Dolomite-molybdenum trioxide composite catalyst for preparing acrolein through glycerol dehydration and preparation method of dolomite-molybdenum trioxide composite catalyst

A technology of composite catalyst and dolomite, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical instrument and method, etc., to achieve the effect of low price, simple process equipment and good technical achievements

Pending Publication Date: 2022-03-11
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the deactivation problem of the catalyst in the conversion of glycerin to acrolein, the present invention provides a dolomite-MoO 3 Composite catalyst and preparation method thereof, the catalyst has the advantages of high activity, anti-coking, cheap and easy-to-obtain raw materials and simple operation, etc.

Method used

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  • Dolomite-molybdenum trioxide composite catalyst for preparing acrolein through glycerol dehydration and preparation method of dolomite-molybdenum trioxide composite catalyst
  • Dolomite-molybdenum trioxide composite catalyst for preparing acrolein through glycerol dehydration and preparation method of dolomite-molybdenum trioxide composite catalyst

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Experimental program
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Effect test

Embodiment 1

[0034] 20 g of natural dolomite, grinding 60-80 mesh, washed with ethanol, then placed in an oven at 80 ° C for 4 hours to dry it, to obtain a dolomite catalyst, remember to Natural Dolomite.

Embodiment 2

[0036] 20g of 20 g of natural dolomite, ground to 60-80 mesh, washed with ethanol, then put it in an oven at 80 ° C to dry it, and the dried dolomite particles were put into the muffle furnace. Under the 5 ° C / min heating procedure, 700 calcined at 700 ° C for 4 h, resulting in calcination of dolomite, and remembered 700D.

Embodiment 3

[0038] 20g of 20 g of natural dolomite, ground to 60-80 mesh, washed with ethanol, then put it in an oven at 80 ° C to dry it, and the dried dolomite particles were put into the muffle furnace. Under the 5 ° C / min heating procedure, 700 ° C is calcined at 700 to obtain calcined dolomite. Accurately, 0.1000 g of four hydrated molybdate is placed in a 50 ml beaker, add 10 ml of deionized water, stirring it completely dissolved with glass rod, then weighing 4 g is calcined at 700 ° C, added to the above solution, mixed After stirring for 4 h on a magnetic stirrer, stirring at a rate of 300r / min, stirred after 24 h, and then placed in an oven at 80 ° C for 12 h, and finally, the dried sample was placed in a muffle, calcined at 700 ° C. , Temperature rise procedure 10 ° C / min, calcined for 4 h, obtained Dolomite-MOO 3 Composite catalysts contain 2 wt.% MOO 3 Remember 2 wt.% MO-700D.

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Abstract

The invention discloses a dolomite-molybdenum trioxide composite catalyst for preparing acrolein by glycerol dehydration and a preparation method thereof, and the method comprises the following steps: crushing, grinding, washing and drying natural dolomite, putting into a muffle furnace, heating to 500-700 DEG C, and calcining for 4 hours to obtain calcined dolomite; ammonium molybdate tetrahydrate is dissolved in deionized water, and an ammonium molybdate tetrahydrate solution is obtained; adding the calcined dolomite into an ammonium molybdate tetrahydrate solution, stirring for 4-6 hours, dipping for 24-36 hours, drying in a drying oven, heating to 700 DEG C in a muffle furnace, and calcining for 4 hours, so as to obtain the product. The method is simple in operation method, low in price, clean, efficient and environment-friendly, the required process equipment is also very simple, the time cost can be reduced, and the method is very suitable for large-scale production; by adopting the catalyst disclosed by the invention, the selectivity of acrolein can reach more than 50%, and the catalyst has certain carbon deposition resistance, so that a better technical achievement is achieved.

Description

Technical field [0001] The present invention relates to a dolomite for glycerol dehydration preparing acrolein-MOO 3 Composite catalyst and preparation method thereof. Background technique [0002] Due to the shortage of fossil fuels and a large number of environmental and ecological problems, people will force people to seek green resources and sustainable chemical processes. As a potential renewable energy source, biodiesel can be produced by vegetable oil or animal fat with alcohol of alcohol, and 10 wt.% Glycerol by-product is produced during this process. Therefore, finding a method of converting a large amount of glycerin into a high value-added chemical, making it a necessary condition for its industrialization. At present, there are many ways to convert glycerol into high value-added chemical products, such as oxidation, hydrogenolysis, esterification, etherification, polymerization, carboxylation, and reduction, where the catalyzed glycerol dehydration is prepared to ach...

Claims

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Application Information

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IPC IPC(8): B01J23/28C07C45/52C07C47/22
CPCB01J23/28C07C45/52C07C47/22
Inventor 周春晖朱保
Owner ZHEJIANG UNIV OF TECH
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