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Catalyst for dehydrogenating alkyl arene in preparing alkyl alkenyl arene

A technology of alkenyl aromatics and alkyl aromatics, which is applied in the field of catalysts for the dehydrogenation of ethylbenzene to styrene, can solve the problems of low strength and selectivity, and achieve improved selectivity, high crushing strength, and good water resistance Effect

Active Publication Date: 2006-08-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is that there are low-potassium catalysts in the prior art that have the disadvantages of low strength and low selectivity, and provide a new catalyst for the dehydrogenation of alkyl aromatics to prepare alkenyl aromatics

Method used

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  • Catalyst for dehydrogenating alkyl arene in preparing alkyl alkenyl arene

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Experimental program
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Effect test

Embodiment 1

[0037] 250.0 grams of iron oxide red, 140.0 grams of iron oxide yellow, 70.0 grams of potassium carbonate, 96.0 grams of cerium nitrate, 9.6 grams of ammonium molybdate, 8.0 grams of magnesium oxide, 6.0 grams of calcium oxide, 4.0 grams of copper oxide, 1.2 grams of zinc oxide, 1.2 28.0 grams of titanium oxide, 28.0 grams of aluminate cement, and 15.0 grams of carboxymethyl cellulose were stirred in a kneader for 1 hour, added deionized water, and stirred for another half an hour. Millimeter particles are put into an oven, baked at 80°C for 2 hours, and baked at 120°C for 2 hours, then placed in a muffle furnace, and roasted at 900°C for 4 hours to obtain a finished catalyst.

[0038] 100 milliliters of catalysts are loaded into the reactor, at normal pressure, liquid space velocity 1.0 hours -1 , 620°C, and water ratio (weight) 2.0, the activity evaluation was carried out, and the crushing strength of the catalyst was measured. The test results are listed in Table 1.

Embodiment 2

[0040] Prepare catalyst by the method for embodiment 1, difference is with 280.0 gram iron oxide red, 140.0 gram iron oxide yellow, 50.0 gram potassium carbonate, 96.0 gram cerium nitrate, 9.6 gram ammonium molybdate, 8.0 gram magnesium oxide, 10.7 gram carbonic acid Calcium, 4.0 grams of manganese oxide, 1.2 grams of zinc oxide, 1.2 grams of vanadium pentoxide, 13.5 grams of aluminate cement, and 16.0 grams of carboxymethyl cellulose.

[0041] Carry out activity evaluation and strength measurement according to the evaluation condition of embodiment 1 and the method for measuring the crushing strength, and the test results are listed in Table 1.

Embodiment 3

[0043] The catalyst is prepared according to the method of Example 1, except that 160.0 grams of iron oxide red, 90.0 grams of iron oxide yellow, 58.0 grams of potassium carbonate, 75.0 grams of cerium oxalate, 7.8 grams of ammonium molybdate, 7.0 grams of magnesium oxide, 7.0 grams of oxide Calcium, 4.0 grams of tin oxide, 1.2 grams of zinc oxide, 1.2 grams of zirconia and 5.0 grams of aluminate cement, 12.0 grams of carboxymethyl cellulose.

[0044]Carry out activity evaluation and strength measurement according to the evaluation condition of embodiment 1 and the method for measuring the crushing strength, and the test results are listed in Table 1.

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Abstract

The present invention relates to one kind of catalyst for dehydrogenating alkyl arene to prepare alkyl alkynyl arene and aims at raising the selectivity and strength of low potassium catalyst. The technological scheme of the present invention includes replacing Portland cement in the Fe-K-Ce-Mo-Mg-Ca catalyst system with aluminate cement and adding selecting modulation agent. The catalyst system may be used in industrial production to prepare alkyl alkynyl arene.

Description

technical field [0001] The present invention relates to a catalyst for dehydrogenating alkyl aromatics to prepare alkenyl aromatics, in particular to a catalyst for dehydrogenating ethylbenzene to prepare styrene. Background technique [0002] Industrially, alkenyl aromatics are mainly produced by catalytic dehydrogenation of alkyl aromatics. One of the keys to this method is to select a dehydrogenation catalyst with high activity, high selectivity and high stability. At present, iron-based catalysts with iron oxide as the main active component and potassium oxide as the main co-catalyst are commonly used in industry. It is well known that iron-based catalysts have high activity, and the dehydrogenation reaction of alkylaromatics is a macromolecular reaction controlled by internal diffusion, which requires the catalyst to have large channel pores. In the development and production of catalysts, ordinary portland cement, which acts as a bind...

Claims

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Application Information

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IPC IPC(8): B01J23/88B01J23/889B01J27/19C07C5/333C07C15/46
Inventor 宋磊缪长喜徐永繁邬时海
Owner CHINA PETROLEUM & CHEM CORP
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