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Ethylbenzene dehydrogenation catalyst and preparation method thereof

A technology of ethylbenzene dehydrogenation and catalyst, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the problems of low conversion rate and selectivity of catalysts, Achieve the effects of reasonable acid-base adjustment, good dispersion and good catalytic effect

Active Publication Date: 2015-02-25
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is the low conversion rate and selectivity of the catalyst prepared by the traditional catalyst preparation method, and a new ethylbenzene dehydrogenation catalyst and its preparation method are provided

Method used

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  • Ethylbenzene dehydrogenation catalyst and preparation method thereof
  • Ethylbenzene dehydrogenation catalyst and preparation method thereof
  • Ethylbenzene dehydrogenation catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 632.5g iron nitrate, 60.53g cerium nitrate, 38.17g magnesium nitrate were dissolved in 250g deionized water to obtain solution A; 32.28g potassium carbonate and 3.68g ammonium heptamolybdate were dissolved in 130g deionized water to obtain solution B; Slowly add solution A to solution B, stir mechanically, after the slurry is uniform, adjust the pH to about 7 with 25% ammonia water, continue to stir and age for 1 hour, then transfer to the tray, dry at 120°C for 4 hours, roast at 380°C for 4 hours, and crush Obtain mixture C; mix mixture C, 10g sodium carboxymethylcellulose, and 10g cement evenly, add 75g deionized water, knead the wet material to a dough-like material suitable for extrusion, extrude, pelletize, put into an oven, and Dry at 120°C for 4 hours, place in a muffle furnace, and calcinate at 840°C for 4 hours to obtain a finished catalyst. Sieve out 16-24 mesh catalyst particles, put 5ml of the sieved catalyst into the evaluation reactor, and evaluate the cat...

Embodiment 2

[0029] The catalyst was prepared according to the recipe in Example 1, except that the pH was adjusted to about 5 with ammonia water, and the first calcination temperature was 400°C. The test and evaluation results are shown in Table 1.

Embodiment 3

[0031] The catalyst was prepared according to the recipe in Example 1, except that the pH was adjusted to about 6 with ammonia water, and the first calcination temperature was 360°C. The test and evaluation results are shown in Table 1.

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PUM

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Abstract

The invention discloses an ethylbenzene dehydrogenation catalyst and a preparation method thereof and relates to styrene. Fe2O3, CeO2, MgO, K2O and MoO3 serve as main active ingredients of the ethylbenzene dehydrogenation catalyst, and the ethylbenzene dehydrogenation catalyst comprises, by mass, 60%-80% of the Fe2O3, 8%-15% of the CeO2, 0.5%-4% of the MgO, 7%-13% of the K2O, 0.5%-3% of the MoO3 and the balance Portland cement serving as binding agents. The preparation method includes: adding a required quantity of soluble salt mixed solution with Fe, Ce and Mg elements into a mixed solution of K2CO3 and ammonium heptamolybdate to obtain suspension liquid, regulating a pH (potential of hydrogen) value to 4-7 by ammonium hydroxide, aging, drying and baking to form a mixture A; mixing the mixture A with pore-enlarging additives and the binding agents, adding water to make the mixed substance into doughy materials, extruding to form strips and baking after drying to obtain the ethylbenzene dehydrogenation catalyst. The ethylbenzene dehydrogenation catalyst is high in dispersity, good in catalytic effect and more reasonable in pH regulation.

Description

technical field [0001] The invention relates to styrene, in particular to an ethylbenzene dehydrogenation catalyst and a preparation method thereof. Background technique [0002] Styrene is an important chemical raw material. The catalytic dehydrogenation of ethylbenzene is the main production method of styrene in industry, and the key of this method lies in the catalyst. Since the 1980s, the research on ethylbenzene dehydrogenation catalysts has undergone several important changes: [0003] (1) The catalyst has changed from the early Fe-K-Cr series (US patent US5376613, US4717781, Chinese patent CN87100517) to the environmentally friendly Fe-K-Ce-Mo catalyst (US patent US4804799, European patent EP0502510A1, EP0305020A1). [0004] (2) The catalyst changes from high potassium to low potassium. In order to reduce the steam consumption in the styrene production process, a high-potassium catalyst came into being. High potassium is beneficial to improve the anti-coking ability...

Claims

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Application Information

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IPC IPC(8): B01J23/887C07C15/46C07C5/333
Inventor 杨意泉崔裕洋李扬张祥连奕新方维平
Owner XIAMEN UNIV
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