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TiO2-x-based hindered Lewis acid-base pair photocatalyst as well as preparation method and application thereof

A Lewis acid-base and photocatalyst technology, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve difficult problems such as Lewis acid-base regulation, which is beneficial to adsorption and activation, The effect of mild reaction conditions and wide CO2 content

Active Publication Date: 2021-03-30
QINGDAO UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

Hindered Lewis acid-base pair in the photocatalytic reduction of CO 2 Molecule adsorption and activation play an important role. Existing catalyst surface construction hindered Lewis acid-base pair technology has important practical challenges due to its delicate operation process. It is difficult to achieve atomic-level hindered Lewis on the surface of different materials. Acid-base pair regulation

Method used

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  • TiO2-x-based hindered Lewis acid-base pair photocatalyst as well as preparation method and application thereof
  • TiO2-x-based hindered Lewis acid-base pair photocatalyst as well as preparation method and application thereof
  • TiO2-x-based hindered Lewis acid-base pair photocatalyst as well as preparation method and application thereof

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preparation example Construction

[0035] Hindered Lewis acid-base pair TiO 2-x The preparation method of material photocatalyst and application thereof, comprises the following steps:

[0036] (1) 1mmol salt (MCl 2 、MCO 3 , M(NO 3 ) 2 , M=Mg, Ca, Sr, Ba, Mn, Fe, Co, Ni, Cu, Zn) were dissolved in 10-40mL of a mixed solution of ethanol and polyethylene glycol, the solution was stirred evenly, and then added to the above solution 1mmol of titanium source (n-butyl titanate, isopropyl titanate), stir evenly, add 6mmol of alkaline mineralization reagent (NaOH, KOH), stir evenly, transfer to a reaction kettle and put it in an oven at 150-200°C for 12 ~25h, the perovskite material MTiO was obtained after centrifugal washing 3 .

[0037] (2) Weigh 0.5mmol of the above-prepared MTiO 3 Add it to the mixed solution of 20-60mL water and polyethylene glycol, then add 1mmol chelating reagent (EDTA-2Na or its hydrate), after the solution is stirred evenly, put it into the reaction kettle and react in an oven at 150-200...

Embodiment 1

[0039] Example 1CaTiO 3 Catalyst preparation

[0040] (1) 1mmol CaCl 2 ·H 2 O was dissolved in 20mL of a mixed solution of ethanol and polyethylene glycol, and the solution was stirred evenly, then 1mmol of titanium source (n-butyl titanate, isopropyl titanate) was added to the above solution, and 6mmol of alkaline Mineralizing reagents (NaOH, KOH), stirred evenly, then transferred to the reaction kettle and placed in an oven at 180°C for 15 hours of reaction. The perovskite material MTiO was obtained after centrifugal washing 3 (Such as figure 1 shown).

[0041] (2) Weigh 0.5mmol of the above-prepared CaTiO 3 Add it to the mixed solution of 40mL water and polyethylene glycol, then add 1mmol chelating reagent (EDTA-2Na or its hydrate), after the solution is stirred evenly, put it into the reaction kettle and react in an oven at 180°C for 12h, then centrifuge and wash Obtaining TiO Containing Hindered Lewis Acid-Base Pairs 2 Photocatalyst (morphology such as figure 2 ...

Embodiment 2

[0043] Example 2MgCl 2 Catalyst preparation

[0044] (1) 1.2mmol MgCl 2 Dissolve in a mixed solution of 30mL ethanol and polyethylene glycol, stir the solution evenly, then add 1mmol titanium source (n-butyl titanate, isopropyl titanate) to the above solution, stir evenly, add 4mmolNaOH reagent, stir After uniformity, it was transferred to a reaction kettle and placed in an oven at 180°C for 15 hours of reaction. The perovskite material MgTiO was obtained after centrifugal washing 3 .

[0045] (2) Weigh 0.5mmol of the above-prepared MgTiO 3 Add it to the mixed solution of 30mL water and polyethylene glycol, then add 1mmol chelating reagent (EDTA-2Na or its hydrate), after the solution is stirred evenly, put it into the reaction kettle and react in an oven at 180°C for 12h, then centrifuge and wash Obtaining TiO Containing Hindered Lewis Acid-Base Pairs 2 catalyst of light.

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Abstract

The invention belongs to the field of material synthesis and catalytic reaction, and particularly relates to a TiO2x-based hindered Lewis acid-base pair photocatalyst as well as a preparation method and application thereof. Perovskite MTiO3 with a certain structure is synthesized firstly, and then MTiO3 is subjected to in-situ topological transformation and chelation to remove M2+; thus, the photocatalyst containing oxygen vacancies and hindered Lewis acid-base pairs with adjacent hydroxyl groups on the surface is obtained. The TiO2x-based photocatalyst has relatively high CO2 adsorption capacity, and can realize adsorption and activation of gas molecules, so that the CO2 reduction efficiency of the TiO2-based photocatalyst is improved. The preparation method of the catalyst is simple andeasy to implement and mild in reaction condition and has wide application prospects in the aspects of reducing the content of CO2 in the atmosphere and efficiently utilizing solar energy to achieve chemical energy conversion. The technical scheme is a developable novel method for constructing hindered Lewis acid-base pairs, and can be used for efficient photocatalytic CO2 reduction reaction.

Description

technical field [0001] The invention belongs to the field of material synthesis and catalytic reaction, in particular to a TiO-based 2-x Hindered Lewis acid-base pair photocatalyst and its preparation method and application. Background technique [0002] Energy shortage and environmental problems are severe problems facing human society today. Due to the excessive exploitation of fossil fuels such as coal, oil, and natural gas, CO 2 Excessive emissions have seriously affected the balance of the natural carbon cycle and brought serious environmental problems, especially the growing greenhouse effect. Therefore, it is of great research significance to develop clean energy to replace traditional non-renewable energy. Using photocatalytic technology to convert CO 2 Conversion into valuable hydrocarbon fuels such as CO, CH 4 , CH 3 OH, CH 3 COOH, provides a way to solve carbon emissions and alleviate the energy crisis. Photocatalytic technology has the advantages of low co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J35/00B01J37/00C01B32/40
CPCB01J21/063B01J37/0018C01B32/40B01J35/39Y02P20/133
Inventor 贾长超张霞王志远朱少奇林刚
Owner QINGDAO UNIV OF SCI & TECH
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