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Load typed iron catalyst and its preparing method and application

An iron catalyst and supported technology, which is applied in the field of supported iron oxide catalyst and in the coupling reaction of ethylbenzene dehydrogenation to styrene, and achieves the effect of high conversion rate of ethylbenzene

Inactive Publication Date: 2004-12-29
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding transition metals and rare earth elements as additives to supported iron catalysts has not been reported yet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1 accurately weighs 120 ℃ drying, specific surface area is 942m 2 2.0000g of activated carbon per gram, accurately measure 1.50mol / L of Fe(NO 3 ) 3 4.00ml solution to impregnate the carrier, let stand for 24 hours, dry in an oven at 120°C for 4-6 hours, N 2 Under the atmosphere of 500 ℃, roast for 5 hours, put into the desiccator. Obtain Fe / AC catalyst, Fe content 3.0mmol / g gac, denoted as catalyst A. The reaction temperature is 550°C, and the space velocity of ethylbenzene is 2.17h -1 , CO 2 The / EB molar ratio is 11, and the analysis method is: the liquid product is analyzed by a GC-7A gas chromatograph on a 1m × φ3mm dinonyl phthalate column, and detected by a hydrogen flame (FID). The tail gas is analyzed by a 2m×φ3mm carbon molecular sieve column and detected by thermal conductivity (TCD). The results are shown in Table 1.

Embodiment 2

[0024] Example 2 Accurately weighed and dried at 120°C, the specific surface area was 942m 2 2.0000 g of activated carbon (20-40 mesh) per gram, and accurately measure 1.50 mol / L of Fe(NO 3 ) 3 Solution 3.60ml and 1.25mol / L Mg(NO 3 ) 2 Solution 0.40ml, mix evenly, co-impregnate carrier, let stand for 24 hours, dry in oven at 120°C for 4-6 hours, N 2 Under the atmosphere of 500 ℃, roast for 5 hours, put into the desiccator. Obtain Fe content 2.7mmol / g gac, magnesium content is the FeMg / AC catalyst of 0.25mmol / g gac, denoted as catalyst B. The space velocity of ethylbenzene is 4.3h -1 , other conditions are with embodiment 1.

Embodiment 3

[0025] Embodiment 3 Accurately weighed 120 ℃ drying, specific surface area is 1200m 2 2.0000 g of activated carbon (20-40 mesh) per gram, and accurately measure 1.50 mol / L of Fe(NO 3 ) 3 Solution 3.60ml and 1.25mol / L Mg(NO 3 ) 2 0.40ml of the solution, mixed evenly, co-impregnated the carrier, stood still for 24 hours, and dried in an oven at 120°C for 4 to 6 hours; then weighed 1.25mol / L of Mg(NO 3 ) 2 Solution 0.40ml, impregnate the carrier for the second time, let stand for 24 hours, dry in an oven at 120°C for 4-6 hours, N 2 Under the atmosphere of 500 ℃, roast for 5 hours, put into the desiccator. Obtain Fe content 2.7mmol / g activated carbon, magnesium content is the FeMg / AC catalyst of 0.5mmol / g activated carbon, denoted as catalyst C. Other conditions are with embodiment 1.

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Abstract

A carried iron catalyst is prepared from activated carbon or gamma-Al2O3, iron and assistant through pulverizing activated carbon or gamma-Al2O3 by 20-80 meshes, preparing the mixed solution of Fe precursor and assistant precursor, immersing for 18-36 hrs, drying at 110-120 deg.c for 4-6 hrs, calcining at 450-650 deg.c for 4-5 hrs in nitrogen atmosphere and putting in drier. Its advantages are high ethylbenzene transform rate and high selectivity to styrene (95% or more).

Description

Technical field: [0001] The invention belongs to a catalyst for preparing styrene, in particular to a supported iron oxide catalyst and its application in the coupling reaction of ethylbenzene dehydrogenation to styrene. Background technique: [0002] Catalytic dehydrogenation of ethylbenzene is the main method to produce styrene, an important chemical raw material. Since this reaction is a strong endothermic reaction with increased number of molecules, the conversion rate is limited by thermodynamic balance, and high temperature (600-700° C.) and low pressure are favorable. In order to supply reaction heat and prevent coking of the catalyst in industry, a large amount of superheated steam needs to be introduced, which consumes a lot of energy and has low economic benefits. The development trend is to develop new catalysts and new processes with low temperature and low water ratio. In recent years, a new coupling process of ethylbenzene dehydrogenation and reverse water ga...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/74B01J23/889C07C5/42C07C15/46
Inventor 王建国孙爱灵秦张峰
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI