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Ethylbenzene dehydrogenating catalyst and preparation method thereof

An ethylbenzene dehydrogenation and catalyst technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the problem of poor stability of ethylbenzene dehydrogenation catalyst, Problems such as rapid decline in activity

Active Publication Date: 2012-05-30
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main problem to be solved by the present invention is to overcome the shortcomings such as poor stability of ethylbenzene dehydrogenation catalysts in industrial applications and too fast decline in activity. Add a variety of metal oxide stabilization additives

Method used

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  • Ethylbenzene dehydrogenating catalyst and preparation method thereof
  • Ethylbenzene dehydrogenating catalyst and preparation method thereof
  • Ethylbenzene dehydrogenating catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 306.1 grams of red iron oxide, 110.1 grams of potassium carbonate, 9.2 grams of ammonium tungstate, 12.2 grams of ammonium molybdate, 10.0 grams of calcium oxide, 10.0 grams of barium oxide, 11.3 grams of copper oxide, 4.25 grams of zinc oxide, 1.0 grams of vanadium pentoxide , 15.0 grams of cement, 15.0 grams of sodium carboxymethylcellulose, after adding to the kneader and dry mixing for 3 hours, 185.2 grams of cerium nitrate, 0.75 grams of cobalt nitrate and 0.25 grams of lanthanum nitrate were dissolved in deionized water and added therein, and kneaded for 1.5 hours, knead the material into an extrudable paste, take it out, and make a cylindrical catalyst of Φ(2.7~3.3)mm×(5~8)mm through extruding and breaking processes. Dry for 4 hours, dry at 120°C for 4 hours, place in a muffle furnace at 140°C, 260°C, 370°C, and 800°C for 2 hours, 2 hours, 2 hours, and 4 hours, and then cool down naturally to obtain the finished catalyst. Activity evaluation, the evaluation resul...

Embodiment 2

[0041] Catalyst is prepared by the method of embodiment 1, difference is, iron oxide red 346.9 grams, 88.1 grams of potassium carbonate, ammonium molybdate 18.4 grams, calcium oxide 12.5 grams, magnesium oxide 11.0 grams, barium oxide 7.5 grams, copper oxide 10.0 grams , 2.2 grams of zinc oxide, 1.5 grams of cobalt nitrate, 0.2 grams of lanthanum nitrate, 0.1 grams of titanium dioxide, 18.0 grams of sodium carboxymethyl cellulose, cerium is added in the form of cerium oxalate and cerium nitrate, of which 52.9 grams of cerium nitrate and 41.0 grams of cerium oxalate , and the evaluation results are shown in Tables 2 and 3.

Embodiment 3

[0043] Prepare catalyst by the method for embodiment 1, iron oxide red 372.4 grams, potassium carbonate 73.4 grams, ammonium tungstate 21.4 grams, calcium oxide 15.0 grams, barium oxide 7.5 grams, copper oxide 7.5 grams, zinc oxide 1.5 grams, lead dioxide 0.1 gram, cobalt nitrate 0.75 gram, lanthanum nitrate 0.15 gram, cerium adds with the form of cerium oxalate and cerium nitrate, and wherein cerium nitrate 46.3 grams, cerium oxalate 35.9 grams, evaluation result is shown in Table 2 and 3.

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Abstract

The invention relates to an ethylbenzene dehydrogenating catalyst and a preparation method thereof. A plurality of metallic oxide stabilizing additives of WO3 and / or MoO3, CaO, BaO, CuO, ZnO2, Co2O3 and La2O3 are added into a catalyst which uses Fe-K-Ce-Mo (or W or Mo-W) as the main system. The catalyst has higher activity and selectivity, low inactivation speed and high stability, is suitable for preparing stryrene by dehydrogenating ethylbenzene, and is also suitable for preparing isopropenylbenzene by dehydrogenating isopropyl benzene, and preparing 4-isopropenyltoluene by dehydrogenating p-cymene. The catalyst is prepared by adopting a kneading method.

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 vast majority of styrene devices in the world are produced by catalytic dehydrogenation. The development of dehydrogenation catalysts has gone through several generations, from the previous zinc-based catalysts to the current general-purpose iron-based catalysts. During the use of ethylbenzene catalytic dehydrogenation catalyst, the fluctuation of raw materials and working conditions has a great influence on its performance, which makes the migration and loss of potassium, an important additive in the catalyst, more serious, and makes the physical structure of the catalyst change greatly. As a result, the service life of the catalyst is reduced, the stability is obviously deteriorated, and the activity of the catalyst in the later stage of use is obviously not as good as before. In th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/78B01J23/80B01J23/83B01J23/881B01J23/882B01J23/885B01J23/888C07C5/333C07C15/46
CPCY02P20/52
Inventor 王涛李晓艳姚文君梁玉龙王继龙常晓昕颉伟龚光碧吴江张才张峰岳宝荣成飞龙
Owner PETROCHINA CO LTD
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