Method for preparing hydrogen by decomposing water through photo-thermal chemical cycle

A photothermal chemistry and water splitting technology, applied in the production of hydrogen and other directions, can solve the problem of high decomposition reaction temperature, and achieve the effects of improving cycle conditions, simple and convenient operation, high photoreactivity and thermochemical characteristics

Active Publication Date: 2015-03-25
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] It can be seen that the key problem of the two-step thermochemical cycl

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) According to the general formula Ti x Zn 1-x o 1+x , where x=0.1, take zinc nitrate Zn(NO 3 ) 2 ·6H 2 O and butyl titanate Ti(OBu) 4 , and then according to the volume ratio Ti(OBu) 4 :H 2 O is 10: 3 to Zn (NO 3 ) 2 ·6H 2 Add deionized water to O to dissolve, and add 4ml glacial acetic acid HAc to inhibit hydrolysis, and then according to the volume ratio Ti(OBu) 4 : EtOH is 1:3, add absolute ethanol EtOH to obtain solution A;

[0027] (2) Ti(OBu) weighed in the previous step 4 In accordance with the volume ratio Ti(OBu) 4 : Add absolute ethanol EtOH at a ratio of 1:3 to obtain solution B, and stir vigorously;

[0028] (3) Slowly pour the solution A obtained in the step (1) into the solution B obtained in the stirring step (2), and keep stirring at room temperature until it gels;

[0029] (4) Dry the colloid obtained in step (3) at 110°C for 12 hours, grind it into fine powder, heat it to 500°C at a heating rate of 2°C / min, and roast it in an air atmos...

Embodiment 2

[0035] (1) According to the general formula Ti x Zn 1-x o 1+x , where x=0.5, take zinc nitrate Zn(NO 3 ) 2 ·6H 2 O and butyl titanate Ti(OBu) 4, and then according to the volume ratio Ti(OBu) 4 :H 2 O is 10: 3 to Zn (NO 3 ) 2 ·6H 2 Add deionized water to O to dissolve, and add 5ml glacial acetic acid HAc to inhibit hydrolysis, and then according to the volume ratio Ti(OBu) 4 : EtOH is 1:3, add absolute ethanol EtOH to obtain solution A;

[0036] (2) Ti(OBu) weighed in the previous step 4 In accordance with the volume ratio Ti(OBu) 4 : Add absolute ethanol EtOH at a ratio of 1:3 to obtain solution B, and stir vigorously;

[0037] (3) Slowly pour the solution A obtained in the step (1) into the solution B obtained in the stirring step (2), and keep stirring at room temperature until it gels;

[0038] (4) Dry the colloid obtained in step (3) at 110°C for 12 hours, grind it into fine powder, heat it to 500°C at a heating rate of 2°C / min, and roast it in an air atmosp...

Embodiment 3

[0044] (1) According to the general formula Ti x Zn 1-x o 1+x , where x=0.9, take zinc nitrate Zn(NO 3 ) 2 ·6H 2 O and butyl titanate Ti(OBu) 4 , and then according to the volume ratio Ti(OBu) 4 :H 2 O is 10: 3 to Zn (NO 3 ) 2 ·6H 2 Add deionized water to O to dissolve, and add 6ml of glacial acetic acid HAc to inhibit hydrolysis, and then according to the volume ratio Ti(OBu) 4 : EtOH is 1:3, add absolute ethanol EtOH to obtain solution A;

[0045] (2) Ti(OBu) weighed in the previous step 4 In accordance with the volume ratio Ti(OBu) 4 : Add absolute ethanol EtOH at a ratio of 1:3 to obtain solution B, and stir vigorously;

[0046] (3) Slowly pour the solution A obtained in the step (1) into the solution B obtained in the stirring step (2), and keep stirring at room temperature until it gels;

[0047] (4) Dry the colloid obtained in step (3) at 110°C for 12 hours, grind it into fine powder, heat it to 500°C at a heating rate of 2°C / min, and roast it in an air at...

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Abstract

The invention relates to hydrogen preparation by photolysis of water and aims to provide a method for preparing hydrogen by decomposing water through a photo-thermal chemical cycle. The method comprises the following steps: preparing a solution A with zinc nitrate, deionized water, glacial acetic acid and absolute ethyl alcohol; preparing a solution B with butyl titanate and absolute ethyl alcohol, and pouring the solution A into the solution B and stirring into gel; after the gel is dried and ground into fine powder, heating for roasting, and thus obtaining a binary composite metal oxide; after the binary composite metal oxide is irradiated by a light source for reaction, heating and introducing vapor for reaction to generate H2. The method combines photochemistry with thermochemistry and utilizes the characteristic that the titanium and zinc binary composite metal oxide is irradiated by light at normal temperature and pressure to be decomposed into a low-valent metal oxide and oxygen, so that the temperature needed by the first step of the thermochemical cycle is greatly reduced, and the cyclic condition is improved.

Description

technical field [0001] The invention relates to the field of hydrogen production by photolysis of water, in particular to a method for producing hydrogen by photothermochemical cycle decomposition of water. Background technique [0002] As a clean and efficient secondary energy carrier, hydrogen energy has the characteristics of rich sources, light weight, high calorific value, green environmental protection, various utilization forms and storage methods, etc. It can not only meet the needs of low-carbon development at the current stage, but also be play an important role in the future energy landscape. The large-scale, efficient and low-cost production of hydrogen is the key problem that must be solved first. Hydrogen production from fossil fuels is the most important method at this stage, and the technology is relatively mature. This method relies on fossil fuels and emits carbon dioxide, and its subsequent development is limited. Biomass hydrogen production is rich in r...

Claims

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Application Information

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IPC IPC(8): C01B3/04
CPCY02E60/36
Inventor 张彦威王智化岑可法周俊虎刘建忠杨卫娟周志军黄镇宇程军
Owner ZHEJIANG UNIV
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