A kind of composite catalyst and its preparation method and application
A composite catalyst and titanium-silicon molecular sieve technology, applied in the field of photocatalysis, can solve the problems of high energy consumption, limited photocatalytic efficiency, complicated preparation process, etc., and achieve the effects of low energy consumption, easy operation and simple preparation method.
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
preparation example Construction
[0044] Preparation of TS-1
[0045] TS-1 molecular sieves were synthesized by classical hydrothermal method. Tetraethyl orthosilicate (TEOS) is used as the silicon source, tetrabutyl titanate (TBOT) is used as the titanium source, and tetrapropylammonium hydroxide (TPAOH) solution is used as the template.
[0046] The preparation process includes:
[0047] (1) Silicon source hydrolysis: Under high-speed stirring and nitrogen atmosphere, slowly add accurately weighed TEOS to a certain mass of 15wt% TPAOH aqueous solution, and then continue to stir for 20 minutes until the solution is colorless and transparent, and TEOS is completely hydrolysis;
[0048] (2) Titanium source addition: under high-speed stirring and nitrogen atmosphere, mix TBOT with a certain amount of anhydrous isopropanol in advance, and add it dropwise to the above colorless and transparent solution through a syringe, subject to no precipitation, The whole dropping process lasts about one hour, and continu...
Embodiment 1
[0054] A titanium-silicon molecular sieve with a bismuth loading of 2.5% was prepared. Metal Bi was successfully and evenly loaded on the surface of molecular sieves by photoreaction technology, and 1 gram of TS-1 prepared above was uniformly dispersed in a certain amount of ethanol water (ethanol:water=6:3, v / v), and then weighed 0.05 grams of Bi(NO 3 ) 3 ·5H 2 O was dissolved in this solution and subjected to sonication and stirring to make it well mixed. Then irradiate with a mercury lamp with an optical power of 500W for 5h. After the irradiation, the catalyst is centrifuged, washed three times with deionized water and ethanol to remove unreacted residues, and dried in an oven at 50°C. After drying, the sample (Bi2.5%-TS-1) for grinding. The XRD pattern of the product is as follows figure 1 As shown, the FT-IR diagram is shown in image 3 shown.
Embodiment 2
[0056] A titanium-silicon molecular sieve with a bismuth loading of 5.0% was prepared. Metal Bi was successfully and uniformly loaded on the surface of molecular sieves by photoreaction technology, and 1 gram of TS-1 prepared above was uniformly dispersed in a certain amount of ethanol water (ethanol:water=4:1, v / v), and then weighed 0.1 grams of Bi(NO 3 ) 3 ·5H 2 O was dissolved in this solution and subjected to sonication and stirring to make it well mixed. Then irradiate with a mercury lamp with an optical power of 500W for 5h. After the irradiation, the catalyst is centrifuged, washed three times with deionized water and ethanol to remove unreacted residues, and dried in an oven at 50°C. After drying, the sample (Bi5%-TS-1) for grinding. The XRD pattern of the product is as follows figure 1 As shown, the SEM image is shown in figure 2 As shown, the FT-IR diagram is shown in image 3 shown.
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More