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TiO<2>@SiO<2> photocatalyst and application of same to photocatalytic reduction for CO<2>

A photocatalyst and catalyst technology, which is applied in the field of TiO2SiO2 photocatalyst and photocatalytic reduction of CO2, can solve the problem that the influence of reduction activity has not attracted certain attention, lack and other problems, and achieve outstanding effect, simple preparation method and low cost. Effect

Inactive Publication Date: 2016-02-03
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still a lack of reports on improving the photocatalytic performance of semiconductor photocatalysts by coating them with silica, especially for gas-phase photocatalytic CO 2 The investigation of the effect of reducing activity has not attracted some attention

Method used

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  • TiO&lt;2&gt;@SiO&lt;2&gt; photocatalyst and application of same to photocatalytic reduction for CO&lt;2&gt;
  • TiO&lt;2&gt;@SiO&lt;2&gt; photocatalyst and application of same to photocatalytic reduction for CO&lt;2&gt;
  • TiO&lt;2&gt;@SiO&lt;2&gt; photocatalyst and application of same to photocatalytic reduction for CO&lt;2&gt;

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 20mgTiO 2 The photocatalyst is placed in a quartz reaction tube with a volume of 25ml, the reaction tube is evacuated and filled with pure carbon dioxide gas, and the operation is repeated three times; after that, 0.5ml of evacuated liquid water is injected into the quartz tube with a syringe to keep CO 2 The final pressure is 8kPa; after illuminating the above system (simulating sunlight) for 8h, use a sampling needle to take out 0.3ml of reactive gas from the reaction tube and analyze it by gas chromatography; calculated, H 2 The rate of formation is 2.17μmolg -1 h -1 , The generation rate of CO is 1.79μmolg -1 h -1 , CH 4 The rate of formation is 0.77μmolg -1 h -1 , CO 2 The conversion rate is 2.62 μmolg -1 h -1 , The selectivity to CO is 25.23%.

Embodiment 2

[0032] Mix 2ml of tetraethylorthosilicate (TEOS), 4ml of ethanol (ETOH) and 2ml of 1M hydrochloric acid solution (HCl) and stir evenly to obtain a TEOS hydrolysate; add 0.1g of TiO 2 Disperse uniformly by ultrasonic in 1ml of water, then mix with 0.08ml of the above TEOS hydrolyzate and stir evenly; slowly add 1M sodium hydroxide solution (NaOH) to the above mixed suspension until the mixture is dehydrated into a gel, and stored for 24h to age the gel , And finally drying to obtain gel; grinding the gel to obtain TiO 2 5%SiO 2 Powder samples.

[0033] 20mgTiO 2 5%SiO 2 The photocatalyst is placed in a quartz reaction tube with a volume of ~25ml, the reaction tube is evacuated and filled with pure carbon dioxide gas, and the operation is repeated three times; after that, 0.5ml of evacuated liquid water is injected into the quartz tube with a syringe to keep CO 2 The final pressure is 8KPa; after illuminating the above system (simulating sunlight) for 8h, use a sampling needle to tak...

Embodiment 3

[0035] Mix 2ml of tetraethylorthosilicate (TEOS), 4ml of ethanol (ETOH) and 2ml of 1M hydrochloric acid solution (HCl) and stir evenly to obtain a TEOS hydrolysate; add 0.1g of TiO 2 Disperse uniformly by ultrasonic in 1ml of water, then mix with 0.15ml of the above TEOS hydrolysate and stir evenly; slowly add 1M sodium hydroxide solution (NaOH) to the above mixed suspension until the mixed liquid is dehydrated into gel, and stored for 24h to age the gel , And finally drying to obtain gel; grinding the gel to obtain TiO 2 10%SiO 2 Powder samples. 20mgTiO 2 10%SiO 2 The photocatalyst is placed in a quartz reaction tube with a volume of 25ml, the reaction tube is evacuated and filled with pure carbon dioxide gas, and the operation is repeated three times; after that, 0.5ml of evacuated liquid water is injected into the quartz tube with a syringe to keep CO 2 The final pressure is 8KPa; after illuminating the above system (simulating sunlight) for 8h, use a sampling needle to take o...

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Abstract

The invention belongs to the field of photocatalyst preparation and particularly relates to a TiO<2>@SiO<2> photocatalyst and application of the same to photocatalytic reduction for CO<2>. A preparation method of the photocatalyst comprises the steps that Degussa P25-TiO<2> serves as the material core, the material core is wrapped with a SiO<2> thin layer through a simple sol-gel method, and the TiO<2>@SiO<2> photocatalyst which is of a core-shell structure and different in SiO<2> mass content is obtained. According to the TiO<2>@SiO<2> photocatalyst and the application of the same to photocatalytic reduction for CO<2>, the TiO<2>@SiO<2> photocatalyst is applied to gaseous phase photocatalysis CO<2> reduction for the first time, and the regulation effects of SiO<2> wrapping on activity and selectivity of TiO<2> photocatalytic reduction for CO<2> are explored. The catalyst is simple in preparation method, low in cost, convenient to prepare in an amplified mode and environmentally friendly, when the photocatalyst is used for reduction for CO<2> through photocatalysis, the greenhouse effect can be alleviated, reduction products can be used as fuel, and sustainable development of the environment and energy is facilitated.

Description

technical field [0001] The invention belongs to the field of catalyst preparation and the sustainable development of environment and energy, in particular to a TiO 2 SiO 2 Photocatalyst and its photocatalytic reduction of CO 2 . Background technique [0002] The depletion of fossil fuel reserves and the continuous increase of carbon dioxide emissions in the atmosphere make today's global environmental and energy issues more and more prominent. Artificial photosynthesis, which converts carbon dioxide in the atmosphere into renewable energy through photocatalysis, provides a new way to solve environmental and energy problems. However, the conversion efficiency of this kind of artificial photosynthesis is still very low at present. Based on this, a lot of research is devoted to improving the photoresponse and carrier separation efficiency of traditional photocatalysts to improve catalytic performance, such as semiconductor recombination, noble metal deposition, element dopin...

Claims

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Application Information

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IPC IPC(8): B01J21/08B01J35/10C01B33/12
Inventor 徐艺军袁岚韩创
Owner FUZHOU UNIV
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