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Calcium-based magnetic solid base catalyst doped with rare earth elements and preparation method thereof

A solid base catalyst, rare earth element technology, applied in catalyst activation/preparation, chemical instruments and methods, heterogeneous catalyst chemical elements, etc., can solve the problems of poor catalyst reusability, unstable calcium oxide, difficult separation, etc. Achieve the effect of reducing operating costs, easy separation characteristics, and high activity

Inactive Publication Date: 2018-10-09
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, calcium oxide in water and CO 2 It is unstable in the presence of glycerol and it is difficult to separate from the product after reacting with it, and the poor reusability of the catalyst restricts its catalytic production of glycerol carbonate.

Method used

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  • Calcium-based magnetic solid base catalyst doped with rare earth elements and preparation method thereof

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Effect test

Embodiment 1

[0027] A calcium-based magnetic solid base catalyst doped with rare earth elements, the preparation method of the solid base catalyst comprises the steps of:

[0028] (1) Preparation of NiFe 2 o 4 Magnetic core;

[0029] ①Mix 10g of nickel nitrate hexahydrate, 24g of ferric nitrate nonahydrate and 80ml of water to form an aqueous solution;

[0030] ②Add citric acid aqueous solution (15g citric acid dissolved in 20ml water) dropwise to the aqueous solution obtained in step ①, and add dropwise while stirring. After the dropwise addition is completed, continue stirring for 1h, and then heat to 110°C to form a gel product;

[0031] ③Dry the gel product obtained in step ② in an oven at 130°C for 10 hours, then place it in a muffle furnace, and roast it at a roasting rate of 3°C / min. The roasting temperature is 800°C, and the roasting time is 3 hours. Lower the temperature in the muffle furnace, lower the temperature to 150°C and take out the resulting brown-red powder to obtain ...

Embodiment 2

[0039] A calcium-based magnetic solid base catalyst doped with rare earth elements, the preparation method of the solid base catalyst comprises the steps of:

[0040] (1) Preparation of NiFe 2 o 4 Magnetic core;

[0041] ①Mix 7.0g nickel nitrate hexahydrate, 9.7g iron nitrate nonahydrate and 80ml water to form an aqueous solution;

[0042] ②Add citric acid aqueous solution (4.2g citric acid dissolved in 20ml water) dropwise to the aqueous solution obtained in step ①, and add dropwise while stirring. After the dropwise addition is completed, continue stirring for 0.5h, and then heat to 90°C to form a gel product;

[0043] ③Dry the gel product obtained in step ② in an oven at 130°C for 8 hours, then place it in a muffle furnace, and roast it at a roasting rate of 2°C / min. The roasting temperature is 700°C, and the roasting time is 2 hours. Lower the temperature in the muffle furnace, lower the temperature to 50°C and take out the resulting brown-red powder to obtain the NiFe ...

Embodiment 3

[0051] A calcium-based magnetic solid base catalyst doped with rare earth elements, the preparation method of the solid base catalyst comprises the steps of:

[0052] (1) Preparation of NiFe 2 o 4 Magnetic core;

[0053] ① Mix 5.8g nickel nitrate hexahydrate, 48.5g iron nitrate nonahydrate and 80ml water to form an aqueous solution;

[0054] ②Add citric acid aqueous solution (21g citric acid dissolved in 20ml water) dropwise to the aqueous solution obtained in step ①, and add dropwise while stirring. After the dropwise addition is completed, continue stirring for 3h, and then heat to 120°C to form a gel product;

[0055] ③Dry the gel product obtained in step ② in an oven at 130°C for 12 hours, then place it in a muffle furnace, and roast it at a roasting rate of 5°C / min. The roasting temperature is 900°C, and the roasting time is 5 hours. Lower the temperature in the muffle furnace, lower the temperature to 200°C and take out the resulting brown-red powder to obtain the NiF...

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Abstract

The invention discloses a calcium-based magnetic solid base catalyst doped with rare earth elements. A preparation method of the solid base catalyst comprises the following steps: (1) preparing a NiFe2O4 magnetic core; (2) preparing an active precursor; (3) preparing the solid base catalyst. The catalyst prepared by the invention has the characteristics of high activity, good repeatability, easy separation and the like, meets the requirements of green chemistry, and has an attractive industrialization prospect.

Description

technical field [0001] The invention relates to the technical field of solid base catalysts, in particular to a calcium-based magnetic solid base catalyst doped with rare earth elements for synthesizing glycerol carbonate and a preparation method thereof. Background technique [0002] To minimize CO from burning fossil fuels 2 , the search for environmentally friendly alternative energy sources has become a topic of global discussion. Biodiesel has similar physicochemical and fuel properties to fossil fuels and has become a hot spot in the development of new energy sources around the world. Glycerol is the main by-product of the biodiesel industry. The rapid development of the biodiesel industry has oversaturated the glycerin market and seriously threatened its industrial competitiveness. Therefore, the research and application of converting glycerol into high value-added chemicals has attracted widespread attention from all over the world. [0003] As a value-added chemi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01J37/03B01J37/08C07C69/96C07C68/06
CPCC07C68/06B01J23/002B01J23/83B01J37/035B01J37/036B01J37/082B01J2523/00B01J35/33B01J2523/23B01J2523/3706B01J2523/842B01J2523/847B01J2523/3712B01J2523/3725C07C69/96
Inventor 张萍波朱梦楠顾丹范明明蒋平平
Owner JIANGNAN UNIV