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Magnetic solid super acid nanotube catalytic agent and preparation method thereof

A technology of solid super acid and titanate nanotubes, which is applied in the directions of light water/sewage treatment, energy and wastewater treatment, etc., can solve the problems of high application cost, inability to industrialize use, low solar energy utilization rate, and difficulty in recycling, etc., and achieves easy industrialization. The effect of production, environmental friendliness and simple preparation process

Inactive Publication Date: 2014-06-11
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, TiO 2 The band gap is wide, the anatase type is 3.2eV, and the rutile type is 3.0eV. It can only be excited by ultraviolet rays with high energy, so its solar energy utilization rate is low.
[0004] In addition, nano-TiO 2 When it is directly made into a catalyst, due to the fine particles, it is easy to form a stable colloid in the liquid-phase catalytic reaction, which is easy to deactivate, difficult to recover, and difficult to recycle, resulting in the current TiO 2 The application cost is high and cannot be used industrially

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A magnetic solid superacid nanotube catalyst, that is, containing SO 4 2- TiO 2 Self-assembled magnetic substance Fe with superparamagnetism on nanotube support 3 o 4 , SO in the magnetic solid superacid nanotube catalyst 4 2- 、TiO 2 Nanotubes and Fe 3 o 4 Calculated in molar ratio, ie SO 4 2- : TiO 2 Nanotube: Fe 3 o 4 It is 0.265:1:0.808.

[0030] The preparation method of above-mentioned a kind of magnetic solid superacid nanotube catalyst specifically comprises the steps:

[0031] (1), put 5g TiO 2 The powder was reacted with 70mL 10mol / L NaOH solution in a 100mL polytetrafluoroethylene-lined hydrothermal reactor at 150°C for 20h, and then cooled to room temperature with 0.1 mol / L HNO 3 The solution was washed until the pH of the filtrate was 7, and then washed with deionized water until there was no NO 3 - , to obtain titanate nanotubes;

[0032] (2) Immerse the titanate nanotubes obtained in step (1) in 0.5mol / L sulfuric acid for 1h, filter, dry...

Embodiment 2

[0035] A magnetic solid superacid nanotube catalyst, that is, containing SO 4 2- TiO 2 Self-assembled magnetic substance Fe with superparamagnetism on nanotube support 3 o 4 , SO in the magnetic solid superacid nanotube catalyst 4 2- 、TiO 2 Nanotubes and Fe 3 o 4 Calculated in molar ratio, ie SO 4 2- : TiO 2 Nanotube: Fe 3 o 4 It is 0.424:1:0.152.

[0036] The preparation method of above-mentioned a kind of magnetic solid superacid nanotube catalyst specifically comprises the steps:

[0037] (1), put 2g TiO 2 Powder (P25 type) and 70mL 10mol / L NaOH solution were hydrothermally reacted in a 100mL polytetrafluoroethylene-lined hydrothermal reactor at 170°C for 20h, cooled to room temperature, and then treated with 0.1 mol / L HNO 3 The solution was washed until the pH of the filtrate was 7, and then washed with deionized water until there was no NO 3 - , to obtain titanate nanotubes;

[0038] (2) Immerse the titanate nanotubes obtained in step (1) in 0.1mol / L su...

Embodiment 3

[0043] A magnetic solid superacid nanotube catalyst, that is, containing SO 4 2- TiO 2 Self-assembled magnetic substance Fe with superparamagnetism on nanotube support 3 o 4 , SO in the magnetic solid superacid nanotube catalyst 4 2- 、TiO 2 Nanotubes and Fe 3 o 4 Calculated in molar ratio, ie SO 4 2- : TiO 2 Nanotube: Fe 3 o 4 It is 0.053:1:0.152.

[0044] The preparation method of above-mentioned a kind of magnetic solid superacid nanotube catalyst specifically comprises the steps:

[0045] (1), put 5g TiO 2 The powder was reacted with 70mL 10mol / L NaOH solution in a 100mL polytetrafluoroethylene-lined hydrothermal reactor at 150°C for 20h, and then cooled to room temperature with 0.1 mol / L HNO 3 The solution was washed until the pH of the filtrate was 7, and then washed with deionized water until there was no NO 3 - , to obtain titanate nanotubes;

[0046] (2), impregnate the titanate nanotubes obtained in step (1) with 0.3mol / L sulfuric acid for 1h, filter...

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Abstract

The invention discloses a magnetic solid super acid nanotube catalytic agent and a preparation method thereof. The magnetic solid super acid nanotube catalytic agent is formed by self-assembling of a magnetic matter Fe3O4 with superparamagnetism on a TiO2 nanotube carrier containing SO4<2->. The preparation method includes subjecting titanic acid nanotubes to dipping treatment by using sulfuric acid, roasting the titanic acid nanotubes to obtain TiO2 nanotube super acid, performing self-assembling of the Fe3O4 by using a one-pot method, separating precipitates by using a magnetic separation technology, and subjecting the precipitates to vacuum drying to obtain the magnetic solid super acid nanotube catalytic agent of a TiO2 nanotube, wherein the magnetic solid super acid nanotube catalytic agent contains the SO4<2-> and is provided with the superparamagnetism. According to the magnetic solid super acid nanotube catalytic agent, by means of magnetism, the separation and recycle of the catalytic agent and reactants are facilitated, and the catalytic agent has a high catalytic activity.

Description

technical field [0001] The invention relates to a magnetic solid superacid nanotube catalyst and a preparation method thereof. Background technique [0002] Lewis acid catalyst (AlCl 3 and BF 3 ) has important applications in many industrial reactions, such as the synthesis of ethylbenzene, cumene, linear alkylbenzene and aromatic ketones. Although such protic acid catalysts are highly active, they have serious disadvantages such as easy waste generation, difficult product separation of the catalyst, and easy corrosion of equipment. [0003] From the perspective of environmental friendliness, the use of solid acid catalysts has been able to minimize the emission of toxic by-products. At the same time, metal oxides have become the most widely used catalyst species in heterogeneous catalytic reactions due to their simultaneous acid / alkaline and redox properties. TiO was first discovered by Japanese scholars Fujishima and Honda in 1972. 2 Single crystal as an electrode can...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/053C02F1/30C02F1/32
CPCY02W10/37
Inventor 黄宇轩张娜房永征王中驰申晓璇
Owner SHANGHAI INST OF TECH
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