Modified dolomite solid base catalyst for biodiesel as well as preparation method and application thereof

A solid base catalyst, biodiesel technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problems of waste of resources, high cost, and achieve mechanical properties. good effect of improving pore structure and excellent catalytic performance

Active Publication Date: 2019-12-24
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solid base catalyst in the present invention uses low-cost dolomite as a raw material, effectively solving the problem of high cost and waste of resources; through the calcination-hydration-re-calcination process,

Method used

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  • Modified dolomite solid base catalyst for biodiesel as well as preparation method and application thereof

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preparation example Construction

[0022] In view of this, in a specific embodiment of the present invention, a kind of preparation method of the modified dolomite solid base catalyst of biodiesel is provided, comprising:

[0023] 1) heating and calcining the dolomite after drying;

[0024] 2) immersing the calcined dolomite powder (i.e. the calcined product) in the manganese nitrate solution in step 1), stirring and drying for later use;

[0025] 3) The white solid in step 2) is pulverized, heated and calcined again, and obtained after cooling.

[0026] In yet another specific embodiment of the present invention, in step 1), the drying temperature is 105-110° C., and the drying time is 20-30 h (preferably 24 h).

[0027] In yet another specific embodiment of the present invention, in the step 1), the calcination temperature is controlled at 750-850°C (preferably 800°C), and the calcination time is 4-6h (preferably 5h).

[0028] In yet another specific embodiment of the present invention, in the step 1), the ...

Embodiment 1

[0041] Take 100g of dolomite powder and place it in a blast drying oven, and dry it at 105°C for 24 hours for later use; take the dried dolomite powder and calcinate it in a muffle furnace at 800°C for 5 hours, and obtain the calcined product after cooling for later use; weigh 0.292g of mass concentration as 50% manganese nitrate (Mn(NO 3 ) 2 4H 2 (2) solution mixes with 99.708g deionized water, stirs and configures manganese nitrate dilute solution; Take by weighing 10g calcined back dolomite mixes with above-mentioned manganese nitrate solution, after stirring (350rpm) immersion 4h, evaporate to dryness under 65 ℃ of water bath conditions, Dry at 105°C for later use; grind the impregnated product through a 200-mesh sieve, and then calcinate in a muffle furnace at 900°C for 5 hours to obtain a modified solid base catalyst with a molar ratio of Mn / Ca of 0.5:100, which is designated as sample 1.

[0042] 0.6g of catalyst, 6.263g of methanol, and 20g of palm oil were successiv...

Embodiment 2

[0044] Take 100g of dolomite powder and place it in a blast drying oven, and dry it at 105°C for 24 hours for later use; take the dried dolomite powder and calcinate it in a muffle furnace at 800°C for 5 hours, and obtain the calcined product after cooling for later use; weigh 0.583g of mass concentration as 50% manganese nitrate (Mn(NO 3 ) 2 4H 2 (2) solution mixes with 99.417g deionized water, stirs and configures manganese nitrate dilute solution; Take by weighing 10g calcined back dolomite and above-mentioned manganese nitrate solution mix, stir (350rpm) after impregnating 4h, evaporate to dryness under 65 ℃ of water-bath conditions, solvent, Dry at 105°C for later use; grind the impregnated product through a 200-mesh sieve, and then calcinate in a muffle furnace at 800°C for 5 hours to obtain a modified solid base catalyst with a Mn / Ca molar ratio of 1:100, designated as sample 2.

[0045] 0.6g of catalyst, 6.263g of methanol, and 20g of palm oil were successively added...

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Abstract

The invention provides a modified dolomite solid base catalyst for biodiesel as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) drying dolomite, then heating and calcining the dolomite; 2) soaking the dolomite powder calcined in the step 1) into a manganous nitrate solution, stirring the mixture and drying for later use; and 3) crushing the white solid obtained in the step 2), heating and calcining the solid again, and cooling to obtain the product. According to the catalyst, dolomite is modified by adding a small amount of manganese element so that low-coordination oxygen ions and metal oxygen electron pairs existing on the surface of the catalyst are easier to obtain and lose electrons; hydroxyl in reactant methanol is subjected to proton transfer to generate more methoxy anions, so that the catalyst has strong basicity for catalyzing smooth ester exchange reaction, the ester exchange efficiency is greatly improved, andtherefore, the catalyst has good industrial application prospect and practical application value.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a modified dolomite solid base catalyst for biodiesel, a preparation method and application thereof. Background technique [0002] The information disclosed in the Background of the Invention is only intended to increase the understanding of the general background of the invention, and is not necessarily to be taken as an acknowledgment or any form of suggestion that the information constitutes the prior art that is already known to those skilled in the art. [0003] As a typical green renewable energy, biodiesel has similar or even better physical and chemical indicators such as flash point and cetane number compared with traditional petroleum diesel. It is also renewable, biodegradable, and has low sulfur content in combustion products. and other advantages. Vigorously developing the biodiesel industry can alleviate the energy crisis and environmental ...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01J35/10C11C3/10
CPCB01J23/002B01J23/8892B01J35/10B01J2523/00C11C3/10B01J2523/22B01J2523/23B01J2523/41B01J2523/47B01J2523/72B01J2523/842B01J2523/845Y02E50/10
Inventor 牛胜利宁一麟韩奎华李英杰齐建荟路春美王永征赵建立程世庆
Owner SHANDONG UNIV
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