Photocatalyst for CO2 reduction-biomass oxidation coupling reaction and preparation method thereof

A photocatalyst, oxidative coupling technology, applied in catalyst activation/preparation, physical/chemical process catalyst, carbon monoxide, etc., can solve the problems of limited coupling reaction efficiency, photoresponse and poor photogenerated electron-hole separation ability, and achieve excellent performance, the effect of realizing separation ability

Pending Publication Date: 2022-07-22
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as a single LDH as a photocatalyst, its photoresponse and photogenerated electron-hole separation ability are relatively poor, which limits the further improvement of the coupling reaction efficiency.

Method used

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  • Photocatalyst for CO2 reduction-biomass oxidation coupling reaction and preparation method thereof
  • Photocatalyst for CO2 reduction-biomass oxidation coupling reaction and preparation method thereof
  • Photocatalyst for CO2 reduction-biomass oxidation coupling reaction and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A: Weigh 0.004mol of Mg(NO 3 ) 2 ·6H 2 O and 0.002 mol of Al (NO 3 ) 3 ·9H 2 O powder, dissolved in a beaker with 30 mL of deionized water.

[0037] B: Weigh 0.03mol of urea and 0.6000g of TiO 2 powder, into a beaker containing 30 mL of deionized water.

[0038] C: Add the above two solutions to another beaker at the same time, through vigorous stirring and ultrasonic dispersion, until the TiO 2 The powder is uniformly dispersed in the solution to obtain MgAl-LDH / TiO 2 The suspension was transferred to the reactor, aged at 120°C for 24h, centrifuged and washed to neutralize the filtrate; dried at 50°C for 12h, taken out and ground into powder to obtain MgAl-LDH / TiO 2 Photocatalysts, of which TiO 2 The mass ratio to MgAl-LDH is 1.

[0039] The above-prepared photocatalysts were used to drive CO by light 2 Reduction-5-HMF oxidation coupling reaction experiment:

[0040] Dissolve 30 mg of catalyst powder in 60 mL of 0.02 g / L 5-HMF solution, put it into a top-il...

Embodiment 2

[0042] A: Weigh 0.006mol of Ni(NO 3 ) 2 ·6H 2 O and 0.002mol Fe(NO 3 ) 3 ·9H 2 O powder, dissolved in a beaker containing 30 mL of deionized water.

[0043] B: Weigh 0.02mol of urea and 0.3000g of Cu 2 O solid, feeding into a beaker filled with 30 mL of deionized water.

[0044] C: Add solution A and suspension B to the beaker at the same time, and stir vigorously and ultrasonically disperse until Cu 2 O powder is uniformly dispersed in the solution to obtain NiFe-LDH / Cu 2 O suspension; transferred to the reactor, aged at 100°C for 12h, washed and centrifuged until neutral; dried at 60°C for 12h, taken out, and ground into powder to obtain NiFe-LDH / Cu 2 O photocatalyst, where Cu 2 The mass ratio of O to NiFe-LDH is 0.6.

Embodiment 3

[0046] A: Weigh 0.004mol of Zn(NO 3 ) 2 ·6H 2 O and 0.002 mol of Cr (NO 3 ) 3 ·9H 2 O powder, dissolved in a beaker containing 30 mL of deionized water.

[0047] B: Weigh 0.04mol of urea and 1.2000g of CeO 2 The solid was charged into a beaker containing 30 mL of deionized water.

[0048] C: Add solution A and suspension B to the beaker simultaneously, and stir vigorously and ultrasonically disperse until CeO 2 The powder is uniformly dispersed in the solution to obtain ZnCr-LDH / CeO 2 the suspension; transferred to the reactor, aged at 150 °C for 36 h, washed and centrifuged until neutral; dried at 60 °C for 12 h, taken out, and ground into powder to obtain ZnCr-LDH / CeO 2 Photocatalysts in which CeO 2 The mass ratio to ZnCr-LDH is 3.

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Abstract

The invention provides a photocatalyst for CO2 reduction-biomass oxidation coupling reaction and a preparation method thereof.The photocatalyst is synthesized through a one-step hydrothermal method, and the composite photocatalyst LDH / N, N-dimethyl formamide is obtained by controlling the aging temperature, the reaction time and the proportion and variety of LDH and metal oxide; wherein N is an oxide with excellent light response capability and photo-induced electron capture capability, and interlayer anions of LDH are CO3 < 2->. The photocatalyst can generate more electrons (e <->) and holes (h < + >) in photocatalytic CO2 reduction-biomass oxidation coupling reaction, the electrons (e <->) and the holes (h < + >) participate in CO2 reduction half-reaction and biomass oxidation half-reaction respectively, and meanwhile, CO3 < 2-> pre-enriched between LDH laminates promotes the reduction half-reaction, so that the catalyst shows excellent catalytic performance.

Description

technical field [0001] The present invention belongs to CO 2 The field of comprehensive utilization and photocatalyst preparation, in particular to a preparation method and application of a composite LDH / N photocatalyst, which can be used for photocatalysis of CO 2 Reduction and biomass oxidation coupled reaction process. Background technique [0002] Over the past half century, rapid population growth, substantial progress in industrial technology, and over-exploitation and burning of fossil fuels have led to CO2 emissions. 2 The main greenhouse gas emissions have increased significantly, and the resulting energy crisis has intensified, seriously threatening the survival and sustainable development of human beings. In this context, photocatalytic CO 2 The reduction technology has received extensive attention and research, and CO can be realized under light driving. 2 Conversion to a series of high value-added products such as CO, hydrocarbons, liquid fuels, etc. And co...

Claims

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Application Information

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IPC IPC(8): B01J27/236B01J37/10C01B32/40C07D307/46
CPCB01J27/236B01J37/10C07D307/46C01B32/40B01J35/39
Inventor 李殿卿冯俊婷赵银范嘉烜王倩
Owner BEIJING UNIV OF CHEM TECH
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