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Preparation and application methods of efficient photocatalytic CO2 hydrogenation material photocatalyst

A photocatalyst and photocatalytic technology, applied in the field of photocatalysis, can solve problems such as loss and photocatalytic efficiency reduction, and achieve the effect of easy control, simple method and mild conditions

Inactive Publication Date: 2017-12-01
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In general, the chemical reaction time is 10 -8 -10 -3 s, while the photogenerated electron-hole recombination time is 10 -9 s, so most of the electrons and holes generated by photoexcitation undergo recombination reactions, and finally dissipate in the form of heat energy, which leads to a decrease in photocatalytic efficiency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0020] (1) Preparation of Pd supported photocatalyst:

[0021] Take TiO 2 The material is dispersed in deionized water, ultrasonically stirred, and TiO is added by pressing 2 Add 0.5%-1.5% of the mass to sodium chloropalladate solution, adjust the pH to 7-10 with NaOH solution, add glucose, water bath for 0.5-2h at a temperature of 60-90°C, centrifuge, wash, and vacuum dry to obtain Pd / TiO 2 catalyst of light;

[0022] (2) Photocatalytic CO 2 Hydrogenation reaction:

[0023] Tin foil paper is added to the inner wall of the high-pressure visible micro-kettle reactor, which plays a role in concentrating light. The quartz wool evenly disperses and supports the catalyst, and a certain space is left at the bottom for stirring to strengthen the gas flow. The photocatalyst is dispersed on the quartz wool. 2 Remove the internal air for half an hour, add 2-3MPa H 2 with 0.5-1MPa CO 2 , 100-150W mercury lamp is used as light source, photocatalytic hydrogenation reaction is carri...

Embodiment 1

[0025] Example 1: Efficient Photocatalytic CO 2 Hydrogenation material Pd / TiO 2 The preparation and application method of , the operation steps are as follows:

[0026] (1) Preparation of Pd supported photocatalyst:

[0027] Take 0.5g of TiO 2 The material was dispersed in 60 mL of deionized water, ultrasonically stirred for 10 min, and TiO was added according to 2 Add sodium chloropalladate solution to 0.5% of the mass, adjust the pH to 9 with 0.1 mol / L NaOH solution, add 5 times the amount of glucose to reduce the amount, take a water bath for 0.5 h at 60 °C, centrifuge, wash, and vacuum dry to obtain Pd / TiO 2 catalyst of light;

[0028] (2) Photocatalytic CO 2 Hydrogenation reaction:

[0029] Tin foil paper was added to the inner wall of the high-pressure visible micro-kettle reactor to concentrate light. 0.5g of quartz wool was evenly dispersed to carry the catalyst, and a certain space was left at the bottom for stirring to enhance gas flow. 0.05g of photocatalyst ...

Embodiment 2

[0030] Example 2: Efficient Photocatalytic CO 2 Hydrogenation material Pd / TiO 2 The preparation and application method of , the operation steps are as follows:

[0031] (1) Preparation of Pd supported photocatalyst:

[0032] Take 0.5g of TiO 2 The material was dispersed in 60 mL of deionized water, ultrasonically stirred for 10 min, and TiO was added according to 2 1.0% of the mass was added with sodium chloropalladate solution, adjusted the pH to 8 with 0.1mol / L NaOH solution, added 5 times of glucose to reduce the metered amount, water bath at 80°C for 1h, centrifuged, washed, and vacuum dried to obtain Pd / TiO 2 catalyst of light;

[0033] (2) Photocatalytic CO 2 Hydrogenation reaction:

[0034] Tin foil paper was added to the inner wall of the high-pressure visible micro-kettle reactor, which played a role in concentrating light. 0.5g of quartz wool was evenly dispersed to carry the catalyst, and a certain space was left at the bottom for stirring to strengthen the ...

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PUM

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Abstract

The invention relates to preparation and application methods of an efficient photocatalytic CO2 hydrogenating material photocatalyst. The preparation method mainly comprises two parts including preparation of a Pd / TiO2 photocatalyst and photocatalytic CO2 hydrogenation; Pd is loaded on TiO2 through a glucose reduction method, and the photocatalyst containing 0.5 percent to 1.5 percent of Pd-loaded TiO2 is prepared. Photocatalytic CO2 hydrogenation reaction is carried out in a mini-type high-pressure visible kettle type reactor; 2MPa of H2 and 0.5MPa of CO2 are introduced and the Pd / TiO2 photocatalyst is added; a 150W mercury lamp is used as a light source and the photocatalytic hydrogenation reaction is carried out for 1h to 5h by stirring at room temperature to obtain a main product CH4 and little C2H6 and CO are generated. The preparation and application methods of the efficient photocatalytic CO2 hydrogenating material photocatalyst, provided by the invention, have the main advantages that the methods are simple, reaction conditions are moderate and the cost is low; the efficient photocatalytic CO2 hydrogenating material photocatalyst can be circularly utilized and a process has no pollution; greenhouse gas CO2 can be converted into a carbon-hydrogen energy source with high additional value, so that the preparation and application methods have important meaning for solving environment problems and energy source problems.

Description

technical field [0001] The invention relates to a high-efficiency photocatalytic CO 2 Hydrogenation material Pd / TiO 2 Preparation and application methods of , especially Pd / TiO 2 Preparation method of photocatalytic material and its photocatalytic CO under ultraviolet light 2 Hydrogenation to CH 4 The effective application of the invention belongs to the technical field of photocatalysis. Background technique [0002] With the continuous use of fossil fuels, environmental pollution and energy shortages have become major crises that people are facing. 2 It is the main gas causing the greenhouse effect, leading to global warming, seriously affecting ecological and environmental problems, CO 2 As one of the most abundant carbon sources, developing CO 2 Not only can reduce environmental pollution, but also reduce CO 2 Converting into useful energy can solve the energy problem, so it has attracted people's attention and attention. [0003] Photocatalytic technology can ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44B01J21/06C07C1/12C07C9/04
CPCC07C1/12B01J21/063B01J23/44C07C2523/44C07C2521/06B01J35/39C07C9/04
Inventor 周建成刘明李乃旭杨斌舒位欣郑雨
Owner SOUTHEAST UNIV
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