Catalyst for preparing styrene through ethylbenzene dehydrogenation and preparation method of catalyst

A technology for ethylbenzene dehydrogenation and ethylbenzene dehydrogenation, which is applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc. low activity problems

Active Publication Date: 2014-01-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] One of the technical problems to be solved by the present invention is the problem of low initial catalyst activity and long induction period in the prior art, and a new catalyst for ethylbenzene dehydrogenation to styrene is provided

Method used

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  • Catalyst for preparing styrene through ethylbenzene dehydrogenation and preparation method of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 261.5 grams of iron oxide red, 152.0 grams of iron oxide yellow, 70.0 grams of potassium carbonate, 76.8 grams of cerium oxalate, 10.2 grams of ammonium molybdate, 4.0 grams of magnesium oxide, 4.0 grams of graphite, and 10.6 grams of carboxymethyl cellulose were stirred in a kneader For 1 hour, dissolve 6.3 grams of cerium ammonium nitrate in an appropriate amount of deionized water, then add it to the kneader, and stir for another half an hour, take out the extruded strips, extrude them into particles with a diameter of 3 mm and a length of 5 to 10 mm, and put them in the oven , baked at 50°C for 2 hours, baked at 100°C for 10 hours, then placed in a muffle furnace, calcined at 200°C for 8 hours, and then calcined at 600°C for 20 hours to obtain the finished catalyst.

[0025] 100 milliliters of finished catalysts are loaded into the reactor, under normal pressure and liquid space velocity for 1.0 hours －1 , 620°C, and water vapor / ethylbenzene (weight ratio) 2.0 for a...

Embodiment 2

[0028] 253.1 grams of iron oxide red, 100.0 grams of iron oxide yellow, 65.0 grams of potassium carbonate, 75.0 grams of cerium oxalate, 11.5 grams of ammonium tungstate, 11.3 grams of ammonium molybdate, 15.5 grams of magnesium oxide, 11.8 grams of calcium carbonate, 2.0 grams of polystyrene Microspheres and 16.5 grams of carboxymethyl cellulose were stirred in a kneader for 1 hour, 13.0 grams of ammonium cerium nitrate was dissolved in an appropriate amount of deionized water, then added to the kneader, stirred for another half an hour, taken out and extruded into Particles with a diameter of 3 mm and a length of 5 to 10 mm were put into an oven, baked at 50°C for 6 hours, then placed in a muffle furnace, calcined at 300°C for 4 hours, and then calcined at 800°C for 10 hours to obtain a finished catalyst.

[0029] Activity evaluation was carried out according to the evaluation conditions of Example 1, and the test results are listed in Table 2.

[0030]

Embodiment 3

[0032] 213.0 grams of iron oxide red, 90.0 grams of iron oxide yellow, 70.0 grams of potassium carbonate, 73.0 grams of cerium oxalate, 16.3 grams of ammonium molybdate, 5.0 grams of calcium hydroxide, 9.8 grams of magnesium oxide, 5.0 grams of hydroxyethyl cellulose and 20.3 grams Stir carboxymethyl cellulose in a kneader for 1 hour, dissolve 20.0 grams of ammonium cerium nitrate in an appropriate amount of deionized water, then add it to the kneader, and stir for another half an hour, take out the extrusion, and extrude it into a diameter of 3 mm and a length of The particles of 5-10 mm are placed in an oven, baked at 50°C for 2 hours, and baked at 100°C for 10 hours, then placed in a muffle furnace, calcined at 350°C for 4 hours, and then calcined at 820°C for 5 hours to obtain a finished catalyst.

[0033] Activity evaluation was carried out according to the evaluation conditions of Example 1, and the test results are listed in Table 2.

[0034]

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Abstract

The invention relates to a catalyst for preparing styrene through ethylbenzene dehydrogenation and a preparation method of the catalyst and mainly aims to solve the problems of lower initial activity and longer induction period of the catalyst in the prior art. The technical problems are better solved through the technical scheme that the catalyst and the preparation method thereof are adopted, wherein the catalyst is prepared by adding cerium sources including ammonium ceric nitrate and cerous oxalate as raw materials into a ferrum-potassium-cerium-molybdenum or tungsten catalyst system according to the required proportion. The catalyst can be used for the industrial production of styrene prepared through ethylbenzene dehydrogenation.

Description

technical field [0001] The invention relates to a catalyst for preparing styrene by dehydrogenating ethylbenzene and a preparation method thereof. Background technique [0002] At present, the basic composition of the catalyst for preparing styrene from ethylbenzene dehydrogenation in industry includes main catalyst, co-catalyst, pore forming agent and binder. Early catalysts were Fe-K-Cr systems, such as published US Patent 4467046 and European Patent 0296285A1. Although this type of catalyst has good activity and stability, it has been phased out gradually because the catalyst contains Cr oxides and causes certain pollution to the environment. Later, it evolved into Fe-K-Ce-Mo series, replacing Cr with Ce, which can better improve the activity and stability of the catalyst, and at the same time overcome the disadvantages of high toxicity and environmental pollution of Cr. Then develop to be the catalyst of Fe-K-Ce-Mo-Mg series, as disclosed EP502510, WO9710898, CN1233604...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/887B01J23/888C07C15/46C07C5/333
Inventor 危春玲宋磊缪长喜徐永繁朱敏
Owner CHINA PETROLEUM & CHEM CORP
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