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Load typed varadium catalyst and its preparing method and application

A catalyst and a supported technology, which are applied in the application field of a supported vanadium oxide catalyst and the coupling reaction of ethylbenzene dehydrogenation to styrene

Inactive Publication Date: 2003-07-23
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 alkali metals (Li, Na), alkaline earth metals, transition metals, and rare earth elements as additives to supported vanadium catalysts has not been reported yet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1 Accurately weigh and dry at 120°C, the specific surface area is 942m 2 2.0000 g of activated carbon (20-40 mesh) per gram, accurately measure 0.579 mol / L of NH with a pipette 4 VO 3 3.00ml solution impregnated carrier, let stand for 24 hours, dry in oven at 120°C for 4-6 hours, N 2 Under the atmosphere of 500 ° C, calcined for 5 hours, put it into a dryer to obtain a V / AC catalyst, the V content is 0.87mmol / g activated carbon, which is designated 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 was 11. The analysis method is: the product is analyzed by a GC-7A gas chromatograph on a 1m×φ3mm dinonyl phthalate column, detected by a hydrogen flame (FID), the tail gas is analyzed by a 2m×φ3mm carbon molecular sieve column, and detected by a 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, accurately measure 0.579 mol / L of NH with a pipette 4 VO 3 Solution 3.00ml and 1.50mol / L LiNO 3 Solution 0.20ml, 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. The VLi / AC catalyst with a V content of 0.87mmol / g activated carbon and a lithium content of 0.15mmol / g activated carbon was obtained, which was designated as catalyst B. 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, accurately measure 0.579 mol / L of NH with a pipette 4 VO 3 Solution 3.00ml and 1.50mol / L NaNO 3 Solution 0.20ml, 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. The obtained V content is 0.87mmol / g activated carbon, and the VNa / AC catalyst whose sodium content is 0.15mmol / g activated carbon is denoted as catalyst C. Other conditions are with embodiment 1.

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Abstract

A carried vanadium catalyst is prepared from activated carbon or gamma-Al2O3, vanadium and assistant through pulverizing activated carbon or gamma Al2O3 by 20-80 meshes, preparing the solutions of V precursor and assistant precursor, immersing for 18-36 hr, 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 transform rate of ethylbenzene (more than 60%) and high selectivity to styrene (more than 96%).

Description

Technical field: [0001] The invention belongs to a catalyst for preparing styrene, in particular to the application of a supported vanadium oxide catalyst and the coupled 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/22B01J23/28B01J23/34B01J23/755B01J23/76C07C5/42C07C15/46
Inventor 王建国孙爱灵秦张峰
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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