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Method for catalytically synthesizing biodiesel by using solid base KF/MgO-CeO2 in spherical structure

A spherical structure, solid base technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of high reaction temperature, insufficient catalyst stability, unsatisfactory effect, etc., to achieve preparation The effect of simple process

Inactive Publication Date: 2019-05-03
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The catalyst stability of this method is not good enough, where Sm 2 o 3 / ZrO 2 The temperature for transesterification reaction is relatively high, and the yield is only 94% at 190-200 ° C for 5 hours
In order to explore better catalysts, we successively used CeO 2 , MgO and Ce, Mg mixed oxides are used as catalysts for transesterification to prepare biodiesel, but the results are not ideal

Method used

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  • Method for catalytically synthesizing biodiesel by using solid base KF/MgO-CeO2 in spherical structure
  • Method for catalytically synthesizing biodiesel by using solid base KF/MgO-CeO2 in spherical structure
  • Method for catalytically synthesizing biodiesel by using solid base KF/MgO-CeO2 in spherical structure

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Embodiment 1

[0024] 1. Spherical structure solid base KF / MgO-CeO 2 preparation of

[0025] Mg(NO 3 ) 2 ·6H 2 O, Ce(NO 3 ) 3 ·6H 2 O is added into deionized water according to a 1:1 molar ratio to form solution A with a metal ion molar solubility of 0.2 mol / L; configure 1 mol / L of sodium hydroxide solution B, and slowly add solution B to solution A until Mix solution pH=10, heat and stir at 40°C for 5 hours to obtain a sol-gel mixture, stand still for 1 hour, wash with a mixture of alcohol and water with a mass ratio of 0.5 to 1:1 and suction filter until the pH of the washing solution is 7, and the obtained filter cake is released Dry in an oven at 100°C overnight, then grind to a fine powder, put it into a muffle furnace and calcinate at 550°C for 4 hours at a heating rate of 2°C / min to obtain spherical structure MgO-CeO 2 Carrier, carrier particle diameter 15~28nm, specific surface area 59~94m 2 / g.

[0026] Then KF, the prepared spherical structure MgO-CeO 2Carrier and impregn...

Embodiment 2

[0029] Embodiment 2 operating steps are the same as embodiment 1, but the solid base catalyst is 0.1KF / CeO 2 , namely KF and CeO 2 The mass ratio of carrier is 0.1, and the mass yield of biodiesel product is 25.4%.

Embodiment 3

[0030] Embodiment 3 operating steps are the same as embodiment 1, but the solid base catalyst is 0.1KF / MgO-CeO 2 , where KF and MgO-CeO 2 The mass ratio of the carrier is 0.1, the molar ratio of Mg and Ce is 1:3, and the mass yield of biodiesel product is 85.1%.

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Abstract

A method for catalytically synthesizing biodiesel by using solid base KF / MgO-CeO2 in a spherical structure is as follow: MgO-CeO2 is used as a carrier to support basic substance KF on the MgO-CeO2 carrier by impregnation and calcination to obtain a spherical structure solid alkali KF / MgO-CeO2 catalyst with uniform alkali active site dispersion and good stability. The spherical solid alkali has theaperture diameter of 15 to 27 nm, a specific surface area of 52 to 76 m<2> / g, and a basicity pKa of 9.3 to 15.0. The spherical solid alkali is suitable for catalyzing transesterification of long-chain oils and alcohols to synthesize the biodiesel. The mass ratio of the catalyst to the oils is 0.05:1, the molar ratio of the alcohols to the oils is 25:1, the reaction temperature is 65 DEG C, the reaction time is 6 h, and the yield of the biodiesel is 98.6%.

Description

technical field [0001] The invention belongs to the field of biomass energy, and relates to a spherical structure solid base KF / MgO-CeO 2 Method for catalytic synthesis of biodiesel. Background technique [0002] Biodiesel is a renewable energy source. Fatty acid monoalkyl esters are obtained through transesterification of animal and plant waste oils and alcohols (methanol or ethanol), and fatty acid methyl esters are the most representative. Transesterification can be catalyzed by base or acid, and base catalysis is faster than acid catalysis. Homogeneous alkali KOH, NaOH solution catalysis has some defects, such as difficult separation, recycling and reuse, corrosion of equipment, and post-processing produces a large amount of wastewater polluting the environment. Patent CN 101591574A (application number 200910100264.3) uses impregnation method in ZrO 2 Upper load La 2 o 3 、Eu 3 o 3 ,,Y 2 o 3 、Sm 2 o 3 and other rare earth oxides, and catalyzed the transesterifi...

Claims

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Application Information

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IPC IPC(8): B01J27/12C11C3/10
Inventor 刘跃进唐红娟李勇飞王亚茹
Owner XIANGTAN UNIV
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