Method for producing hydrogen and oxygen through solar photocatalysis of water based on metal oxide photocatalyst

A photocatalyst and oxide technology, which is applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc. Many problems, such as low catalyst stability, can achieve the effect of simple loading method, simple preparation process and wide absorption spectrum range.

Inactive Publication Date: 2014-12-31
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this catalyst is that the catalyst has low stability and low activity, and because the catalytic activity is closely related to the ratio of multicomponent components, the requirements for material preparation are very high.
However, up to now, there has been no report on the direct use of it in photocatalysis to achieve the complete decomposition of water to produce hydrogen and oxygen without adding any auxiliary reagents.
[0009] It can be seen that it is particularly important to use semiconductor photocatalysis to fully split water to produce hydrogen and oxygen. However, the current photocatalyst systems that can fully split water are still limited, and most of them are complex multi-element nitrogen oxides and multi-element metal oxides. The preparation process is complex and subject to many constraints
A single metal oxide with a simpler structure has greater advantages, and there are no reports of such materials being directly used to achieve pure water splitting

Method used

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  • Method for producing hydrogen and oxygen through solar photocatalysis of water based on metal oxide photocatalyst
  • Method for producing hydrogen and oxygen through solar photocatalysis of water based on metal oxide photocatalyst
  • Method for producing hydrogen and oxygen through solar photocatalysis of water based on metal oxide photocatalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Active component rutile phase TiO 2 Preparation of:

[0043] Mix 6ml of HCl with a concentration of 37wt% and 15ml of titanium isopropoxide for hydrothermal synthesis. The hydrothermal synthesis condition is 180°C, and the reaction is 36h. figure 1 Its XRD diffraction pattern, figure 2 Its scanning electron microscope photograph.

Embodiment 2

[0045] Evaluation of preparation of single noble metal co-catalyst by in situ photodeposition and its photocatalytic reaction

[0046] Add 0.050 g of catalyst and a metal precursor with a single-component metal content of 0.2 wt % in 150 ml of deionized water. The amount added is: 0.27ml H 2 PtCl 6 solution (0.37mg / ml), 0.14ml AgNO 3 solution (0.74mg / ml), 0.44ml HAuCl 4 solution (0.23mg / ml), 0.52ml RhCl 3 solution (0.19mg / ml), 0.17ml RuCl 3 One of the solutions (0.59mg / ml). After the air in the system was evacuated, a 300W xenon lamp was used as the light source for photocatalytic reaction. Among them, the co-catalyst is deposited on the catalyst Cat.0 within 10 minutes at the initial stage of the reaction, and the catalysts Cat1, Cat2, Cat3, Cat4 and Cat5 are obtained, and the corresponding co-catalyst components are: Cat1, Pt; Cat2, Ag; Cat3 , Au; Cat4, Rh; Cat5, Ru. The gas phase products obtained by the reaction were detected online by gas chromatography, and the r...

Embodiment 3

[0048] Preparation of two-component cocatalyst and evaluation of its photocatalytic reaction

[0049] In 150ml deionized water, add 0.050g prepared Cat0, 0.27ml H 2 PtCl 6 solution (0.37mg / ml) and a metal precursor with a second component content of 0.1wt%. The amount added is: 0.10mlKMnO 4 solution (0.50mg / ml), 0.085ml RuCl 3 solution (0.588mg / ml), 0.366ml K 3 IrCl 6 solution (0.273mg / ml) and 0.10ml Cr(NO 3 ) 2 One of the solutions (0.50mg / ml). After the air in the system was evacuated, a 300W xenon lamp was used as the light source for photocatalytic reaction. Among them, the co-catalyst is deposited on the catalyst Cat0 in the initial few minutes of the reaction to obtain the catalysts Cat1-1, Cat1-2, Cat1-3, and 1-4. The corresponding cocatalyst components are: Cat1, Pt; Cat1-1, Pt, Mn 3 o 4 ;Cat1-2,Pt,RuO 2 ;Cat1-3,Pt,IrO 2 ;Cat1-4, Pt, Cr 2 o 3 . Cat1-5 uses IrO 2 Prepared by colloidal adsorption, the specific process is to add Cat0 to the prepared IrO ...

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Abstract

The invention provides a method for producing hydrogen and oxygen through solar photocatalysis decomposition of water based on a single metal oxide photocatalyst. An oxide supports a precious metal and transition metal oxide dual-component cocatalyst, so the water decomposition activity is obviously improved, the hydrogen production activity can reach above 24.0L / kg / h, the oxygen production activity can reach above 12.0L / kg / h, and the activity is not obviously reduced after the catalyst is recycled above six times. The method has the advantages of simple preparation process, high activity and stability, and nontoxic and green catalyst, can realize the decomposition of water by solar energy under ultraviolet light to form a clean fuel hydrogen, and allows the product water obtained after the combustion of hydrogen to be recycled, and the catalyst is expected to be used in energy supply of plateaus, outer space spacecrafts and lunar landing plans.

Description

technical field [0001] The invention provides a single metal oxide as an active material, which can be used in the technology of directly decomposing water to produce hydrogen and oxygen by photocatalysis. The preparation process of this technology is simple, the activity and stability are high, and the catalyst is non-toxic and green. It can realize the use of solar energy to decompose water into hydrogen, a clean fuel under ultraviolet light. This catalyst is expected to be used as an energy source for plateaus, outer space spacecraft and moon landing programs supply technology. Background technique [0002] As a clean energy, hydrogen has the advantages of high combustion value and zero pollution emission. It is also a commonly used industrial raw material and is widely used in synthetic ammonia, petroleum hydrocracking, and metallurgical industries. At present, using non-renewable fossil resources as raw materials is the main way to produce hydrogen. The use of fossil ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/04B01J23/42B01J23/46B01J23/50B01J23/52B01J23/656B01J23/652
CPCY02E60/36Y02P20/133Y02P20/584
Inventor 李灿李仁贵种瑞峰黄垒
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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