Preparation method and application of Mn and Pd doped TiO2 catalyst

A catalyst, CO2 technology, used in catalysts, carbon compound catalysts, chemical instruments and methods, etc., can solve the problems of inability to effectively induce reduction and oxidation reactions, low application value, low utilization of light energy, etc., to achieve strong multi-purpose performance, convenience of transportation and storage, improved application value, and high selectivity

Active Publication Date: 2019-04-16
FUZHOU UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Photocatalytic reduction of CO using semiconductors 2 It is a very promising technical approach to alleviate the problem of carbon emissions. On the one hand, it is possible to reduce CO in the atmosphere. 2 Gas content solves environmental problems; on the other hand CO 2 The CO, CH contained in the reduction product 4 、CH 3 OH, C 2 h 5 OH can be used not only as fuel, but also as basic chemical raw materials, which provides a reference for solving energy shortages. It reduces energy consumption, and it is more likely to develop light energy with low utilization rate in the form of photocatalysis, but semiconductor photocatalysis generally has the following disadvantages: narrow photoresponse range, resulting in low light energy utilization rate; photogenerated electron holes The recombination is too fast, and the reduction and oxidation reactions cannot be effectively induced; some catalysts still have photocorrosion phenomenon; most photocatalytic reactions can only produce C 1 Gas phase products, these products have low application value and are inconvenient to transport, store and use, so it is necessary to improve the performance of the catalyst

Method used

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  • Preparation method and application of Mn and Pd doped TiO2 catalyst
  • Preparation method and application of Mn and Pd doped TiO2 catalyst
  • Preparation method and application of Mn and Pd doped TiO2 catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) At room temperature and pressure, add 3.133 mL of deionized water and 1 mL of 12 mol L to 40 mL of ethanol. -1 of concentrated hydrochloric acid, 0.0347g of MnCl 2 ·4H 2 O and 0.867mL 6mg·mL -1 PdCl 2 Then, 12 mL of tetrabutyl titanate was added dropwise to the vigorously stirred solution until a gel was formed. The obtained gel was dried in an oven at 80 °C for 12 h, and aged at room temperature for 24 h to obtain the oxidized state. Mn, Pd doped TiO 2 .

[0030] 2) The obtained oxidation state Mn and Pd doped TiO 2 Placed in a quartz reactor, passed hydrogen, and reacted at 350 ° C for 2 h. That is to obtain low-valence and elemental Mn, Pd-doped TiO 2 catalyst.

[0031] figure 1 is the obtained Mn / Pd-TiO 2 Transmission electron microscope image of the catalyst. from figure 1 It can be seen that Mn / Pd-TiO 2 The catalyst exhibits a nano-block-packed morphology, and this result may be helpful for the adsorption of reactants, for CO 2 activation has a cert...

Embodiment 2

[0044] Mn-TiO 2 The preparation of catalyst, the concrete steps are:

[0045] 1) At room temperature and pressure, add 4 mL of deionized water and 1 mL of 12 mol L to 40 mL of ethanol. -1 of concentrated hydrochloric acid, 0.0347g of MnCl 2 ·4H 2 O; then, 12 mL of tetrabutyl titanate was added dropwise to the vigorously stirred solution until a gel was formed, and the resulting gel was dried in an oven at 80 °C for 12 h, and aged at room temperature for 24 h to obtain the oxidized state. Mn-doped TiO 2 .

[0046] 2) The obtained oxidation state Mn-doped TiO 2 Placed in a quartz reactor, passed hydrogen, and reacted at 350 ° C for 2 h. That is, low-valence Mn-doped TiO 2 catalyst.

Embodiment 3

[0048] Pd-TiO 2 The preparation of catalyst, the concrete steps are:

[0049] 1) At room temperature and pressure, add 3.133 mL of deionized water and 1 mL of 12 mol L to 40 mL of ethanol. -1 of concentrated hydrochloric acid and 0.867mL of 6mg·mL -1 PdCl 2 Then, 12 mL of tetrabutyl titanate was added dropwise to the vigorously stirred solution until it formed a gel, and the obtained gel was dried in an oven at 80 °C for 12 h, aged at room temperature for 24 h, and the oxidized state was obtained. Pd-doped TiO 2 .

[0050] 2) The obtained oxidation state Pd-doped TiO 2 Placed in a quartz reactor, passed hydrogen, and reacted at 350 ° C for 2 h. That is to obtain low-valence and elemental Pd-doped TiO 2 catalyst.

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Abstract

The invention discloses a preparation method and application of an Mn and Pd doped TiO2 catalyst. The catalyst comprises TiO2 with optical excitation activity and Mn and Pd elements doped in the TiO2,and the content of the Mn element in the catalyst is 0.2-2wt% and the content of the Pd element in the catalyst is 0.2-2wt% according to the 100 mass percentages of TiO2. The preparation method includes the following steps that oxidized Mn and Pd doped TiO2 is prepared through a sol-gel method; H2 is used for reducing oxidized Mn and Pd into low-order state or simple-substance Mn and Pd; comparedwith CO, CH4 and other products which are generated through a catalytic reaction of most other similar catalysts, in the scheme, a photothermal coupling effect is used for improving the performance when catalytic reduction of CO2 is conducted, a product C2H5OH has higher performance of multiple purposes and transportation and storage convenience, and the application value of the reaction productis increased; in addition, in the scheme, energy consumption is low, and the selectivity for a C2 product is high.

Description

technical field [0001] The invention relates to the field of energy regeneration, in particular to a Mn and Pd doped TiO 2 The catalyst preparation method and its application. Background technique [0002] In the progress of human civilization and the development of social economy, human beings have over-exploited and utilized natural resources, and fossil energy is rapidly depleting, which will lead to a serious energy crisis. At the same time, due to exhaust emissions, CO 2 Soaring gas concentrations have caused the greenhouse effect, causing glaciers to melt and sea levels to rise; at the same time, it has caused changes in the environment and climate, affecting the habitation and survival of many organisms. Therefore, reducing CO 2 Gas emissions, solving energy and environmental problems is urgent. [0003] Photocatalytic reduction of CO using semiconductors 2 is a very promising technological approach to mitigate carbon emissions, on the one hand, it has the potenti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/656B01D53/86B01D53/62C07C29/159C07C31/08C07C1/02C07C9/04
CPCB01D53/8671B01J23/6562B01J35/004C07C1/02C07C29/159C07C2523/656C07C31/08C07C9/04Y02P20/50
Inventor 戴文新彭挺陈旬员汝胜付贤智
Owner FUZHOU UNIV
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