Copper oxide and titanium oxide heterojunction composite catalyst as well as preparation method and application thereof

A composite catalyst and titanium dioxide technology, which is applied in the field of composite materials and photocatalysis technology, and can solve problems such as limiting reaction activity.

Inactive Publication Date: 2019-11-15
INNER MONGOLIA AGRICULTURAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the existing heterojunction composite catalysts are cocatalysts in TiO 2 The non-selective deposition on the surface of nanoparticles causes part of the co-catalyst to become the recombination center of photogenerated electrons and holes, which limits the improvement of the reactivity. Therefore, how to realize the co-catalyst in anatase TiO 2 Selective deposition on the surface is the key to realize the efficient conversion of photocatalytic methanol to methyl formate

Method used

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  • Copper oxide and titanium oxide heterojunction composite catalyst as well as preparation method and application thereof
  • Copper oxide and titanium oxide heterojunction composite catalyst as well as preparation method and application thereof
  • Copper oxide and titanium oxide heterojunction composite catalyst as well as preparation method and application thereof

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Embodiment 1

[0019] The preparation of embodiment 1 cupric oxide and titania heterojunction composite catalyst:

[0020] At room temperature, 5 mL of butyl titanate was added to 20 mL of acetic acid, stirred vigorously for 10 min, the mixed solution became colorless and transparent, and then the mixed solution was transferred to a hydrothermal reactor lined with polytetrafluoroethylene and placed in an oven In the process, the temperature was raised to 200°C at a heating rate of 5°C / min, kept at a constant temperature of 200°C, reacted for 24 hours, and then cooled naturally to room temperature. The obtained product was centrifugally filtered, and the precipitate was washed three times with deionized water and once with absolute ethanol, and then dried at 80°C for 12 hours to obtain anatase TiO 2 spindle, labeled TiO 2 -P; 37.71mL, 62.86mL, 88.00mL, 125.71mL of 0.01mol·L - 1 Cu(NO 3 ) 2 The solution was added to a 500 mL round bottom beaker, followed by 100 mL of deionized water, and ...

Embodiment 2

[0024] Embodiment 2 Copper oxide and titanium dioxide composite catalyst photocatalytic methanol prepare methyl formate reaction:

[0025]Photocatalytic oxidation of methanol to formic acid was carried out in a continuous flow aluminum alloy reactor. Apply the catalyst evenly on three rectangular glass slides of appropriate size, then place the slides in the reaction tank, and then place a piece of quartz glass on the reaction tank to seal the reaction tank. Install a 500W high-pressure mercury lamp above the quartz glass, so that the glass slide coated with the catalyst side is completely exposed to the mercury lamp. The entire reaction uses cooling water circulation to control the reaction temperature at 25-45°C. The mixture of methanol / oxygen / nitrogen was introduced from above the catalyst for reaction. The mixed gas is made of nitrogen bubbling through the low-temperature methanol bubbler and mixed with the other two measured nitrogen and oxygen. The volume percentage of ...

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Abstract

The invention discloses a copper oxide and titanium oxide heterojunction composite catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a copper nitrate solution with an anatase TiO2 spindle body, adding a sodium borohydride reducing agent, regulating and controlling coordination modes and action force of CuO nanoparticles and {101} and {001} crystal surfaces, and selectively depositing the CuO nanoparticles onto {101} crystal surfaces, so as to establish a copper oxide and titanium oxide heterojunction composite catalyst system. In a reaction that methyl formate is prepared from methanol through photo-catalytic oxidation of a catalyst, the conversion rate of the methanol is up to 95% at 25 DEG C, and the selectivityof the methyl formate is as high as 85%. The copper oxide and titanium oxide heterojunction composite catalyst is reasonably established, separation of photoproduction electrons and holes is achievedto the maximum extent under synergism of heterogeneous interfaces, and the reaction activity and the selectivity can be further improved when the methyl formate is prepared from the methanol throughphoto-catalytic oxidation at a low temperature of 15-45 DEG C.

Description

technical field [0001] The invention belongs to the technical field of composite materials and photocatalysis, and in particular relates to a copper oxide and titanium dioxide heterojunction composite catalyst and its preparation method and application. Titanium TiO 2 The {101} crystal face of the spindle body rationally constructs a heterojunction composite catalyst of copper oxide and titanium dioxide, which promotes the separation of photogenerated electrons and holes to the greatest extent, and realizes the photocatalytic preparation of formic acid from methanol at low temperature ((15-45°C) Efficient conversion of esters. Background technique [0002] With the change of global energy structure, the conversion and utilization of coal, natural gas and biomass are closely related to C 1 The development of chemistry has been paid more and more attention, and has become an important way to solve energy problems at this stage and in the future. As an important derivative o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/72C07C67/40C07C69/06
CPCB01J23/72B01J23/002B01J35/004C07C67/40
Inventor 史全全平贵臣巩霞李金梅丁洪晶许辉
Owner INNER MONGOLIA AGRICULTURAL UNIVERSITY
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