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Aluminum oxide/titanium oxide heterojunction nano fiber carrier in anti-sintering precious metal catalyst system as well as preparation method and application of carrier

A precious metal catalyst, nanofiber technology, applied in catalyst supports, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problem of catalyst sintering, agglomeration intensification, surface active site decrease, specific surface area Reduce and other problems, to achieve the effect of short cycle, simple process and high porosity

Inactive Publication Date: 2014-08-13
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under high temperature sintering conditions, TiO 2 The crystal grains mature, the particle size increases significantly, and the specific surface area decreases sharply, so that the surface active sites that can be provided to the nano-catalyst drop sharply, resulting in the aggravation of the sintering and agglomeration of the catalyst

Method used

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  • Aluminum oxide/titanium oxide heterojunction nano fiber carrier in anti-sintering precious metal catalyst system as well as preparation method and application of carrier
  • Aluminum oxide/titanium oxide heterojunction nano fiber carrier in anti-sintering precious metal catalyst system as well as preparation method and application of carrier
  • Aluminum oxide/titanium oxide heterojunction nano fiber carrier in anti-sintering precious metal catalyst system as well as preparation method and application of carrier

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] a. Disperse PVP in 10mL of solvent with a concentration of 0.24g / mL; add 3mL of glacial acetic acid; then add isopropyl titanate to prepare a solution with a concentration of 1.1mol / L;

[0035] b. Dissolving aluminum acetylacetonate in acetone solvent to prepare a solution with a concentration of 0.37mol / L;

[0036]c. Mix and stir the above two solutions according to the Al:Ti molar ratio of 1:5, then draw the prepared precursor solution into the syringe 2mL, insert the syringe into the micro-injection pump, connect the electrodes, adjust the flow rate to 0.3mL / h, and the electrostatic field voltage The voltage is 15kV, the distance between the needle and the receiver is 10cm, and the humidity in the control room is 30%, then nanofibers can be obtained;

[0037] d. The nanofibers obtained by electrospinning were sintered in a muffle furnace at 450°C for 270min, and the heating rate was 2.8°C / min; a new type of Al 2 o 3 / TiO 2 Heterojunction nanofibrous support; Al 2...

Embodiment 2

[0041] a. Disperse PVP in 10mL of solvent with a concentration of 0.24g / mL; add 3mL of glacial acetic acid; then add isopropyl titanate to prepare a solution with a concentration of 1.1mol / L;

[0042] b. Dissolving aluminum acetylacetonate in acetone solvent to prepare a solution with a concentration of 0.31mol / L;

[0043] c. Mix and stir the above two solutions according to the Al:Ti molar ratio of 1:10, then suck the prepared precursor solution into the syringe 2mL, insert the syringe into the micro-injection pump, connect the electrode, adjust the flow rate to 0.3mL / h, and the electrostatic field voltage The voltage is 15kV, the distance between the needle and the receiver is 10cm, and the humidity in the control room is 30%, then nanofibers can be obtained;

[0044] d. The nanofibers obtained by electrospinning were sintered in a muffle furnace at 1000°C for 60 minutes, and the heating rate was 2.8°C / min; a new type of Al 2 o 3 / TiO 2 Heterojunction nanofibrous support;...

Embodiment 3

[0048] a. Disperse PVP in 10mL of ethanol with a concentration of 0.24g / mL; add 3mL of glacial acetic acid; then add isopropyl titanate to prepare a solution with a concentration of 1.1mol / L;

[0049] b. Dissolving aluminum acetylacetonate in acetone solvent to prepare a solution with a concentration of 0.37mol / L;

[0050] c. Mix and stir the above two solutions according to Al:Ti molar ratio of 1:5, then draw the prepared precursor solution into the syringe 2mL, insert the syringe into the micro-injection pump, connect the electrode, adjust the flow rate to 0.3mL / h, and the electrostatic field The voltage is 15kV, the distance between the needle and the receiver is 10cm, and the humidity in the control room is 30%, then nanofibers can be obtained;

[0051] d. The nanofibers obtained by electrospinning were sintered in a muffle furnace at 350°C for 270min, and the heating rate was 2.8°C / min; a new type of Al 2 o 3 / TiO 2 Heterojunction nanofiber carrier;

[0052] e. Al 2 ...

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Abstract

The invention discloses an aluminum oxide / titanium oxide heterojunction nano fiber carrier in an anti-sintering precious metal catalyst system as well as a preparation method and application of the carrier. The preparation method comprises the following steps: dispersing PVP into ethyl alcohol, stirring and dissolving to obtain a PVP ethyl alcohol solution; taking glacial acetic acid to be added into the solution, and adding titanium isopropoxide; dispersing aluminum acetylacetonate into an organic solvent, mixing and stirring the two solutions to obtain a precursor solution, adopting an electrostatic spinning method, indrawing the precursor solution in an injector, inserting the injector into a trace injection pump, connecting with an electrode, adjusting the flow speed and the voltage of an electrostatic field, wherein the distance from a syringe needle to a receiver is 5-15cm, and controlling the indoor humidity to be 30-50%, thereby obtaining nano fibers; sintering the nano fibers obtained by the electrostatic spinning method in a muffle furnace, thereby obtaining the aluminum oxide / titanium oxide heterojunction nano fiber carrier. The catalyst carrier disclosed by the invention is short in preparation cycle, simple in process, low in energy consumption, high in productivity, and good in reproducibility.

Description

technical field [0001] The invention belongs to the technical field of preparing nanofibers by electrospinning, and in particular relates to a method for preparing TiO2 suitable for supporting catalysts such as noble metal nanocrystals. 2 / Al 2 o 3 Method for Composite Nanofibers. Background technique [0002] Existing technology: Catalyst activity is very important with its size, shape, specific surface area, and exposed crystal facets. Therefore, highly active catalysts usually control their particle size at the nanoscale. Generally speaking, the smaller the catalyst particle size, the larger the specific surface area and the higher the catalytic activity. However, under gas-phase catalytic reaction conditions, where the reaction temperature is usually higher than 350°C, the specific surface area of ​​catalyst nanocrystals often decreases sharply or even becomes deactivated due to thermal agglomeration. The smaller the particle size of the catalyst, the more severe the...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J32/00B01J23/38B01J23/42B01J23/50B01J23/52
Inventor 代云茜凌丹丹符婉玲郭皓月孙贻白
Owner SOUTHEAST UNIV
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