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Preparation method of demercuration catalyst for non-metal-modified one-dimensionally structured titanium dioxide

A titanium dioxide and non-metal technology, which is applied in the field of non-metal ion modified one-dimensional structure TiO2 catalyst and its preparation, and achieves the effect of simple process, easy control and high-efficiency catalysis

Active Publication Date: 2011-04-13
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method also does not involve the one-dimensional structure of TiO 2 carbon, sulfur and halogen (chlorine, bromine, iodine) modification

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Raw material molar ratio is nano TiO 2 :NaOH:C 2 h 5 OH=1:13:0.5, add nano-TiO to 12mol / L NaOH solution 2 , stirred for 3 hours, hydrothermally reacted at 180°C for 24 hours, washed with 5mol / L hydrochloric acid until pH ≤ 2, then washed with deionized water until pH = 7, added to pure ethanol solution after suction filtration, stirred for 2 hours, and aged for 12 hours . Dry it at 80°C, grind it into a solid sample, and then burn it at 200°C for 2 hours to prepare C-doped titanium dioxide nanotubes. Load it on a glass plate as a catalyst to photocatalytically oxidize 100ppb of Hg in industrial waste gas or boiler flue gas 0 , using a cold atomic fluorescence spectrometer enriched with gold mesh to detect Hg in the flue gas at the import and export 0 Concentration, its oxidation rate reaches 85%.

Embodiment 2

[0019] Raw material molar ratio is nano TiO 2 :NaOH:CH 3 OH:CO(NH 2 ) 2 =1:8:0.3:0.2, add nano-TiO to 8mol / L NaOH solution 2 , stirred for 3 hours, hydrothermally reacted at 100°C for 48 hours, washed with 2mol / L hydrochloric acid until pH ≤ 2, then washed with deionized water until pH = 7, added to pure methanol solution after suction filtration, stirred for 3 hours, and aged for 12 hours . Dry it at 60°C, grind it into a solid sample, and then burn it at 300°C for 2 hours to prepare C and N co-doped titanium dioxide nanotubes. Load it on glass fiber as a catalyst to photocatalytically oxidize 100ppb of Hg in industrial waste gas or boiler flue gas 0 , using a cold atomic fluorescence spectrometer enriched with gold mesh to detect Hg in the flue gas at the import and export 0 Concentration, its oxidation rate reaches 69%.

Embodiment 3

[0021] Raw material molar ratio is nano TiO 2 :NaOH:C 2 h 5 OH: NH 2 CSNH 2 =1:12:0.4:0.6, add nano-TiO to 10mol / L NaOH solution 2 , stirred for 3 hours, hydrothermally reacted at 150°C for 24 hours, washed with 0.2 mol / L hydrochloric acid until pH ≤ 2, then washed with deionized water until pH = 7, added to pure ethanol solution after suction filtration, stirred for 5 hours, and aged 18h. Dry it at 100°C, grind it into a solid sample, and then burn it at 500°C for 2 hours to prepare C, N, S co-doped titania nanotubes. Load it on glass fiber cloth as a catalyst to photocatalytically oxidize 100ppb of Hg in industrial waste gas or boiler flue gas 0 , using a cold atomic fluorescence spectrometer enriched with gold mesh to detect Hg in the flue gas at the import and export 0 Concentration, its oxidation rate reaches 95%.

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Abstract

The invention provides a demercuration catalyst for non-metal ion-modified titanium dioxide and a preparation method thereof, wherein a titanium dioxide nanotube is used as an active main body, a non-metal is used as a modifier and a non-metal doped titanium dioxide nanotube photocatalyst is prepared by subjecting into a hydrothermal reaction, immersing, aging, drying, grinding and firing. The titanium dioxide nanotube is selected from the group consisting of rutile type titanium dioxide nanotube, anatase type titanium dioxide nanotube and the mixture type titanium dioxide nanotube thereof; the non-metallic salt modifier is selected from the group consisting of methanol, ethanol, urea, thiourea, hydrochloric acid, hydrogen bromide, iodic acid, bromate, iodate and the mixture composed of a plurality of materials above. The preparation method has the advantages that the method is simple and is easy to be mastered, the non-metal doped titanium dioxide nanotube photocatalyst which is prepared by means of the method can be used for efficiently catalyzing and oxidizing elemental mercury of smoke and cannot be inactivated easily.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to a non-metallic ion-modified one-dimensional structure TiO used for removing zero-valent mercury from flue gas 2 A catalyst and a preparation method thereof, the catalyst is suitable for zero-valent mercury treatment of coal-burning, oil-fired boilers and flue gas of industrial kilns. Background technique [0002] Due to its high toxicity, bioaccumulation and persistence, mercury has caused great harm to the ecological environment and human health in the process of ecosystem cycle. Mercury is mainly in the form of gaseous elemental mercury (Hg 0 ), gaseous divalent mercury (Hg 2+ ) and particulate mercury (Hg P , referring to mercury attached to particulate matter) exists in three forms. Among them, zero-valent mercury can exist stably in the atmosphere for a long time after being discharged, and it is very easy to cause global mercury pollution. Although the ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01D53/86B01D53/64
Inventor 王海强吴忠标周思瑶刘越莫建松
Owner ZHEJIANG UNIV
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