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Bifunctional catalyst for photocatalytic synthesis of dihydroxyacetone and hydrogen, preparation method and application thereof

The technology of a bifunctional catalyst and dihydroxyacetone is applied in the field of photocatalytic synthesis of bifunctional catalysts for dihydroxyacetone and hydrogen and the preparation thereof, and can solve the problems of easy polymerization of photogenerated electron-holes, poor photocatalytic performance, and the like, To achieve the effect of good selectivity, simple preparation method and mild reaction conditions

Active Publication Date: 2020-05-22
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But generally prepared g-C 3 N 4 It is a large sheet-like stacking structure, and its photogenerated electron-holes are easily aggregated, resulting in poor photocatalytic performance.

Method used

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  • Bifunctional catalyst for photocatalytic synthesis of dihydroxyacetone and hydrogen, preparation method and application thereof
  • Bifunctional catalyst for photocatalytic synthesis of dihydroxyacetone and hydrogen, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 2 g of ammonium acetate and 20 g of urea were added to the mortar. After grinding for 20 minutes, transfer the obtained white powder to a 50mL crucible, compact it, cover the crucible lid and wrap it tightly with tin foil. Put the crucible above into a muffle furnace for firing, the heating rate is 8°C per minute, the firing temperature is 550°C, and the firing time is 2 hours. After the calcination, it was naturally cooled to room temperature, and the yellow solid obtained in the crucible was taken out and ground to powder. The yellow powder obtained above was subjected to secondary roasting: the yellow powder was transferred to a 50 mL crucible, and put into a muffle furnace without the lid of the crucible. The heating rate was 5°C per minute, the firing temperature was 520°C, and the firing time was 2 hours. After the muffle furnace was cooled to room temperature, the yellow powder in the crucible was taken out to obtain a bifunctional catalyst.

Embodiment 2

[0023] Add 1 g of ammonium oxalate and 20 g of urea in a mortar. After grinding for 15 minutes, transfer the resulting white powder to a 50mL crucible, compact it, cover the crucible lid and wrap it tightly with tin foil. Put the crucible above into a muffle furnace for firing, the heating rate is 5°C per minute, the firing temperature is 500°C, and the firing time is 4 hours. After the calcination, it was naturally cooled to room temperature, and the yellow solid obtained in the crucible was taken out and ground to powder. The yellow powder obtained above was subjected to secondary roasting: the yellow powder was transferred to a 50 mL crucible, and put into a muffle furnace without the lid of the crucible. The heating rate was 2°C per minute, the firing temperature was 500°C, and the firing time was 4 hours. After the muffle furnace was cooled to room temperature, the yellow powder in the crucible was taken out to obtain a bifunctional catalyst.

Embodiment 3

[0025] The difference from Example 1 is that the carbon nitride precursor is replaced by cyanamide.

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Abstract

The invention discloses a bifunctional catalyst for photocatalytic synthesis of dihydroxyacetone and hydrogen, a preparation method and application thereof, wherein the catalyst is oxygen-doped graphite-like carbon nitride, the oxygen-doped source is at least one of ammonium acetate, ammonium formate and ammonium oxalate, the carbon nitride precursor is at least one of urea, cyanamide, dicyandiamide, melamine and thiourea, and a mass ratio of the oxygen-doped source to the carbon nitride precursor is (1-10):100. Compared with the prior art, the bifunctional catalyst of the invention has the following advantages: (1) the bifunctional catalyst has good selectivity; (2) the reaction conditions of the bifunctional catalyst are mild, and an environmentally-friendly route is provided for high-added-value utilization of glycerol; and (3) the preparation method of the bifunctional catalyst is simple and efficient.

Description

technical field [0001] The invention belongs to the technical field of energy reuse, and relates to a method for photocatalytically synthesizing dihydroxyacetone and hydrogen, in particular to a bifunctional catalyst for photocatalytically synthesizing dihydroxyacetone and hydrogen, a preparation method and application thereof. Background technique [0002] As a green energy with broad application prospects, biodiesel has been widely concerned and researched by people. Every 9 tons of biodiesel produced will produce 1 ton of by-product glycerol. With the development of biodiesel industry, the utilization of by-product glycerol has become an urgent problem to be solved. It is an important solution to turn cheap glycerin into high-value chemical products. [0003] Due to its high added value, dihydroxyacetone has become a research hotspot in the high-value utilization of glycerol. Dihydroxyacetone is the simplest polyhydroxy ketose. It is very soluble in water, ether, ethano...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C07C45/39C07C49/17C01B3/22
CPCB01J27/24C07C45/39C01B3/22C01B2203/1041B01J35/39C07C49/17Y02P20/584
Inventor 张萍波岳成光范明明蒋平平
Owner JIANGNAN UNIV
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