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Dehydrogenation catalyst without potassium oxide

A technology of dehydrogenation catalyst and potassium oxide, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, organic chemistry, etc., and can solve the problems of rapid decline in catalyst performance and easy loss of potassium oxide

Active Publication Date: 2013-05-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is that the potassium oxide in the prior art is easy to lose, and the catalyst performance declines quickly. One or a new dehydrogenation catalyst without potassium oxide is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] 300 ml of 0.25 mol / L Fe(NO 3 ) 3 , 300 ml of 0.25 mol / L Mg(NO 3 ) 2 , 300 ml of 0.25 mol / L Ca(NO 3 ) 2 , 300 ml of 0.25 mol / L (NH 4 ) 6 Mo 7 o 24 solution and 45 ml of 0.25 mol / L Ho(NO 3 ) 3 After the solution was mixed evenly, 2000 ml of 0.50 mol / L Na 2 CO 3 solution, while stirring while adding dropwise, the precipitate obtained is filtered, washed with deionized water, mixed evenly with the adhesive and pore-forming agent, and made into a viscous paste suitable for extrusion. Cut into pellets with a diameter of 3mm and a length of 8-10mm, dry at 120°C for 12h, and then calcinate at 800°C for 4h to obtain a finished catalyst. Then 100g of the above catalyst with a molar ratio of iron / dysprosium of 1:0.15 is packed into a stainless steel reactor with a diameter of 25mm, and the reaction is carried out at 610°C, with a pressure of 1 atmosphere, a water ratio of 2.0 (wt), and an ethylbenzene space velocity of 1.0 hour Under the condition of -1, the dehydroge...

Embodiment 2

[0013] The rare earth holmium was changed to a mixed oxide of holmium and dysprosium, and the molar ratio of iron / holmium / dysprosium was 1:0.1:0.1, and the rest were the same as in Example 1.

Embodiment 3

[0015] The rare earth holmium was changed to the oxide of terbium, and the molar ratio of iron / terbium was 1:0.5, and the rest were the same as in Example 1.

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Abstract

The invention relates to a dehydrogenation catalyst without potassium oxide and mainly aims to solve the problems that the potassium oxide is easy to lose and the performance of the catalyst is reduced quickly in the prior art. The problems are better solved by using the technical scheme that the dehydrogenation catalyst without potassium oxide comprises the following components in percentage by weight: (a) 50-90% of Fe2O3; (b) 9-30% of MgO; (c) 5-15% of CaO; (d) 0.5-6% of MoO3; and (e) 5-35% of rare earth oxide addition agent, wherein the addition agent is an oxide of at least one of Tb, Dy and Ho from the lanthanum family. The dehydrogenation catalyst without potassium oxide can be used for industrial production of phenylethylene prepared by utilizing ethylbenzene dehydrogenation.

Description

technical field [0001] The present invention relates to a potassium oxide-free dehydrogenation catalyst. Background technique [0002] The research on catalysts for the dehydrogenation of ethylbenzene to styrene abroad began in the 1930s and has a history of nearly 80 years. The zinc-based and magnesium-based catalysts used in the initial industrialization of styrene production were quickly replaced by iron-based catalysts with good comprehensive performance, and are still in use today. On the basis of iron oxide, the introduction of basic promoters and metal oxide additives has successfully developed 2 o 3 -K 2 O-series ethylbenzene dehydrogenation catalysts are widely used in industry, see patents ZL 99113572.5 and ZL 95111761.0. Fe in this series of catalysts 2 o 3 is the main active component, K 2 O is an important activity promoter, K 2 The introduction of O can make Fe 2 o 3 The activity increases by orders of magnitude, while K 2 O is also a water gas react...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/887C07C15/46C07C5/333
CPCY02P20/52
Inventor 缪长喜宋磊陈铜张新玉
Owner CHINA PETROLEUM & CHEM CORP