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Propylene gas-phase epoxidation catalyst used at ordinary pressure and preparation method of catalyst

A catalyst and epoxidation technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical instrument and method, etc., can solve the problem of high reaction pressure, achieve high activity and save energy and cost, cost reduction effect

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

Publication number CN104128176AY discloses the synthesis of TiO by ultrasonic impregnation method 2 Modified MoO 3 -Bi 2 SiO 5 / SiO 2 Catalyst, at a pressure of 0.15 MPa and a temperature of 400 °C, a propylene conversion of 22.8% and a selectivity of PO of 65.2% were obtained, but the catalyst also has the problem of too high reaction pressure, and the yield of PO needs to be further improved

Method used

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Examples

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Embodiment 1

[0020] Example 1: Bi 2 SiO 5 / SiO 2 Synthesis of carrier: publication number CN101229510A discloses a bismuth-containing bismuth silicate (Bi) with mesoporous characteristics synthesized by hydrothermal method 2 SiO 5 ) Catalytic material, carrier Bi 2 SiO 5 / SiO 2Synthesize according to its synthesis steps.

[0021] Catalyst Fe 2 o 3 -MoO 3 -Bi 2 SiO 5 / SiO 2 Preparation of (Si / Bi=50, Mo / Bi=2, Fe / Mo=0.1): Weigh about 80 g of the above Bi 2 SiO 5 / SiO 2 The carrier was dispersed by adding 500 ml of deionized water, and stirred in an ice-water bath for 0.5 h; 1.82 g of ferric ammonium EDTA was weighed and dissolved in 500 mL of deionized water according to the molar ratio Fe / Mo=0.1, and added dropwise to Add the above carrier powder slurry, and continue stirring for 0.5 h in an ice-water bath environment; then weigh 8.08 g of molybdic acid according to the molar ratio Mo / Bi=2, dissolve it in 500 mL deionized water, add it dropwise to the above slurry, and Stir i...

Embodiment 2

[0023] Embodiment 2: as the catalyst system of embodiment 1, but according to Mo / Bi=5, the mol ratio of Fe / Mo=0.2 prepares catalyst Fe 2 o 3 -MoO 3 -Bi 2 SiO 5 / SiO 2 , and the molybdenum precursor is ammonium paramolybdate, and the iron precursor is ferric ammonium citrate; the stirring condition for loading the active component is -10 ℃ for 2 h, and the ultrasonic impregnation condition is -10 ℃ for 2 h with ultrasonic vibration. The obtained samples were dried at 80 °C for 5 h, ground and calcined at 400 °C for 15 h, and other reaction conditions were the same as in Example 1. The results of the epoxidation reaction are shown in Table 1.

Embodiment 3

[0024] Example 3: The catalyst system as in Example 1, but the iron precursor is iron acetylacetonate. When loading the active components, the stirring condition is 20 °C for 8 h, and the ultrasonic impregnation condition is 20 °C ultrasonic vibration impregnation for 10 h, the impregnated The resulting slurry was dried at 120 °C for 20 h, and the resulting particles were calcined at 550 °C for 8 h after drying. When evaluating the epoxidation activity, the reaction temperature was 400°C, the pressure was 0.2 MPa, air was used as the oxygen source, and the air purity was greater than 99.9%. Fujian Xinhang Industrial Gas Co., Ltd., and other reaction conditions were the same as in Example 1. The results of the epoxidation reaction are shown in Table 1.

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Abstract

The invention discloses a catalyst Fe2O3-MoO3-Bi2SiO5 / SiO2 for preparing propylene epoxide by propylene gas-phase epoxidation at ordinary pressure and a preparation method of the catalyst. The catalyst is applied to a reaction of preparing propylene epoxide from air, molecular oxygen or N2O as an oxidizing agent by the propylene gas-phase epoxidation, the reaction conditions are mild, inhibitors are not required, and the catalyst has higher catalytic activity. The catalyst adopts a Bi2SiO5-containing SiO2 mesoporous material Bi2SiO5 / SiO2 as a supporter, MoO3 as an active component and Fe2O3 asan auxiliary, and in terms of mole composition of the catalyst, Si / Bi is 50, Mo / Bi is 1-10, and Fe / Mo is 0.05-1. The supporter Bi2SiO5 / SiO2 is synthesized with a hydrothermal method, the active component MoO3 and the auxiliary iron oxide impregnate Mo and Fe precursor to the supporter with an ultrasonic assisted impregnation method, and the catalyst is prepared.

Description

technical field [0001] The invention belongs to the field of preparation methods of petrochemical catalysts, and more specifically relates to a propylene oxide catalyst 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, or PO for short, is an important chemical 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 hydrogen peroxide direct oxidation method (HPPO method). The chlorohydrin method has been developed and industrialized by the UCC company of the United States since the 1930s. It has the advantages of mature technology, good selectivity, and simple process. However, this process will produce a large amount of chlorine-containing by-products and organic wastewater in the production process. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/887C07D301/03C07D301/08C07D303/04
CPCB01J23/8876C07D301/03C07D301/08C07D303/04Y02P20/52
Inventor 陈晓晖高阿龙胡晖黄清明
Owner FUZHOU UNIV
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