Ethyl benzene oxidizing-dehydrogenation catalyst

An ethylbenzene dehydrogenation and catalyst technology, which is applied in physical/chemical process catalysts, molecular sieve catalysts, organic chemistry and other directions, can solve problems such as poor catalyst stability, and achieve the effects of improving stability, good catalytic activity and improving dispersion.

Active Publication Date: 2006-08-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Vislovskiy V P et al. (Vislovskiy V P, Chang J-S, Park M-S, et al. Ethylbenzene into styrene with carbon dioxide over modified vanadia-alumina catalysts [J]. Catal. C

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0018] Example 1

[0019] Synthesis of VAPO-5 molecular sieve: 15g dry rubber powder (Al 2 O 3The content is 65.8%, produced by Changling Catalyst Factory), after adding 60 mL of water to beating for 60 minutes, 14g of orthophosphoric acid solution (phosphoric acid content 85%, produced by Beijing Reagent Factory) is slowly added dropwise to it. After stirring for 10 minutes, add 2.3 g of vanadyl sulfate pentahydrate (22% V, dissolved in 2g of water), continue stirring at room temperature for 60 minutes, and add 16 mL of template triethylamine (content 98%, Beijing) at a rate of 1 mL / min. Reagent factory production). After stirring for 1 hour, it was placed in a crystallization kettle for dynamic crystallization at 175°C for 72 hours. The obtained product was washed with water and dried at 80°C, and the sample was calcined at a temperature programmed in flowing air (120°C, 1 hour; 3°C / min to 550°C; kept for 4 hours and then slowly cooled to room temperature)...

Example Embodiment

[0021] Example 2

[0022] Accurately weigh 0.533g of sodium nitrate, add water to 20ml, and stir until the sodium nitrate is completely dissolved; then accurately weigh 20.000g of VAPO-5 molecular sieve (above 40 mesh) dried at 393K, and impregnate the molecular sieve with the prepared sodium nitrate solution. Let it stand for 24 hours, dry in an oven at 383K for 24 hours, calcine at 773K for 3 hours, and put it in a desiccator to obtain Na / VAPO-5 catalyst, which is referred to as catalyst B. The composition of the catalyst is 0.01mmolNa 2 O / g VAPO-5.

Example Embodiment

[0023] Example 3

[0024] Accurately weigh 0.414g of lithium nitrate, add water to 20ml, and stir until the lithium nitrate is completely dissolved; then accurately weigh 20.000g of VAPO-5 molecular sieve (above 40 mesh) dried at 393K, and impregnate the molecular sieve with the prepared lithium nitrate solution. Let it stand for 24 hours, dry it in an oven at 383K for 24 hours, calcinate at 773K for 3 hours, and put it in a desiccator to obtain a Li / VAPO-5 catalyst, denoted as catalyst C. The composition of the catalyst is 0.5mmolLi 2 O / g VAPO-5.

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Abstract

This invention discloses an ethyl benzene oxy-dehydrogenation catalyst, its feature is that it is mainly consisted by active constituent and auxiliary agent, the active constituent said is molecular sieve with vanadium element in bone frame structure, and the auxiliary agent is alkali metal or. The content of the auxiliary agent computed as metal oxide in every gram catalyst is 0.01-3.0mmol.

Description

technical field [0001] The invention relates to a catalyst for oxidative dehydrogenation of ethylbenzene, and more particularly relates to a catalyst for preparing styrene by oxidative dehydrogenation of ethylbenzene with molecular sieve as an active component and a supporting auxiliary agent under a carbon dioxide atmosphere. Background technique [0002] Styrene is an important chemical raw material, and 90% of its output is produced by the direct dehydrogenation of ethylbenzene on an iron oxide catalyst. This method requires a large amount of superheated steam, which is condensed into liquid after the reaction, and the latent heat of vaporization of the water vapor is not recycled, so the energy consumption is relatively large, and the method has the disadvantage that the yield of styrene is limited by thermodynamic equilibrium. In this reaction system, if CO 2 Replacing water vapor can increase the equilibrium conversion rate of ethylbenzene and r...

Claims

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Application Information

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IPC IPC(8): B01J29/84C07C5/333C07C15/46
Inventor 余少兵张晓昕宗保宁慕旭宏郑金玉王宣张君屹
Owner CHINA PETROLEUM & CHEM CORP
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