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A kind of iron oxide catalyst and its preparation and application

A technology of catalyst and iron oxide, which is applied in the direction of physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, organic compound preparation, etc. It can solve the problems of poor stability and achieve high conversion rate and good propane The effect of acid selectivity and simple preparation method

Inactive Publication Date: 2019-01-04
CHINA WEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Recently, Green Chemistry (Green Chemistry, USA, 2013, 15, 982) reported a case of molybdenum-based catalysts catalyzing the deoxygenation of lactic acid to prepare propionic acid, but heteropolyacids containing molybdenum have poor stability at high temperatures

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  • A kind of iron oxide catalyst and its preparation and application
  • A kind of iron oxide catalyst and its preparation and application
  • A kind of iron oxide catalyst and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] figure 1 This is a diagram of the pore structure of the catalyst prepared by using ferric nitrate as an iron source in the present invention. The specific experimental steps are as follows: first, weigh 8.08g of nonahydrate ferric nitrate and fully dissolve it in 100ml of deionized water. Use 25-28% ammonia water as a precipitating agent, adjust the pH to about 8-9, continue stirring at room temperature for 1 hour, stop stirring for 2 hours, filter with suction, wash with deionized water for 3-5 times, and dry by blowing Dry at 120℃. In an air atmosphere, the temperature was programmed to 500°C and calcined for 6 hours. The obtained iron oxide is tableted and granulated, and 20-40 mesh is taken as a catalyst for use. A quartz tube with a length of 400mm and an inner diameter of 3mm is selected, and 0.44g of the above-mentioned spare catalyst is filled in the quartz tube. The length of the catalyst in the tube is 30mm. The two ends of the catalyst are terminated with qua...

Embodiment 2

[0034] First, weigh 8.00 g of iron sulfate (without crystal water) and fully dissolve it in 100 ml of deionized water. Use 25-28% ammonia water as a precipitating agent, adjust the pH to about 8-9, continue stirring at room temperature for 1 hour, stop stirring for 2 hours, filter with suction, wash with deionized water for 3-5 times, and dry by blowing Dry at 120℃. In an air atmosphere, the temperature was programmed to 500°C and calcined for 6 hours. The obtained iron oxide is tableted and granulated, and 20-40 mesh is taken as a catalyst for use. A quartz tube with a length of 400mm and an inner diameter of 3mm is selected, and 0.44g of the above-mentioned spare catalyst is filled in the quartz tube. The length of the catalyst in the tube is 30mm. The two ends of the catalyst are terminated with quartz wool. The length of the quartz wool is 30mm. . The aqueous lactic acid solution was carried by nitrogen through the above-mentioned quartz tube filled with the catalyst, th...

Embodiment 3

[0037] First, weigh 8.00 g of iron sulfate (without crystal water) and fully dissolve it in 100 ml of deionized water. Use ethylenediamine as a precipitant, adjust the pH to about 8-9, continue stirring at room temperature for 1h, stop stirring for 2h, filter with suction, wash with deionized water for 3-5 times, and place in a blast drying oven at 120°C. dry. In an air atmosphere, the temperature is programmed to 500°C and calcined for 6 hours. The obtained iron oxide is tableted and granulated, and 20-40 mesh is taken as a catalyst for use. A quartz tube with a length of 400mm and an inner diameter of 3mm is selected, and 0.13g of the above-mentioned spare catalyst is filled in the quartz tube. The length of the catalyst in the tube is 30mm. The two ends of the catalyst are terminated with quartz wool. The length of the quartz wool is 30mm. . The aqueous lactic acid solution was carried by nitrogen through the above-mentioned quartz tube filled with the catalyst, the temper...

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Abstract

The invention discloses an iron oxide catalyst, a preparation method therefor and an application of the iron oxide catalyst in a process for preparing propanoic acid through lactic acid deoxidation. The iron oxide catalyst is obtained through synthesizing iron hydroxide by taking dissoluble +3 iron salts such as ferric nitrate and ferric sulfate as an iron source and taking ammonia water or organic amine as a precipitant, then, carrying out drying at the temperature of 100 DEG C to 120 DEG C, carrying out calcining at the temperature of 500 DEG C to 650 DEG C, and carrying out dehydrating. Lactic acid obtained through fermenting biomass serves as a raw material, the reaction temperature is 320 DEG C to 420 DEG C, the reaction is carried out at normal pressure, carrier gas carries the raw material, the propanoic acid is synthesized in a high-temperature gas-solid catalysis mode, and the adopted catalyst is iron oxide. The iron oxide catalyst is simple to prepare, is green and environment-friendly and is low in cost, high in catalytic activity, good in stability, high in propanoic acid selectivity and high in lactic acid conversion ratio; and after the activity of the catalyst is lowered, the catalyst can be regenerated through simple high-temperature air atmosphere calcination, so that the catalyst has a very high commercial development value.

Description

Technical field [0001] The invention belongs to the technical field of energy and chemical industry, and specifically relates to an iron oxide catalyst and its preparation and application. Background technique [0002] Propionic acid, a colorless transparent liquid with a pungent odor, soluble in water. Propionic acid is an important intermediate in chemical production, and it is widely used in the production of pesticides, food, plastics, etc. Propionic acid can react to form salts, esters, acid chlorides, amides, acid anhydrides, etc., and can also undergo chlorination reactions, acetal reactions and carboxyl group reduction reactions. [0003] There are three main methods for preparing propionic acid: [0004] (1) Hydrocarboxylation of ethylene [0005] [0006] (2) Oxidation reaction of propionaldehyde [0007] [0008] (3) Deoxygenation reaction of lactic acid (Green Chemistry, USA, 2013, 15, 982) [0009] [0010] The comparison of the first three propionic acid preparation proc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/745C07C51/377C07C53/122
CPCY02P20/584
Inventor 唐聪明翟占杰李新利张瑜孙良伟
Owner CHINA WEST NORMAL UNIVERSITY
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