High-activity propylene gas-phase epoxidation catalyst and preparation method thereof

A catalyst and high-activity technology, applied in the direction of heterogeneous catalyst chemical elements, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of low PO yield and achieve cost and The effect of less environmental pollution and easy industrialization

Pending Publication Date: 2020-06-26
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 co-impregnation 2 Modified MoO 3 -Bi 2 SiO 5 / SiO 2 Catalyst, at a reaction pressure of 0.15 MPa and a temperature of 400 °C, a propylene conversion rate of 22.8% and a PO selectivity of 65.2% were obtained, but the catalyst also has the problem of low PO yield and selectivity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: Bi 2 SiO 5 Synthesis of nanosheets: Weigh 200 mmol of bismuth nitrate and dissolve in 1000 ml of ethylene glycol-glycerol-water mixed solution, and stir for 1 h, then weigh 100 mmol of tetraethyl orthosilicate and dissolve in ethanol solution and added dropwise to the above solution, continued to stir for 1 h, then added 1000 ml of deionized water; then adjusted the pH to 9 with 28% ammonia water, and then transferred the obtained white emulsion to a 180 °C oven for crystallization for 12 h , followed by centrifugation and washing to pH = 7, the obtained white solid was dried at 70 °C for 10 h, and the obtained sample was ground and calcined at 500 °C for 4 h to obtain the carrier nanosheet Bi 2 SiO 5 .

[0020] Catalyst Fe 2 o 3 -MoO 3 -Bi 2 SiO 5(Molar ratio Si / Bi=0.5, Mo / Bi=0.15, Fe / Mo=0.3) preparation: weigh 50 g of the above Bi 2 SiO 5 The nanosheets were dispersed in 500 ml of deionized water and stirred in an ice-water bath for 0.5 h; Mo / Bi=0...

Embodiment 2

[0022] Example 2: The catalyst system as in Example 1, but using sodium silicate as the silicon source and bismuth chloride as the bismuth source, crystallized at 140 °C for 4 h, and dried the resulting white solid at 110 °C for 4 h to prepare Bi 2 SiO 5 Nanosheets, according to the molar ratio of Mo / Bi=0.02, Fe / Mo=0.06 to prepare catalyst Fe 2 o 3 -MoO 3 -Bi 2 SiO 5 The stirring condition when loading the active components was stirring in an ice-water bath for 3 h, the obtained sample was dried at 70 °C for 4 h, ground and roasted at 450 °C for 20 h, other reaction conditions were the same as in Example 1. The results of the epoxidation reaction are shown in Table 1.

Embodiment 3

[0023] Embodiment 3: as the catalyst system of embodiment 1, but prepare Fe according to the ratio of molar ratio Si / Bi=0.1, Mo / Bi=0.3, Fe / Mo=0.5 2 o 3 -MoO 3 -Bi 2 SiO 5 , when the active component is loaded, ammonium molybdate is used as the molybdenum precursor and the stirring condition is stirring in an ice-water bath for 5 h, and the ultrasonic impregnation condition is ultrasonic vibration impregnation for 3 h, and the slurry obtained after stirring is dried at 180 °C for 3 h, and the particles are ground Then baked at 550 °C for 5 h. When evaluating the epoxidation activity, the reaction temperature is 400 °C, the pressure is 0.15 MPa, and the reaction temperature is 0.15 MPa. 2 O is the source of oxygen, N 2 O purity is greater than 99.9%, Fujian Xinhang Industrial Gas Co., Ltd., and other reaction conditions are the same as embodiment 1. The results of the epoxidation reaction are shown in Table 1.

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Abstract

The invention discloses a high-activity catalyst Fe2O3-MoO3-Bi2SiO5 for preparing epoxypropane through gas-phase epoxidation of propylene and a preparation method thereof. The catalyst is used in a reaction for preparing epoxypropane through propylene gas-phase epoxidation by taking air, molecular oxygen or N2O as an oxidizing agent, the reaction condition is mild, no inhibitor is added, and the catalyst has relatively high catalytic activity. According to the catalyst, Bi2SiO5 nanosheets serve as a carrier, MoO3 serves as an active component, Fe2O3 serves as an auxiliary, the Si / Bi mole ratiois 0.1-1, the Mo / Bi mole ratio is 0.01-1, and the Fe / Mo mole ratio is 0.05-1. The carrier Bi2SiO5 nanosheet is synthesized by adopting a hydrothermal method, and for the active component MoO3 and theauxiliary agent iron oxide, molybdenum and iron precursors are impregnated on the carrier by adopting an ultrasonic-assisted impregnation method to prepare the catalyst.

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, referred to as PO, also known as methyl oxirane or propylene oxide, is a colorless, volatile liquid with ether-like odor. Propylene oxide is an important chemical raw material. Among propylene derivatives, it is the third largest derivative after polypropylene and acrylonitrile, and it is also one of the top 50 chemicals in the world. Propylene oxide is mainly used to produce polyether polyol, and further processed into soft and hard polyurethane foam, also used to produce propylene glycol, dipropylene glycol, etc., and can also be used to produce hydroxycellulose, etc. Industrial and other industries are w...

Claims

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Application Information

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IPC IPC(8): B01J23/887C07D303/04C07D301/08
CPCB01J23/8876B01J23/002C07D303/04C07D301/08B01J2523/00B01J35/23B01J2523/41B01J2523/54B01J2523/68B01J2523/842Y02P20/52
Inventor 陈晓晖高阿龙黄清明冯浪胡晖
Owner FUZHOU UNIV
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