Mesoporous metal oxide catalyst for photo-catalytic CO2 reduction and preparation method

A mesoporous silica and photocatalytic technology, applied in the direction of hydrocarbon production from carbon oxides, physical/chemical process catalysts, carbon monoxide, etc., to achieve the effect of good process repeatability, simple operation, and high catalytic reduction of CO2

Inactive Publication Date: 2015-04-29
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, so far there has been no research on the rare earth semiconductor oxide CeO 2 and its modified

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A photocatalytic reduction of CO 2 The preparation method of the mesoporous metal oxide catalyst specifically comprises the following steps:

[0029] (1) Dissolve 0.08g of transition metal nitrate and 8.60g of cerium nitrate nonahydrate in 10ml of acetone to obtain a solution of metal nitrate in acetone, then add 2g of mesoporous silica material and stir for 2 hours, then transfer the resulting mixture into In a petri dish, air-dry naturally at room temperature to obtain the first powder;

[0030] The transition metal nitrate is ferric nitrate nonahydrate;

[0031] The mesoporous silica material is SBA-15 with hexagonal structure;

[0032] The amount of transition metal nitrate, cerium nitrate, mesoporous silica material and acetone used above is calculated according to the ratio of cerium nitrate: transition metal nitrate: mesoporous silica material: acetone is 19.8mmol:0.2mmol:2g:10ml ;

[0033] (2) Put the first powder obtained in step (1) in a muffle furnace, he...

Embodiment 2

[0042] A photocatalytic reduction of CO 2 The preparation method of the mesoporous metal oxide catalyst specifically comprises the following steps:

[0043] (1) Dissolve 0.40g of transition metal nitrate and 8.25g of cerium nitrate nonahydrate in 12ml of acetone to obtain a solution of metal nitrate in acetone, then add 2.4g of mesoporous silica material and stir and mix for 4 hours, then air dry naturally to obtain the first a powder;

[0044] The transition metal nitrate is chromium nitrate nonahydrate;

[0045] The mesoporous silica material is cubic structure MCM-48;

[0046] The amount of the above-mentioned transition metal nitrate used, cerium nitrate, mesoporous silicon oxide material and acetone is calculated according to the ratio of cerium nitrate: transition metal nitrate: mesoporous silicon oxide material: acetone is 19mmol:1mmol:2.4g:12ml;

[0047] (2) Place the first powder obtained in step (1) in a muffle furnace, and heat up to 550°C at a heating rate of 5°...

Embodiment 3

[0056] A photocatalytic reduction of CO 2 The preparation method of the mesoporous metal oxide catalyst specifically comprises the following steps:

[0057] (1) Dissolve 0.80g of transition metal nitrate and 7.81g of cerium nitrate in 20ml of acetone to obtain a solution of metal nitrate in acetone, then add 3g of mesoporous silica material and mix for 6 hours, then air dry naturally to obtain the first powder;

[0058] The transition metal nitrate is chromium nitrate nonahydrate;

[0059] The mesoporous silica material is a mixture of hexagonal structure SBA-15 and cubic structure MCM-48 in a mass ratio of 1:1;

[0060] The amount of the above-mentioned transition metal nitrate used, cerium nitrate, mesoporous silicon oxide material and acetone is calculated according to the ratio of cerium nitrate: transition metal nitrate: mesoporous silicon oxide material: acetone is 18.2mmol:2mmol:3g:20ml;

[0061] (2) Put the first powder obtained in step (1) in a muffle furnace, and h...

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Abstract

The invention discloses a mesoporous metal oxide catalyst for photo-catalytic CO2 reduction and a preparation method. The mesoporous metal oxide catalyst for the photo-catalytic CO2 reduction consists of an active component and a doping agent, wherein the active component is mesoporous CeO2, and the doping agent is transition metal ions. In the preparation process, transition metal nitrate and cerium nitrate are dissolved into acetone, mesoporous silica materials are added into an obtained metal nitrate acetone solution and are uniformly mixed, the mixture is naturally dried to obtain first powder, the first powder is calcined in a muffle furnace to obtain second powder, the second powder is etched by using a sodium hydroxide aqueous solution to remove the mesoporous silica materials, and the second powder is washed by using pure water and then is dried to obtain the mesoporous metal oxide catalyst for the photo-catalytic CO2 reduction, which has higher specific surface area, larger aperture and a regular pore structure. The mesoporous metal oxide catalyst is high in activity and selectivity in terms of photo-catalytic CO2 conversion, and the preparation method is relatively simple, and easy to expand.

Description

technical field [0001] The invention belongs to the technical field of photocatalyst and its preparation, in particular to a photocatalytic reduction of CO 2 Mesoporous metal oxide catalyst and preparation method thereof. Background technique [0002] With the rapid development of industry, the content of carbon dioxide in the atmosphere is gradually increasing, and the impact on the natural environment and the earth's ecology is becoming more and more serious. Therefore, reducing carbon dioxide emissions and selectively reducing the content of carbon dioxide in the atmosphere has become a global economic development, new energy and high-tech industries. It is one of the major practical and strategic issues in the development of science and technology environmental protection technology. CO as the main greenhouse gas 2 It is a rich carbon source, which has the advantages of being cheap, stable, and non-combustible, so CO 2 Low energy consumption and high efficiency conver...

Claims

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Application Information

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IPC IPC(8): B01J29/03C01B31/18C07C1/02C07C9/04C01B32/40
Inventor 王燕刚王菲柏霞李亚光崔立峰
Owner UNIV OF SHANGHAI FOR SCI & TECH
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