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Molybdenum-based catalyst, preparation method and application thereof

A molybdenum-based catalyst, catalyst technology, applied in catalyst activation/preparation, chemical instruments and methods, preparation of organic compounds, etc., can solve problems such as less propionic acid work, achieve improved hydrogenolysis capacity, high commercial development value, stable long term effect

Active Publication Date: 2020-11-24
CHONGQING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there is less work on the synthesis of propionic acid from lactic acid

Method used

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  • Molybdenum-based catalyst, preparation method and application thereof
  • Molybdenum-based catalyst, preparation method and application thereof
  • Molybdenum-based catalyst, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Take 0.72g molybdenum trioxide and add 15mL H 2 o 2 – Fully stir in the mixed solution of ethanol (volume ratio: 1:1) for 30 minutes, raise the temperature to 60°C and then add 0.12 g of egg whites after the solution turns yellow, continue stirring for 1 hour, stop stirring, raise the temperature to 100°C and steam dry to obtain the corresponding catalyst precursor. A quartz tube with a length of 400 mm and an inner diameter of 4 mm was selected, and 0.50 g of the above spare catalyst was packed into the quartz tube. The length of the catalyst in the tube was 30 mm, and both ends of the catalyst were sealed with quartz wool. After the catalyst is loaded and the fixed bed reactor is installed, the carrier gas is turned on, and the temperature of the fixed bed is raised to 390°C at a rate of 8°C / min. After stabilizing for 30 minutes, materials are introduced into the reactor. The nitrogen gas carries the lactic acid aqueous solution through the above-mentioned quartz tu...

Embodiment 2

[0034] Take 0.88g ammonium molybdate and add 15mL H 2 o 2 – Fully stir in the mixed solution of ethanol (volume ratio 1:1) for 30 minutes, the solution turns yellow, raise the temperature to 60°C, add 0.12g protein, continue stirring for 1 hour, stop stirring, raise the temperature to 100°C and evaporate to dryness , that is, the corresponding catalyst precursor is obtained. A quartz tube with a length of 400 mm and an inner diameter of 4 mm was selected, and 0.20 g of the above spare catalyst was loaded into the quartz tube. The length of the catalyst in the tube was 30 mm, and both ends of the catalyst were sealed with quartz wool. After the catalyst is filled and the fixed-bed reactor is installed, the carrier gas is turned on, and the temperature of the fixed bed is raised to 390°C at a rate of 8°C / min. After 30 minutes of stabilization, materials are introduced into the reactor. The nitrogen gas carries the lactic acid aqueous solution through the above-mentioned quartz...

Embodiment 3

[0036] Take 0.76g phosphomolybdic acid and add 15mL H 2 o 2 – Fully stir in the mixed solution of ethanol (volume ratio 1:1) for 30 minutes, the solution turns yellow, raise the temperature to 60°C, add 0.12g protein, continue stirring for 1 hour, stop stirring, raise the temperature to 100°C and evaporate to dryness , that is, the corresponding catalyst precursor is obtained. A quartz tube with a length of 400 mm and an inner diameter of 4 mm was selected, and 0.20 g of the above spare catalyst was loaded into the quartz tube. The length of the catalyst in the tube was 30 mm, and both ends of the catalyst were sealed with quartz wool. After the catalyst is filled and the fixed-bed reactor is installed, the carrier gas is turned on, and the temperature of the fixed bed is raised to 390°C at a rate of 8°C / min. After 30 minutes of stabilization, materials are introduced into the reactor. The nitrogen gas carries the lactic acid aqueous solution through the above-mentioned quar...

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Abstract

The invention relates to the technical field of catalytic materials, and in particular relates to a molybdenum-based catalyst, and a preparation method and application thereof. The preparation methodof the molybdenum-based catalyst comprises the following steps: adding a molybdenum source into an H2O2 / CH3CH2OH mixed solution, and carrying out stirring to form a reaction system; heating the reaction system to 50-70 DEG C, adding a protein assistant, continuously carrying out stirring, and then evaporating water and ethanol at a temperature of 80-100 DEG C to obtain a catalyst precursor; and filling the catalyst precursor under a nitrogen atmosphere, carrying out heating to 300-450 DEG C, then introducing mixed steam of lactic acid and water into the catalyst precursor, and reducing the catalyst precursor to prepare the molybdenum-based catalyst. The molybdenum-based catalyst prepared by the method is simple to prepare, and the catalyst is clean and non-toxic, is high in catalytic activity, good in stability and low in cost, and has a potential commercial development value.

Description

technical field [0001] The invention relates to the technical field of catalytic materials, in particular to molybdenum-based catalysts, preparation methods and applications thereof. Background technique [0002] Propionic acid is mainly used as food preservative and antifungal agent, viscous substance inhibitor in beer, nitrocellulose solvent and plasticizer. In addition, it can also be used in the preparation of nickel plating solution, the preparation of food spices and the manufacture of medicines and pesticides. With the development of industrial society, the demand for propionic acid is increasing day by day. So far, the chemical synthesis methods of propionic acid mainly include: propionaldehyde oxidation method, propionitrile hydrolysis method, acrylic acid hydrogenation synthesis method, ethanol carbonylation method, etc. The synthesis of natural propionic acid mainly adopts fermentation method, but the yield of propionic acid is low and the separation cost is hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/28B01J27/19B01J31/34B01J37/16C07C53/122C07C51/377
CPCB01J23/28B01J27/19B01J31/34B01J37/16C07C51/377C07C53/122
Inventor 唐聪明庞均陈志全学军李新利张菊曹平
Owner CHONGQING UNIV OF TECH
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