The mass percentage of the main active component in the catalyst is Fe 2 o 3 :70.4%,K 2 O: 11.4%, MgO: 3.0%, CeO 2 : 13.4%, MoO 3 : 1.8% (binder not included). The catalyst passed the boiling water and cold water tests. The activity evaluation results of the catalysts are shown in Table 1.

Embodiment 3

[0043] Dissolve 220.4g of cerium nitrate in 2600mL of water, and add 28% mass fraction of ammonia solution dropwise at a stirring rate of 450r / min until the precipitate disappears to obtain a transparent cerium ammonia complex solution. Add 700mL of 20% mass fraction urea solution dropwise at a rate of 1mL / min; raise the temperature to 60°C, stir at a rate of 500r / min for 8h, wash the precipitate to neutrality after cooling, dry at 120°C for 12h, and then The temperature was raised to 380°C at a rate of °C / min, and fired for 4 hours to obtain the finished nano-cerium oxide.

[0044] 280.0g iron oxide red, 56.8g iron oxide yellow, 32.4g prepared nano cerium oxide, 11.8g ammonium molybdate, 15.2g magnesium oxide, 16g cement, and 12g carboxymethyl cellulose were stirred in a kneader for 1h; Dissolve 86.2g of potassium carbonate and 88.4g of cerium nitrate in deionized water respectively, pour them into the above mixture, and stir for 0.5h, take out the extruded strands, cut them ...

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Abstract

Relating to a catalyst, the invention provides a preparation method of a catalyst for styrene preparation by ethylbenzene dehydrogenation. The catalyst has high crushing strength, large aperture and small specific surface area, and also has high catalytic activity in ethylbenzene dehydrogenation reaction under a low water ratio condition. The catalyst for styrene preparation by ethylbenzene dehydrogenation is a composite oxide of iron, potassium, magnesium, cerium and molybdenum. The method includes:1) preparation of nano-Ce2O3; and 2) preparation of the catalyst. According to a technical scheme, self-made nano-dicerium trioxide is adopted, and cerium nitrate and nano-dicerium trioxide in a proper ratio are introduced into the catalyst as the cerium source. The prepared catalyst has large aperture, small specific surface area and high crushing strength, and can maintain high catalytic activity under a low water-oil ratio condition.

Description

technical field [0001] The invention relates to a catalyst, in particular to a preparation method of a catalyst for preparing styrene from ethylbenzene dehydrogenation. Background technique [0002] Styrene is an important basic organic chemical raw material, which is widely used in the production of plastics, synthetic rubber and synthetic resin. Its traditional manufacturing method is to make by ethylbenzene dehydrogenation reaction, and the catalyst of patent report is divided into two classes: a class is Fe-K-Cr series, as disclosed U.S. Patent US4134858, US4152300 and US4144197, although this class catalyst The activity and stability of Cr are better, but Cr is highly toxic and causes serious environmental pollution, so it has been eliminated. The other is the Fe-K-Ce-Mo series, such as the published U.S. Patent US4804799 and European Patent EP0297685A1. This type of catalyst not only replaces Cr with Ce and Mo, but also has a greater degree of activity and stability t...

Claims

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Application Information

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IPC IPC(8): B01J23/887C07C15/46C07C5/333
Inventor 杨意泉袁成龙崔裕洋魏育才方维平
Owner XIAMEN UNIV
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