Metal-loaded dolomite catalyst for preparing ethanol by glycerol dehydration and preparation method thereof

A technology for supporting metal and dolomite, which is applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve the problems of explosion and high cost, and achieve simple operation method, Save time, cost and low price

Active Publication Date: 2021-03-30
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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Method used

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  • Metal-loaded dolomite catalyst for preparing ethanol by glycerol dehydration and preparation method thereof
  • Metal-loaded dolomite catalyst for preparing ethanol by glycerol dehydration and preparation method thereof
  • Metal-loaded dolomite catalyst for preparing ethanol by glycerol dehydration and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Weigh 10g of natural dolomite, grind it to 60-80 mesh, wash with ethanol, then put it in an oven at 80°C for 4h to dry it, put the dried dolomite particles into the muffle furnace, Calcined at 900° C. for 4 hours under a heating program of 5° C. / min to obtain a calcined dolomite catalyst. Weigh 0.204g of copper nitrate and place it in a 50ml beaker, add 10ml of deionized water, stir it with a glass rod to dissolve it completely, then weigh 10g of calcined dolomite at 900°C as a carrier, add it to the above solution, mix Put it on a magnetic stirrer and stir for 4 hours at a stirring speed of 300r / min. After stirring, impregnate for 24 hours, put it in an oven at 80°C for 12 hours at a constant temperature, and finally put the dried sample into a muffle furnace for calcination at 900°C. The heating program was 10°C / min and calcined for 4 hours to obtain a 2wt.% copper catalyst supported on calcined dolomite, which was recorded as 2wt% CuO-CD900. The catalytic activity is...

Embodiment 2

[0036] Weigh 10g of natural dolomite, grind it to 60-80 mesh, wash with ethanol, then put it in an oven at 80°C for 4h to dry it, put the dried dolomite particles into the muffle furnace, Calcined at 900° C. for 4 hours under a heating program of 5° C. / min to obtain a calcined dolomite catalyst. Weigh 0.638g of copper nitrate and place it in a 50ml beaker, add 10ml of deionized water, stir it with a glass rod to dissolve it completely, then weigh 10g of calcined dolomite at 900°C as a carrier, add it to the above solution, and mix Put it on a magnetic stirrer and stir for 4 hours at a stirring speed of 300r / min. After stirring, impregnate for 24 hours, put it in an oven at 80°C for 12 hours at a constant temperature, and finally put the dried sample into a muffle furnace for calcination at 900°C. The heating program was 10°C / min, and calcined for 4 hours to obtain a 6wt.% copper catalyst supported on calcined dolomite, denoted as 6wt% CuO-CD900. The catalytic activity is shown...

Embodiment 3

[0038] Weigh 10g of natural dolomite, grind it to 60-80 mesh, wash with ethanol, then put it in an oven at 80°C for 4h to dry it, put the dried dolomite particles into the muffle furnace, Calcined at 900° C. for 4 hours under a heating program of 5° C. / min to obtain a calcined dolomite catalyst. Weigh 1.111g of copper nitrate and place it in a 50ml beaker, add 10ml of deionized water, stir it with a glass rod to dissolve it completely, then weigh 10g of calcined dolomite at 900°C as a carrier, add it to the above solution, mix Put it on a magnetic stirrer and stir for 4 hours at a stirring speed of 300r / min. After stirring, impregnate for 24 hours, put it in an oven at 80°C for 12 hours at a constant temperature, and finally put the dried sample into a muffle furnace for calcination at 900°C. The heating program was 10°C / min and calcined for 4 hours to obtain a 10wt.% copper catalyst supported on calcined dolomite, which was recorded as 10wt% CuO-CD900. The catalytic activity ...

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Abstract

The invention relates to a metal-loaded dolomite catalyst. A preparation method for the catalyst comprises the following steps: grinding natural dolomite, putting the ground natural dolomite into a muffle furnace, conducting heating to 500-900 DEG C, and performing calcining for 4 hours to obtain calcined dolomite; dissolving a metal compound in deionized water at normal temperature to obtain a metal compound solution; and adding the calcined dolomite into the metal compound solution, conducting magnetic stirring for 3-5 hours, performing dipping for 20-30 hours, carrying out drying, putting adried product into a muffle furnace, carrying out heating to 500-900 DEG C, and performing calcining for 4 hours to obtain the metal-loaded dolomite catalyst. The metal-loaded dolomite catalyst is prepared by adopting an impregnation method, so an operation process is simple; the catalyst is low in price and friendly to environment; required process equipment is simple; a large amount of time andcost can be saved; the method is very suitable for large-scale production; and the catalyst can be used for preparing ethanol through glycerol dehydration, the selectivity of ethanol can reach 50% orabove, and good technical achievements are achieved.

Description

technical field [0001] The invention relates to a metal-loaded dolomite catalyst used for dehydration of glycerin to prepare ethanol, a preparation method thereof, and an application in dehydration of glycerin to prepare ethanol. Background technique [0002] With the continuous increase of global energy demand and the continuous consumption of global fossil resources, the requirements for green and sustainable chemical industry have increased significantly. Biodiesel is a renewable, environmentally friendly fuel. However, every ton of biodiesel produced produces 0.1 ton of glycerol as a by-product. With the rapid growth of biodiesel production, glycerol as a by-product also increases rapidly. Nowadays, a lot of research is focused on the conversion of glycerol to higher value-added chemicals, such as reforming to hydrogen, oxidation to glycolic acid, hydrogenation to 1,3-propanediol, and catalytic dehydration of glycerol to acrolein and ethanol. widespread attention of th...

Claims

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Application Information

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IPC IPC(8): B01J23/78B01J37/08C07C29/00C07C31/08
CPCC07C29/00B01J23/78B01J37/0036B01J37/088C07C31/08Y02E50/10
Inventor 周春晖蔡闻凯
Owner ZHEJIANG UNIV OF TECH
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