Propylene gas-phase epoxidation catalyst used at low temperature and preparation method of catalyst

An epoxidation and catalyst technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problem of high cost, decreased reaction temperature activity, and high reaction temperature problems, to achieve the effect of less cost and environmental pollution, easy industrialization, and simple operation

Inactive Publication Date: 2018-11-16
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With TS-1 molecular sieve as catalyst, the reaction conditions are mild and the PO yield is high, but due to TS-1 and H 2 o 2 The cost is higher, and H 2 o 2 There are potential safety hazards in storage and transportation, which limits its industrialization process to a certain extent.
M. Haruta et al. (Journal of Catalysis, 1998, 178(2): 566-575) synthesized Au/TiO by deposition-precipitation method for the first time 2 Catalyst, in H 2 with O 2 Under coexistence conditions, a PO selectivity as high as 93% was obtained, but the conversion of propylene was less than 2.5%
Authorized patent CN104128176 B discloses a catalyst TiO for the production of propylene oxide b

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: Catalyst CuO X -MoO 3 -Bi 2 SiO 5 / SiO 2 (Mo / Bi=2, Cu / Mo=0.1) preparation. The preparation of the carrier adopts the method of the patent CN104128176 B of our research group, taking 160 g of the above-mentioned Bi 2 SiO 5 / SiO 2 Carrier, dispersed in 500ml of absolute ethanol, stirred in an ice-water bath for 0.5 h, weighed 16.16 g of molybdic acid according to the molar ratio Mo / Bi=2, fully dissolved in 200 ml of deionized water, added dropwise to the carrier dispersion, and massaged Mole ratio Cu / Mo=0.1 Weigh 2 g of copper acetate and dissolve it in 300 mL of absolute ethanol, then add dropwise to the above carrier dispersion, stir in an ice-water bath for 1 h to form a uniform slurry, and then place the slurry in a container In an ultrasonic cleaner with an ice-water bath, perform ultrasonic vibration and impregnation treatment for 1 h; then transfer to 110 ° C for 12 h vacuum drying, and the obtained sample is ground and calcined at 500 ° C for ...

Embodiment 2

[0020] Embodiment 2: as the catalyst system of embodiment 1, the molybdenum precursor used is ammonium molybdate, and the Cu precursor is copper nitrate, and the amount of substance of the precursor used is all the same as embodiment 1, and the ultrasonic wave during the load active component The shaking impregnation condition was 3 h at 30 °C, the drying conditions of the sample loaded with active metals were vacuum drying at 80 °C for 12 h, grinding and roasting at 550 °C for 8 h, the ultrasonic impregnation time was 3 h, and the reaction temperature was 350 °C. Other reaction conditions are with embodiment 1. The results of the epoxidation reaction are shown in Table 1.

Embodiment 3

[0021] Embodiment 3: Catalyst system as embodiment 1, but be Mo / Bi=3 by element molar ratio, the proportioning ratio of Cu / Mo=0.1 prepares catalyst CuOx-MoO 3 -Bi 2 SiO 5 / SiO 2 , the copper precursor is copper oxalate, and the molybdenum precursor is made of ammonium molybdate. The ultrasonic vibration impregnation condition for loading active components is 60°C for 3 h, the dispersing carrier and the solvent for dissolving the copper precursor are distilled water, and the reaction temperature is 300°C. Other reaction conditions are with embodiment 1. The content of each component in the catalyst is by mass percentage, and the carrier Bi 2 SiO 5 / SiO 2 81.6%, MoO 3 is 17.6%, and CuOx is 0.8%. The results of the epoxidation reaction are shown in Table 1.

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Abstract

The invention discloses a catalyst CuOX-MoO3-Bi2SiO5/SiO2 for preparing propylene epoxide by propylene gas-phase epoxidation at the low temperature and a preparation method of the catalyst. The catalyst is applied to a reaction of preparing propylene epoxide from molecular oxygen (O2) or air as an oxidizing agent by the propylene gas-phase epoxidation, the reaction conditions are mild, inhibitorsare not required, and the catalyst keeps higher catalytic activity at the temperature of 300-380 DEG C. The catalyst adopts Bi2SiO5/SiO2 as a supporter, MoO3 as an active component and Cu as a modification aid, and is prepared from the components in percentage by mass as follows: 75.0%-95.0% of the supporter Bi2SiO5/SiO2, 4.2%-21.0% of MoO3 and 0.8%-4.0% of CuOX. A mole ratio of Si to Bi in the supporter Bi2SiO5/SiO2 is 50, the supporter Bi2SiO5/SiO2 is synthesized with a hydrothermal method, the active component MoO3 and the aid Cu impregnate Mo and Fe precursor to the supporter with an ultrasonic assisted co-impregnation method, and the catalyst is prepared accordingly.

Description

technical field [0001] The invention belongs to the field of petrochemical catalyst preparation methods, and more specifically relates to a catalyst for preparing propylene oxide and a preparation method thereof, especially a catalyst for preparing propylene oxide by gas-phase epoxidation of propylene and a preparation method thereof. Background technique [0002] Propylene oxide, referred to as PO, is an important chemical raw material, a very important organic compound raw material, and the third largest propylene derivative after polypropylene and acrylonitrile. At present, the main methods of producing PO in industry are chlorohydrin method and co-oxidation method. Moreover, the chlorohydrin method is still the main production method of PO, which has the advantages of low investment, good selectivity, high efficiency, and large operating flexibility. However, the hypochlorous acid produced during the production process of this process severely corrodes equipment and prod...

Claims

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Application Information

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IPC IPC(8): B01J23/887C07D301/08C07D303/04
CPCB01J23/8876C07D301/08C07D303/04Y02P20/52
Inventor 陈晓晖王志勇胡晖
Owner FUZHOU UNIV
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