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Method for preparing noble metal modified one-dimensional titanium dioxide Hg-removing catalyst

A technology of titanium dioxide and precious metals, which is applied in the field of noble metal single substance modified one-dimensional structure TiO2 photocatalyst and its preparation, which can solve the problems of not having one-dimensional structure, and achieve the effect of simple process, easy mastery and high-efficiency catalysis

Active Publication Date: 2011-02-02
ZHEJIANG UNIV
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Problems solved by technology

The patent document with publication number 200810196528.5 (invention name: a preparation method of noble metal modified titanium dioxide photocatalyst) discloses a preparation method of noble metal modified titanium dioxide photocatalyst, but the catalyst structure is granular TiO 2 Photocatalyst, no one-dimensional structure

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  • Method for preparing noble metal modified one-dimensional titanium dioxide Hg-removing catalyst

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Embodiment 1

[0020] Raw material molar ratio is nano TiO 2 :NaOH:AgNO 3 : methanol = 1: 1: 0.001: 200, add nano-TiO to 0.5mol / L NaOH solution 2 , stirred for 2 hours, heated at 80°C for 48 hours, washed with 0.05mol / L hydrochloric acid until pH ≤ 2, then washed with deionized water until pH = 7, dried at 80°C, ground into a solid sample, and then dried at 400 Calcined at ℃ for 3h to prepare titanium dioxide nanotubes, see figure 1 .

[0021] The above titanium dioxide nanotubes, AgNO 3 and methanol to form a suspension, and ultrasonically disperse for 10 minutes. Under a helium atmosphere, 125w high-pressure mercury lamp was irradiated with ultraviolet rays for 11 hours, dried at 80° C., and ground to obtain Ag-doped titanium nanotubes. Load it on the mesoporous molecular sieve 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...

Embodiment 2

[0023] Raw material molar ratio is nano TiO 2 : NaOH: PdCl: Propanol = 1: 1: 0.01: 10, add nano-TiO to 10mol / L NaOH solution 2 , stirred for 2 hours, heated at 180°C for 12 hours, washed with 1mol / L hydrochloric acid until pH ≤ 2, then washed with deionized water until pH = 7, dried at 100°C, ground into a solid sample, and then dried at 500°C The titanium dioxide nanotubes were obtained by calcining for 2 hours.

[0024] The above-mentioned titanium dioxide nanotubes, PdCl and propanol were formulated into a suspension, and dispersed by ultrasonic for 15 minutes. Under a helium atmosphere, 200W high-pressure mercury lamp was irradiated with ultraviolet light for 18h, dried at 100°C, and ground to obtain Ag-doped titanium 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...

Embodiment 3

[0026] Raw material molar ratio is nano TiO 2 :NaOH:H 2 PtCl 6: propylene glycol = 1: 9: 0.05: 50, add nanometer TiO in the NaOH solution of 12mol / L 2 , stirred for 5 hours, heated at 160°C for 12 hours, washed with 8mol / L hydrochloric acid until pH ≤ 2, then washed with deionized water until pH = 7, dried at 60°C, ground into a solid sample, and then heated at 300°C Calcined at lower temperature for 4h to prepare titanium dioxide nanotubes.

[0027] The above titanium dioxide nanotubes, H 2 PtCl 6 and propylene glycol to make a suspension, and ultrasonically disperse for 10 minutes. Under an argon atmosphere, 300W high-pressure mercury lamp ultraviolet light was irradiated for 12h, dried at 60°C, and ground to obtain Pt-doped titanium 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 a...

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Abstract

The invention discloses a method for preparing a noble metal modified one-dimensional titanium dioxide Hg-removing catalyst. The method comprises the following steps of: by taking a titanium dioxide nanotube as an active main body and a noble metal salt or a nonmetal modifier as a modifier, heating in water, roasting, optically reducing, drying and grinding to prepare the noble metal elementary substance modified titanium dioxide nanotube photocatalyst. The nano titanium dioxide is in a rutile type, an anatase type or a mixed type of rutile and anatase; the noble metal salt is one or mixture of a plurality of silver nitrate, palladium chloride, palladium nitrate, chloroplatinic acid or chloroauric acid; and a photo-reduction sacrifice agent is one or mixture of a plurality of methanol, ethanol, ethylene glycol, propanol, isopropanol or propylene glycol. The invention is simple in process, easy to master and not easy to inactivate; and the prepared titanium dioxide nanotube and the noble metal elementary substance modified titanium dioxide nanotube photocatalyst can efficiently catalyze and oxidize Hg elementary substances in flue gas.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to a noble metal element modified one-dimensional structure TiO used for photocatalytic oxidation-adsorption removal of elemental mercury in flue gas 2 A photocatalyst and a preparation method thereof, the catalyst is suitable for the treatment of zero-valent mercury in 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/06B01D53/64B01J23/38B01J20/30B01D53/86
Inventor 王海强吴忠标周思瑶刘越莫建松
Owner ZHEJIANG UNIV
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