PDF Publication Title:
Text from PDF Page: 163
results clearly revealed that the external mSiO2 shell and the void space between the mSiO2 shell and the TS-1 core not only can capture substrate molecules like a pump for enhanced activity, but also adsorb product molecules, and thus posed diffusion resistance for negative selectivity. Table 2. Catalytic activities of various TS-1 catalysts in hydroxylation of phenol a. Entry Catalyst Reaction Time Conv. /% 6.2 16.6 23.7 18.7 24.3 25.2 20.7 HQ/CAT TOF c Product Sel. b /% CAT HQ BQ /h−1 1 1h 2 Pristine TS-1 3h 3 5h 4 1h 5 CS-TS-1@mSiO2 3h 6 5h 7 1h 8 YS-TS-1@mSiO2 3h 9 a Reaction conditions: water as solvent, 10 mL; phenol, 1.0 g (10.63 mmol); phenol/H2O2 molar ratio, 3.0; catalyst mass (containing TS-1), 40 mg (0.017 mmol Ti); temperature, 80 ◦ C; reaction time, 5 h. b CAT: catechol, HQ: hydroquinone, BQ: benzoquinone. c Turnover frequency (TOF): moles of phenol converted per mole of titanium per hour. In order to obtain more details, we performed a kinetic study for the above three catalysts at different reaction times. Obviously, the reaction rate was YS-TS-1@mSiO2 > CS-TS-1@mSiO2 > pristine TS-1 (Entries 1–9). At the initial stage of reaction, because the mSiO2 shell and the void space could capture substrate molecules, the concentration of phenol around active Ti sites was YS-TS-1@mSiO2 > CS-TS-1@mSiO2 > pristine TS-1. Therefore, after reacting for 1 h, the conversions of composite YS-TS-1@mSiO2 and CS-TS-1@mSiO2 were much higher than that of pristine TS-1 (20.7% vs. 18.7% vs. 6.2%). Moreover, the decreasing rate of benzoquinone’s selectivity of pristine TS-1 was faster than that of YS-TS-1@mSiO2 and CS-TS-1@mSiO2. This controlled experiment further confirmed aforementioned diffusion/adsorption effect. This will help us to design other multifunctional zeolites-based nanocomposites for various oxidation reactions. 3. ExperimentalSection 3.1. Chemicals Tetraethylorthosilicate (TEOS, 98%), aqueous ammonia (NH3·H2O, 28%) and cetyltrimethyl-ammonium bromide (CTAB, 99.0%) were purchased from Sinopharm Chemical Reagent Co. Ltd., Shanghai, China. Tetrapropylammonium hydroxide (20%–25%) was obtained from TCI, Shanghai, China. Hydrogen peroxide (H2O2, 30%), phenol (AR) and tetrabutylorthotitanate (TBOT) were obtained from Beijing 10.3 1.5 88.2 0.15 60.7 25.1 14.1 55.1 41.0 3.9 0.74 0.41 29.6 55.8 24.5 19.7 0.44 51.2 38.1 10.7 45.7 49.8 4.5 1.09 0.74 31.5 49.7 24.1 26.2 0.48 24.8 5h 27.6 50.8 38.6 10.6 47.4 47.1 5.5 0.99 0.76 34.4 148PDF Image | Zeolite Catalysis
PDF Search Title:
Zeolite CatalysisOriginal File Name Searched:
Zeolite_Catalysis.pdfDIY PDF Search: Google It | Yahoo | Bing
NFT (Non Fungible Token): Buy our tech, design, development or system NFT and become part of our tech NFT network... More Info
IT XR Project Redstone NFT Available for Sale: NFT for high tech turbine design with one part 3D printed counter-rotating energy turbine. Be part of the future with this NFT. Can be bought and sold but only one design NFT exists. Royalties go to the developer (Infinity) to keep enhancing design and applications... More Info
Infinity Turbine IT XR Project Redstone Design: NFT for sale... NFT for high tech turbine design with one part 3D printed counter-rotating energy turbine. Includes all rights to this turbine design, including license for Fluid Handling Block I and II for the turbine assembly and housing. The NFT includes the blueprints (cad/cam), revenue streams, and all future development of the IT XR Project Redstone... More Info
Infinity Turbine ROT Radial Outflow Turbine 24 Design and Worldwide Rights: NFT for sale... NFT for the ROT 24 energy turbine. Be part of the future with this NFT. This design can be bought and sold but only one design NFT exists. You may manufacture the unit, or get the revenues from its sale from Infinity Turbine. Royalties go to the developer (Infinity) to keep enhancing design and applications... More Info
Infinity Supercritical CO2 10 Liter Extractor Design and Worldwide Rights: The Infinity Supercritical 10L CO2 extractor is for botanical oil extraction, which is rich in terpenes and can produce shelf ready full spectrum oil. With over 5 years of development, this industry leader mature extractor machine has been sold since 2015 and is part of many profitable businesses. The process can also be used for electrowinning, e-waste recycling, and lithium battery recycling, gold mining electronic wastes, precious metals. CO2 can also be used in a reverse fuel cell with nafion to make a gas-to-liquids fuel, such as methanol, ethanol and butanol or ethylene. Supercritical CO2 has also been used for treating nafion to make it more effective catalyst. This NFT is for the purchase of worldwide rights which includes the design. More Info
NFT (Non Fungible Token): Buy our tech, design, development or system NFT and become part of our tech NFT network... More Info
Infinity Turbine Products: Special for this month, any plans are $10,000 for complete Cad/Cam blueprints. License is for one build. Try before you buy a production license. May pay by Bitcoin or other Crypto. Products Page... More Info
CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com (Standard Web Page)