PDF Publication Title:
Text from PDF Page: 256
In preceding articles, we have used an organo-silylated nano-SiO2 as silicon source to synthesize mesoporous Beta zeolite with intracrystalline mesopores. In consideration of the essentiality for studying the adsorption and mass transport of molecules in the pores of nanoporous materials, where sorption and reaction sites are located, to understand catalytic and separation processes of organic molecules, in the present study, three xylene isomers were employed as probe molecules to explore the adsorption and diffusion behaviors of xylene isomers molecules on the mesoporous Beta zeolites by their adsorption isotherms and ZLC desorption curves. The impacts of mesopore in Beta zeolites on the adsorption and diffusion of xylene isomers with different molecular configuration will also be investigated. 2. ResultsandDiscussion 2.1. Characterization Figure 1 presents the X-ray powder diffraction (XRD) patterns of the four Beta zeolite samples. It is seen that the samples exhibit the diffraction peaks around 7.8[101] and 22.4[302], which are the characteristic peaks of BEA topology structure [1]. Compared to zeolite Beta-0, a slight decrease in the intensity of most peaks and broader reflections were observed for the mesoporous Beta zeolite samples. Nitrogen adsorption/desorption isotherms at 77 K on the four Beta zeolite samples and corresponding density functional theory (DFT) pore size distributions are displayed in Figure 2. Beta-0 sample exhibits a typical type I isotherm according to the International Union of Pure and Applied Chemistry (IUPAC) classification [23], reflecting solely microporous structure. However, the Beta-1, -2, -3 samples represent a steep uptake caused by the micropores filled at the low relative pressure region of p/p0 < 0.01, followed by the gradual and continual rising curves and the hysteresis loops, indicating distinctly the presence of both micropores and mesopores. The pore sizes of the three mesoporous Beta zeolite samples mainly center in the range of 2–6 nm from the DFT pore size distribution curves. Table 1 listed the pore structural parameters of four Beta zeolite samples based on N2 adsorption/desorption isotherms. Mesoporous Beta-1, Beta-2, and Beta-3 possess an increasing sequence for mesopore volumes and external surface areas. Further, the typical scanning electron microscopy (SEM) and transmission electron microscope (TEM) images of the mesoporous Beta-3 zeolite sample are displayed in Figure 3. It is seen that the zeolite consists of particles with dimensions in the range of 400–600 nm made up of nanocrystals with sizes smaller than 100 nm. These images also show mesoporous voids between the primary particles. Moreover, as showed in the TEM images, intracrystalline mesopores and lattice fringes of zeolite crystalline are well resolved in large scale through the zeolite particles, indicating 241PDF 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 | RSS | AMP |