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Nano perovskite catalyst la 1-x bi x coo 3 And its preparation method and application

A technology of catalyst and nano-calcium, which is applied in the direction of chemical instruments and methods, physical/chemical process catalysts, heterogeneous catalyst chemical elements, etc., and can solve problems such as difficult to remove

Active Publication Date: 2021-02-26
FUDAN UNIV +1
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  • Application Information

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Problems solved by technology

For the recycle gas of the glyoxal production process, its oxygen content is only about 6%, and the catalyst disclosed in this patent is difficult to remove the volatile organic compounds, and it is necessary to develop a catalyst with high activity under low oxygen content

Method used

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Embodiment Construction

[0015] The present invention will be further elaborated below by embodiment:

[0016] The catalytic combustion reactor used to purify the cycle gas is installed in the cycle gas path of glyoxal production, and the reactor is installed before the cycle gas and ethylene glycol raw materials are mixed. The circulating gas purification catalyst is loaded in the reactor, the circulating gas temperature is 300-350°C, and the circulating gas space velocity is 1000h -1 . The performance of the catalyst is expressed by the conversion rate of the complete oxidation of organic matter in the cycle gas. When the conversion rate reaches 100%, all the organic matter in the cycle gas is oxidized into carbon dioxide.

[0017] Nanoscale perovskite catalyst La 1-X Bi X CoO 3 The specific steps of preparation are as follows:

[0018] (1) According to La 1-X Bi X CoO 3 The value of X in (respectively X=0.05, 0.10, 0.15, 0.20, 0.25, 0.30), the weighing ratio takes a certain amount of lantha...

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Abstract

The invention belongs to the technical field of chemical catalysts, specifically an ABO 3 type nano perovskite catalyst La 1‑X Bi X CoO 3 And its preparation method and application. The present invention mixes lanthanum nitrate, cobalt nitrate and bismuth nitrate with sucrose and citric acid, adjusts the solution to neutral, forms a gel, and then heat-treats it under a nitrogen atmosphere to prepare nano La 1‑ X Bi X CoO 3 perovskite catalysts. The catalyst prepared by the invention has good activity and stability, and can be used for the purification of circulating gas in the process of producing glyoxal by air oxidation of ethylene glycol. Oxidize the organic matter in the circulating gas to achieve the purpose of purifying the circulating gas.

Description

technical field [0001] The invention belongs to the technical field of chemical catalysts, in particular to a nanometer perovskite catalyst La 1-X Bi X CoO 3 and its preparation methods and applications. Background technique [0002] Glyoxal has important uses in many industries such as textiles, pharmaceuticals, microelectronics, and aerospace. Its mainstream production method is to use an adiabatic bed reactor, and ethylene glycol and air are carried out at 400-600 ° C on silver or silver-copper catalysts. Partial oxidation reaction of ethylene glycol, the product is absorbed by water to obtain a glyoxal aqueous solution product with a weight solubility of 40%. The reaction of partial oxidation of ethylene glycol to form glyoxal is a strong exothermic reaction. In order to maintain a stable reaction temperature, part of the nitrogen in the product gas after the reaction should be circulated in the system as a heat transfer gas, so there is always a cycle during the reac...

Claims

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Application Information

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IPC IPC(8): B01J23/843F23G7/07
CPCB01J23/002B01J23/8437B01J2523/00F23G7/07B01J2523/3706B01J2523/54B01J2523/845
Inventor 徐华龙沈伟秦枫孙文杰尹国平邓支华汪林涛付义发周拥军
Owner FUDAN UNIV
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