au/zif-8-tio2 catalyst and its preparation method and application
A ZIF-8, zif-8-tio2 technology, applied in the field of Au/ZIF-8-TiO2 catalyst and its preparation, to achieve the effects of promoting application, improving activity, and simple and easy preparation method
Active Publication Date: 2018-08-17
FUZHOU UNIV
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Problems solved by technology
[0005] The object of the present invention is to provide a kind of Au / ZIF-8-TiO 2 The catalyst and its preparation method and application aim at the problem that the traditional Au-supported catalyst needs to catalyze the oxidation of CO at a higher temperature. By introducing porous and large specific surface area ZIF-8 as an auxiliary agent, the carrier TiO 2 Modification strengthens the interaction between the metal and the carrier, and red shifts the absorption band edge in the visible region to improve the Au / TiO 2 The performance of catalytic oxidation of CO under visible light, thereby improving the low-temperature activity of this type of catalyst; and the preparation method of the catalyst is simple and easy, which is conducive to popularization and application
Method used
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[0025] Example Au / ZIF-8-TiO 2 Catalyst preparation
[0026] (1) Add 1.66g zinc nitrate hexahydrate and 10.6g 2-methylimidazole to 114mL methanol solution successively, stir magnetically at room temperature for 48h, then centrifuge, wash, and vacuum dry at 80℃ for 12h to obtain ZIF-8;
[0027] (2) Add 0.1g of ZIF-8 prepared in step (1) to 280mL ethanol solution containing 14mL titanium trichloride and 1.68g NaOH, solvothermally react at 150°C for 18h, then centrifuge, wash, and dry at 80°C for 12h , Get ZIF-8-TiO 2 Carrier
[0028] (3) Combine the carrier prepared in step (2) and 2 mL of HAuCl containing Au at a concentration of 0.01 g / mL 4 Solution (1.0gHAuCl 4 ·3H 2 Dissolve O in deionized water and dilute to 100 mL) add it to 100 mL of water, adjust its pH to 10 with 0.1 mol / L NaOH, stir and react for 1 hour, use 30 mL of pH 10 with 0.1 mol / L of NaOH NaBH 4 The solution was stirred and reacted at room temperature for 7 hours for reduction treatment, and then centrifuged and washed...
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Abstract
The invention discloses Au / ZIF-8-TiO2 catalyst and a preparation method and application thereof. The method comprises: adding a metal organic frame material ZIF-8 (zeolite imidazate-like frame material) made by a self-assembly process into a precursor of TiO2 to obtain ZIF-8 modified TiO2 carrier, and dispersing Au nanoparticles as an active ingredient to the surface of the ZIF-8 modified TiO2 carrier to obtain high-dispersion supported-type Au catalyst Au / ZIF-8-TiO2. By introducing ZIF-8, the activity for the catalyst to catalytically oxidize CO in visible light is improved, and the catalyst applies to CO removal at normal temperature in air or other occasions; the preparation method is simple and easy and is convenient to popularize and apply.
Description
Technical field [0001] The invention belongs to the technical field of visible light catalytic oxidation of CO, and specifically relates to an Au / ZIF-8-TiO 2 Catalyst and its preparation method and application. Background technique [0002] CO is a typical flammable, explosive, and toxic gas, which is easily combined with hemoglobin (Hb) in the blood. When the air contains ppm-level CO, it will cause human body poisoning; when the CO content in the air reaches 400ppm, people will feel headache, fatigue, nausea, etc.; when the content reaches 600ppm, people will experience palpitations and hyperthyroidism, accompanied by Collapse; when the content is greater than 1000ppm, people will appear lethargic, convulsions, and will suffocate to death in severe cases. In the most researched hydrogen fuel cell, a small amount of CO will poison the catalyst and electrode. The most typical one is the proton membrane exchange fuel cell (PEMFC). The 0.5-1.0 vol% CO in the reformed gas will caus...
Claims
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IPC IPC(8): B01J31/38B01J35/10B01D53/86B01D53/62
CPCB01D53/864B01D2251/102B01D2255/802B01J31/0244B01J31/1691B01J31/38B01J35/004B01J35/10B01J2231/70Y02A50/20
Inventor 戴文新张玉娟陈旬王绪绪刘平付贤智
Owner FUZHOU UNIV