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Alkyl-alkenyl arene production catalyst by high-selectivity dehydrogenation of alkyl aromatics

A catalyst, ethylbenzene dehydrogenation technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, hydrocarbons, etc., can solve the problem of low yield, activity and selectivity, etc. problem, to achieve a highly selective effect

Inactive Publication Date: 2009-06-17
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technology provided by the present invention is to solve the problem of low single-yield catalysts caused by the contradiction between activity and selectivity in the past, and to provide a catalyst with high selectivity for the dehydrogenation of alkyl aromatics to alkenyl aromatics, especially a new ethylenic aromatic hydrocarbon catalyst Benzene dehydrogenation to styrene catalyst

Method used

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  • Alkyl-alkenyl arene production catalyst by high-selectivity dehydrogenation of alkyl aromatics
  • Alkyl-alkenyl arene production catalyst by high-selectivity dehydrogenation of alkyl aromatics
  • Alkyl-alkenyl arene production catalyst by high-selectivity dehydrogenation of alkyl aromatics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] [Example 1] With 93g iron oxide red, 217g iron oxide yellow, 81.6g salt of wormwood, 12.6g ammonium molybdate, 16g magnesium oxide, 9.4g calcium oxide, 31g cement, 1.9g lanthanum oxide, 4g pore expander (such as (Tanjing powder or carboxymethyl cellulose, etc.) into the kneader, after dry mixing for 2 hours, dissolve 85g of cerium nitrate in deionized water and add it, and knead for 1-2 hours to knead the material into an extrudable paste After taking out the material, through extrusion molding and strip breaking process, a cylindrical catalyst of Φ3~3.3mm×5~7mm is made, dried at 90-120°C for 4 hours, placed in a muffle furnace and calcined at 800°C for 6 hours After that, the temperature was naturally lowered to obtain the finished catalyst for activity evaluation. The actual amount of raw materials added to the catalyst is shown in Table 1, the mass percentage composition of the obtained catalyst is shown in Table 2, and the catalyst performance evaluation results are...

Embodiment 3

[0032] [Example 3] 150g iron oxide red, 168.2g iron oxide yellow, 93.3g potassium carbonate, 12.6g ammonium molybdate, 9.4g magnesium oxide, 9.4g calcium oxide, 27.3g cement, 1.9g lanthanum oxide, 3.8g reaming Agent, 68.4g cerium nitrate, the finished product catalyst is made and evaluated by the operation procedure of embodiment 1. The actual amount of raw materials added to the catalyst is shown in Table 1, the mass percentage composition of the obtained catalyst is shown in Table 2, and the catalyst performance evaluation results are shown in Table 3.

[0033] [Example 4] 194g iron oxide red, 130g iron oxide yellow, 77.4g potassium carbonate, 12.6g ammonium molybdate, 11.8g magnesium oxide, 9.4g calcium oxide, 27.7g cement, 1.9g lanthanum oxide, 3.8g pore expander , 74.6g cerium nitrate, make finished catalyst and evaluate by the operation procedure of embodiment 1. The actual amount of raw materials added to the catalyst is shown in Table 1, the mass percentage compositio...

Embodiment 5

[0034] [Example 5] 310g iron oxide yellow, 81.6g potassium carbonate, 12.6g ammonium molybdate, 11.8g magnesium oxide, 9.4g calcium oxide, 31g cement, 1.9g lanthanum oxide, 3.8g pore expander, 85g cerium nitrate, press The operation procedure of Example 1 produced a finished catalyst and evaluated it. The actual amount of raw materials added to the catalyst is shown in Table 1, the mass percentage composition of the obtained catalyst is shown in Table 2, and the catalyst performance evaluation results are shown in Table 3.

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Abstract

The invention relates to a high-selectivity alkane alkenyl aromatic hydrocarbon catalyst prepared by dehydrogenating alkyl aromatic hydrocarbon, in particular to a styrene catalyst prepared by dehydrogenating phenylethane. The catalyst takes iron-potassium-cerium-molybdenum as a main system, and is characterized by comprising the following main active components by mass percentage: 1) 50 to 85 percent of Fe2O3; 2) 7 to 15 percent of K2O; 3)1 to 6 percent of MoO3; 4) 2 to 13 percent of CeO2; 5) 1 to 6 percent of MgO; 6) 0.5 to 5 percent of CaO; and 7) 0.05 to 0.9 percent of La2O3. The catalyst prepared especially when iron oxide consists of pigment-grade iron oxide red containing no crystal water and pigment-grade iron oxide yellow containing one crystal water in certain proportion and when potassium oxide and iron oxide are selected within a certain proportion range, has the advantages of maintaining high selectivity and simultaneously raising conversion rate so as to obtain high once through yield of styrene.

Description

technical field [0001] The invention relates to a catalyst for preparing alkenyl aromatic hydrocarbons by dehydrogenating alkyl aromatics with high selectivity, in particular, it is suitable for preparing styrene by dehydrogenating ethylbenzene. Background technique [0002] At present, the industrially used catalysts for the dehydrogenation of ethylbenzene to styrene are all iron-based catalysts. That is to say, iron oxide is used as the main active component, and additives such as alkali metal or alkaline earth metal, rare earth element are added, and it is made by dry blending, extruding and activating. Catalyst activity, selectivity, and single-pass yield are technical indicators comprehensively required in industrial applications. Although the earlier published US patents US4467046, US4684619, and European patent EP0195252A2 have good activity, they have been gradually eliminated due to their Cr content. Catalysts with Fe-Potassium-Cerium-Molybdenum as the main system ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/881B01J23/889C07C15/46C07C5/333
Inventor 辛国萍张茵蒋卫国颉伟王继龙王涛梁玉龙
Owner PETROCHINA CO LTD
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