Synthesis and Characterization of ZSM-5 Zeolite Using Kaolin as Si and Al Source

2014 ◽  
Vol 805 ◽  
pp. 651-656 ◽  
Author(s):  
Valmir José da Silva ◽  
Meiry Glaúcia Freire Rodrigues
Keyword(s):  
Hydrothermal Treatment ◽  
Crystalline Material ◽  
Synthesis And Characterization ◽  
Mass Ratio ◽  
Alternative Source ◽  
Shape Characteristic ◽  
Autogenous Pressure ◽  
Calcined Kaolin

The objective of this work is to obtain synthesis of ZSM-5 zeolite using kaolin as Si and Al alternative source. Kaolin powder was dispersed under constant stirring into the sílica sol where the mass ratio of kaolin to silica was 1:2. After stirring for 2 hours, the dispersion was dried at 160 °C and calcined at 700 °C/2 hours. The synthesis of ZSM-5 zeolite was by hydrothermal treatment at 170 °C/48 hours under autogenous pressure. The materials were characterized by XRD, SEM, EDX, BET. According to the XRD, was possible to observe the formation of ZSM-5 zeolite with intense and well defined peaks set located between 2θ = 7-9° and 23-25°, typical of a crystalline material. The SEM showed the formation of particles clusters with orthorhombic shape characteristic of MFI structure. The results show that the hydrothermal treatment was efficient to produce ZSM-5 using calcined kaolin as alternative source.

scholarly journals Synthesis and Characterization of Mesoporous NaX Zeolite from Kaolin Loading of Soursop Leaves Extract (Annona muricata Linn.)

ALCHEMY ◽  
2018 ◽  
Vol 5 (3) ◽  
pp. 100
Author(s):  
Ilmin Nasifah ◽  
Susi Nurul Khalifah ◽  
Elok Kamilah Hayati
Keyword(s):  
Hydrothermal Method ◽  
Ethanol Extract ◽  
Nitrogen Adsorption ◽  
Synthesis And Characterization ◽  
Annona Muricata ◽  
Nax Zeolite ◽  
Loading Process ◽  
Uniform Particles ◽  
Calcined Kaolin

<p>Mesoporous NaX zeolite has been synthesized from calcined kaolin with the addition of 5M NaOH and CTABr surfactant as mesoporous template by hydrothermal method. The result of synthesis was used as anticancer loading agent of ethanol extract soursop leaves. Characteristics of zeolite were studied by XRD, IR spestroscopy, Nitrogen Adsorption and SEManalysis. The mesoporous NaX zeolite has been formed with mixing of A, Y, kaolinite and quartz phases. The surface of zeolite particles has changed from amorphous to regular and uniform particles. The pores of NaX zeolite belongs to mesoporous type with size 6.13 nm. Loading process of soursop leaves extract on zeolite decreased intensity and crystallinity of zeolite peaks. The new absorption in soursop leaves extract loaded on zeolite spectra was detected at 2928.174 cm<sup>-1</sup>. The surface of zeolite seen to be compact and irregular.</p>

Synthesis and characterization of a novel wound dressing by PVP/ PAANa/chitosan with semi-interpenetrating polymer network structure

e-Polymers ◽  
2012 ◽  
Vol 12 (1) ◽  
Author(s):  
Ying Wu ◽  
Qing Yang ◽  
Yali Gi ◽  
Yueting Zhang
Keyword(s):  
Network Structure ◽  
Wound Dressing ◽  
Polymer Network ◽  
Interpenetrating Polymer Network ◽  
Wound Dressings ◽  
Synthesis And Characterization ◽  
Cross Linking ◽  
Mass Ratio ◽  
Scanning Electron

AbstractA novel hydrogel wound dressing with semi-interpenetrating polymer network structure (semi-IPN) was prepared by radical polymerization of acrylic acid with potassium persulfate (K2S2O8) as initiator and N, N'-methylenebisacrylamide (MBA) as cross-linking agent in the presence of chitosan (CTS) and polyvinyl pyrrolidone (PVP). Hydrogels were characterized by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). SEM displayed semi- IPN hydrogels' creased surface with some scale-like wrinkles, thus improving the absorptive capability which has been considered as a most important characteristic of wound dressings. It was found that the content of cross-linking agent and the mass ratio of PVP and CTS had much influence on the mechanical properties of the hydrogel, varying from brittle plastics to elastomer due to the different degrees of cross linking. Since tensile strength is partly in inverse ratio to the hydrogel absorbent capability, the article offers an analysis of varying material proportion in order to obtain an optimum properties of the hydrogel wound dressing .

SBA-15 Molecular Sieve Using Clay as Silicon Sources

2014 ◽  
Vol 798-799 ◽  
pp. 116-120 ◽  
Author(s):  
Gustavo Medeiros de Paula ◽  
L.A. Lima ◽  
Meiry Glaúcia Freire Rodrigues
Keyword(s):  
Surface Area ◽  
Great Reduction ◽  
Molecular Sieve ◽  
Total Pore Volume ◽  
Synthesis And Characterization ◽  
Alternative Source ◽  
Research Teams ◽  
Silica Source ◽  
Silicon Sources

New sources of silica as a replacement for TEOS in the synthesis of SBA-15 are been performed by various research teams worldwide. The aim of this work is to describe the synthesis and characterization of SBA-15 made with chocolate B clay as an alternative source of silica by the hydrothermal method. Samples of classic SBA-15 were made with the traditional TEOS method. The samples of the two silica sources were characterized by DRX, EDX, and BET to evaluate the effects of the silica source on the synthesis of the molecular sieve. The chocolate B clay was efficient in the formation of the molecular sieve structure, but there was a great reduction in the surface area and total pore volume in comparison to the surface area of classic SBA-15.

One-step synthesis and characterization of ZrO2–WOxprepared by hydrothermal method at autogenous pressure

2003 ◽  
Vol 13 (1) ◽  
pp. 143-149 ◽  
Author(s):  
H. Armendáriz ◽  
M. A. Cortes ◽  
I. Hernández ◽  
J. Navarrete ◽  
A. Vázquez
Keyword(s):  
Hydrothermal Method ◽  
Synthesis And Characterization ◽  
One Step ◽  
Autogenous Pressure

scholarly journals Synthesis and characterization of the starch/silicone composite and elaboration of its films

2021 ◽  
Author(s):  
Coyolicaltzin Peralta-González ◽  
Aurelio Ramirez-Hernandez ◽  
Gustavo Rangel-Porras ◽  
Alejandro Aparicio-Saguilán ◽  
Andrés Aguirre-Cruz ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Composite Films ◽  
Sem Analysis ◽  
Synthesis And Characterization ◽  
Starch Granules ◽  
Mass Ratio ◽  
Synthesis Conditions ◽  
Packaging Industry ◽  
Potential Use

Abstract Synthesis of the starch/silicone composite carried out and its structural characterization by FTIR, Raman and 29Si NMR allowed to identify functional groups of the composite. The synthesis conditions were a starch/silicone mass ratio of 2.0 and a temperature of 150 oC to obtain a yield of 84.63 %. SEM analysis showed that the starch granules were covered by silicone, this caused a decrease in the crystallinity of starch. Composite films have higher thermal stability compared to native starch. Mechanical properties and electrical conductivity of the starch/silicone composite film increase with respect to starch-only films. While the crystallinity of both films is similar. The results obtained in this work indicate that starch/silicone composites can be an alternative to make films with a potential use for the packaging industry.

Synthesis and Characterization of Silver(I) and Gold(I) Complexes Bearing a Pyrido-annelated N-Heterocyclic Carbene: A Rare Example of a Cocrystal Containing Two Different Gold(I) Complexes

2014 ◽  
Vol 69 (11-12) ◽  
pp. 1188-1198 ◽  
Author(s):  
Margit Kriechbaum ◽  
Daniela Otte ◽  
Manuela List ◽  
Uwe Monkowius
Keyword(s):  
Mass Spectrometry ◽  
Nmr Spectroscopy ◽  
Aromatic Compound ◽  
Elemental Analysis ◽  
Room Temperature ◽  
Electronic Spectroscopy ◽  
Crystalline Material ◽  
Synthesis And Characterization ◽  
Aurophilic Interactions

Abstract The cyclohexyl-substituted imidazo[1,5-a]pyridin-2-ium hexafluorophosphate, 2a, has been prepared as precursor for the respective pyrido-annelated N-heterocyclic carbene. [(NHC)2Ag]PF6, 3, has been synthesized by the reaction of 2a with AgCl=KOH in dichloromethane (DCM). Unexpectedly, the reaction of 3 with (tht)AuBr yielded both (NHC)AuBr and [(NHC)Au(tht)]PF6 which formed a 1 : 1 cocrystal (4a,b). The complexes are aggregated to infinite chains, which are governed by both π-π stacking and weak aurophilic interactions. Subsequent oxidation of the co-crystalline material with CsBr3 gave (NHC)AuBr3, 5. All compounds were characterized by NMR spectroscopy, mass spectrometry and elemental analysis. Additionally, compounds 2a and 5 were investigated by electronic spectroscopy: 2a behaves like a typical aromatic compound exhibiting absorption and fluorescence bands attributable to π-π* transitions. The Au(III) complex 5 exhibits ligand-centered fluorescence at room temperature and both ligand-centered fluorescence and a weak phosphorescence at 77 K.

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