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Loaded V-P-O catalyst and its prepn and use

A technology of vanadium phosphorus oxide and vanadium phosphorus oxide, which is applied in the direction of physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, chemical instruments and methods, and can solve the problem of butane conversion rate and maleic anhydride selectivity Low-level problems, to achieve the effect of small distribution

Inactive Publication Date: 2003-11-05
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Butane conversion and maleic anhydride selectivity are low on such supported catalysts, such as on ordinary SiO 2 The butane conversion rate of the supported VPO catalyst prepared by the aqueous phase impregnation method is about 50%, and the maleic anhydride selectivity is lower than 20% [see J.Phys.Chem.B, 101 (1997) 6895]

Method used

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  • Loaded V-P-O catalyst and its prepn and use
  • Loaded V-P-O catalyst and its prepn and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh V 2 o 5 0.55 g, placed in the mixture of isobutanol / benzyl alcohol (6.1ml / 6.1ml), refluxed at 140°C for 5 hours, added 0.26 g of polyethylene glycol (PEG2000) with a molecular weight of 2000, and added Fumed SiO 2 Carrier 5.24 g, continue to reflux for 1 hour, according to the atomic ratio of P / V=1.2 / 1.0, add 85% H 3 PO 4 0.5ml. Reflux was continued for 6 hours. Filter and dry to obtain a blue precipitate, which is dried in air at 120°C. The prepared catalyst precursor powder is compressed into tablets under 0.5MPa pressure, broken, and 20-40 mesh particle samples are sieved and placed in a reaction atmosphere (C 4 h 10 / O 2 / N 2 =1.5 / 17.2 / 81.3) in situ at 400°C for 12 hours to obtain an activated fresh catalyst with a specific surface area of ​​206m 2 / g.

Embodiment 2

[0027] Weigh 0.5 g of the activated fresh catalyst and place it in a quartz reaction tube with an inner diameter of 0.8 cm to evaluate the catalytic performance. At a reaction temperature of 360°C and a space velocity of 1200h -1 , the feed gas composition is C 4 h 10 / O 2 / N 2 Reaction under the condition of =1.5 / 17.2 / 81.3 (V / V), the reaction mixture gas is analyzed by online gas chromatography, and its n-butane conversion rate is 28.1%, maleic anhydride selectivity is 77.9%, and maleic anhydride yield is 21.9% . Embodiment 2: Weighing V 2 o 51.11 grams, placed in the mixed solution of isobutanol / benzyl alcohol (12.2ml / 12.2ml), after reflux at 140°C for 5 hours, add 0.52 grams of polyethylene glycol (PEG2000) with a molecular weight of 2000, and add Fumed SiO 2 Carrier 4.86 g, continue to reflux for 1 hour, according to the atomic ratio of P / V=1.2 / 1.0, add 85% H 3 PO 4 1.0ml. Reflux was continued for 6 hours. Filter and dry to obtain a blue precipitate, which is d...

Embodiment 3

[0028] Weigh 0.5 g of the activated fresh catalyst and place it in a quartz reaction tube with an inner diameter of 0.8 cm to evaluate the catalytic performance. At a reaction temperature of 380°C and a space velocity of 1200h -1 , the feed gas composition is C 4 h 10 / O 2 / N 2 Reaction under the condition of =1.5 / 17.2 / 81.3 (V / V), the reaction mixture gas is analyzed by online gas chromatography, and its n-butane conversion rate is 38.3%, maleic anhydride selectivity is 71.3%, and maleic anhydride yield is 27.3% . Embodiment 3: Weighing V 2 o 5 1.60 grams, placed in the mixed solution of isobutanol / benzyl alcohol (30.0ml / 25.0ml), refluxed at 140°C for 5 hours, added 0.75 grams of polyethylene glycol (PEG2000) with a molecular weight of 2000, and added Fumed SiO 2 Carrier 2.00 g, continue to reflux for 1 hour, according to the atomic ratio of P / V=1.2 / 1.0, add 85% H 3 PO 4 1.44ml. Reflux was continued for 6 hours. Filter and dry to obtain a blue precipitate, which i...

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Abstract

The catalyst consists of loaded vanadium and phosphor oxide and SiO2 carrier formed via pyrogenic decomposition with the loaded amount being 15-58 wt%. It has a V / P atom ratio of 1.2, specific area 117-210 sq m / g, and the main phase being vanadyl pyrophosphate phase. It is used as the catalyst for air oxidizing n-butane to prepare cis-butenedioic anhydride and has one single-path conversion rate of 33-51 % and cis-butenedioic anhydride selectivity of 61-87 % in the typical temperature range of 380-400 deg.c.

Description

1. Technical field [0001] The invention relates to a supported vanadium phosphorus oxide catalyst and preparing maleic anhydride by catalytically oxidizing n-butane with air on the catalyst. 2. Technical background [0002] Maleic anhydride, referred to as maleic anhydride, also known as maleic anhydride, is an important chemical raw material, which can be used to produce nearly 100 kinds of unsaturated polyester resins, fumaric anhydride, lubricating oil additives, heat-resistant styrene resins, etc. Downstream fine chemical intermediates and specialty chemicals are also raw materials for the production of high value-added fine chemicals such as 1,4-butanediol, tetrahydrofuran, γ-butyrolactone, etc. At present, its application range is still expanding[see Catal. Rev.-Sci. Eng., 27(1985) 373 and Chem. Rev., 88(1988) 50]. [0003] The early production of maleic anhydride has been using V 2 o 5 -MoO 3 The catalyst was prepared by selective oxidation of benzene. Later, a p...

Claims

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Application Information

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IPC IPC(8): B01J31/36C07C51/215C07C57/145
Inventor 季伟捷陈熙王中玉陈懿
Owner NANJING UNIV
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