Three-way catalyst for preparing glyceric acid by oxidizing glycerol and preparing method thereof

A technology of glyceric acid and supported catalysts, which is applied in the direction of metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of poor selectivity and low catalytic activity, and achieve Easy operation, high catalytic conversion rate, and low energy consumption

Inactive Publication Date: 2019-04-16
INNER MONGOLIA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of ternary supported catalyst and preparation method thereof for oxidizing glycerol to prepare glyceric acid, described ternary supported cat

Method used

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  • Three-way catalyst for preparing glyceric acid by oxidizing glycerol and preparing method thereof
  • Three-way catalyst for preparing glyceric acid by oxidizing glycerol and preparing method thereof
  • Three-way catalyst for preparing glyceric acid by oxidizing glycerol and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: Pt / CeO 2 -OCNT

[0026] S01: Weigh multi-walled carbon nanotubes (MWCNTs, diameter 40-60nm), oxidize with concentrated nitric acid, control the mass ratio of multi-walled carbon nanotubes and nitric acid to 1:98, the temperature is 75°C, and the stirring time is 12h After the reaction, wash with distilled water for several times until the washing supernatant is neutral, and dry the sample at 80°C to obtain OCNT oxidized by nitric acid.

[0027] S02: Disperse 100mg of carbon nanotubes OCNT oxidized by nitric acid in 30mL of absolute ethanol, ultrasonicate for 5 minutes to form a uniform solution, and continue stirring for 10 minutes; then add 0.478g of cerium ammonium nitrate (according to CeO 2 The mass ratio of OCNT to OCNT is 1.5:1 (calculated) powder, and the powder is completely dispersed into the solution by ultrasound, and the stirring is continued for 10 minutes; a sodium hydroxide aqueous solution with a concentration of 0.09g / mL is added dropwise, a...

Embodiment 2

[0030] Example 2: Pt / CeO2 -OCNT

[0031] S01: Weigh MWCNTs, and the processing method is the same as that in Example 1.

[0032] S02: Preparation of CeO 2 When / OCNT carrier, method is the same as embodiment 1, and the results are shown in summary table 1.

[0033] S03: Weigh 0.1425g of CeO 2 / OCNT (1.5:1) carrier was dispersed in absolute ethanol, dispersed to form a uniform solution, kept stirring for 30min, added 3.79mL K 2 PtCl 4 aqueous solution, and the subsequent loading process is the same as in Example 1.

[0034] S04: The reaction conditions for glycerol oxidation are the same as in Example 1, and the results are shown in summary table 1.

Embodiment 3

[0035] Example 3: Pt / CeO 2 -OCNT

[0036] S01: Weigh MWCNTs, and the processing method is the same as that in Example 1.

[0037] S02: Preparation of CeO 2 When / OCNT carrier, method is the same as embodiment 1, and the results are shown in summary table 1.

[0038] S03: Weigh 0.1425g of CeO 2 / OCNT (1.5:1) carrier was dispersed in absolute ethanol, dispersed to form a uniform solution, kept stirring for 30min, and added 3.59mL Pt(acac) 2 aqueous solution, and the subsequent loading process is the same as in Example 1.

[0039] S04: The reaction conditions for glycerol oxidation are the same as in Example 1, and the results are shown in summary table 1.

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Abstract

The invention relates to a three-way catalyst for preparing glyceric acid by oxidizing glycerol and a preparing method thereof. In the three-way catalyst, precious metal serves as an active component,rare earth oxide and carbon nanotubes serve as a carrier, and the mass ratio of the precious metal, the rare earth oxide and the carbon nanotubes is (0.02-0.05):(1.0-3.0):1.0; the carbon nanotubes are selected from at least one kind of unprocessed carbon nanotubes, carbon nanotubes oxidized with concentrated nitric acid, carbon nanotubes oxidized with concentrated sulfuric acid, carbon nanotubesprocessed with KON and carbon nanotubes processed with PEG. Compared with a metal/carbon-carrier binary catalyst, the three-way catalyst has higher catalytic activity and higher glyceric acid selectivity in the process of a glycerol selective oxidation reaction conducted under the neutral condition. The preparing method is easy and convenient to operate, instrument equipment is simple, and energyconsumption is low.

Description

technical field [0001] The invention belongs to the field of selective oxidation catalysts, in particular to a three-way catalyst for oxidizing glycerin to prepare glyceric acid and a preparation method thereof. Background technique [0002] Glycerol is a by-product in the process of biodiesel production, and with the development of biodiesel, the production of glycerol is huge. There are three hydroxyl functional groups in the glycerol molecule. Using glycerol as a raw material, various types of chemicals with high added value can be obtained after catalytic oxidation. The catalytic oxidation of glycerol is a very complicated process of multiple parallel reactions and a series of reactions. If the oxidation The primary hydroxyl group of the glycerol molecule can be used to obtain glyceric acid, glyceraldehyde, tartaric acid and other products. Glyceric acid is obtained by further oxidation of glyceraldehyde, an intermediate product obtained after the dehydrogenation reacti...

Claims

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Application Information

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IPC IPC(8): B01J23/63C07C59/10C07C51/23
CPCC07C51/23B01J23/63C07C59/10
Inventor 褚海斌张雪琼王晓静周健
Owner INNER MONGOLIA UNIVERSITY
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