scholarly journals Synthesis and Characterization of ZSM-5 Catalyst at Different Temperatures

2017 ◽  
Vol 214 ◽  
pp. 012032 ◽  
Author(s):  
W Widayat ◽  
A N Annisa
Keyword(s):  
Synthesis And Characterization ◽  
Different Temperatures

Synthesis and Characterization of Nanocrystalline ZnO Powders by a Direct Thermal Decomposition Route Using Zinc Nitrate Hexahydrate

2013 ◽  
Vol 770 ◽  
pp. 68-71 ◽  
Author(s):  
Supphadate Sujinnapram ◽  
Uraiphorn Termsuk ◽  
Atcharawan Charoentam ◽  
Sutthipoj Sutthana
Keyword(s):  
Thermal Decomposition ◽  
Crystallization Temperature ◽  
Zinc Nitrate ◽  
Zinc Nitrate Hexahydrate ◽  
Absorption Peak ◽  
Synthesis And Characterization ◽  
Nitrate Hexahydrate ◽  
Different Temperatures ◽  
Zno Powders

The nanocrystalline ZnO powders were synthesized by a direct thermal decomposition using zinc nitrate hexahydrate as starting materials. The precursor was characterized by TG-DTA to determine the thermal decomposition and crystallization temperature which was found to be at 325 oC. The precursors were calcined at different temperatures of 400, 500, and 600°C for 4 h. The structure of the prepared samples was studied by XRD, confirming the formation of wurtzite structure. The synthesized powders exhibited the UV absorption below 400 nm (3.10 eV) with a well defined absorption peak at around 285 nm (4.35 eV). The estimated direct bandgaps were obtained to be 3.19, 3.16, and 3.14 eV for the ZnO samples thermally decomposed at 400, 500, and 600°C, respectively.

scholarly journals Synthesis and Characterization of New Solketal Alkylesters Usable as Diesel Biobased Fuel Additives

2019 ◽  
Vol 70 (4) ◽  
pp. 1167-1172 ◽  
Author(s):  
Constantin Neamtu ◽  
Emil Stepan ◽  
Valentin Plesu ◽  
Grigore Bozga ◽  
Alexandru Tuluc
Keyword(s):  
Water Solubility ◽  
Methyl Esters ◽  
Experimental Studies ◽  
Synthesis And Characterization ◽  
Antoine Equation ◽  
Vapor Equilibrium ◽  
Different Temperatures ◽  
Biodiesel Fuels ◽  
New Compounds

There are described experimental studies on the esterification of solketal, (the cyclic acetal produced from glycerol and acetone reaction), by transesterification reactions of the -OH group with methyl esters of C3 -C10aliphatic acids (propionic, pentanoic, hexanoic, octanoic and decanoic). The goal was to obtain better additives for diesel and biodiesel fuels, as compared to solketal. The measured physical properties (especially density, viscosity and water solubility) of the synthesized solketal esters, closer to the corresponding ones for the diesel and biodiesel fuels, permit to suppose that these new compounds should be better additives for diesel type fuels, as compared with solketal. For three of these esters there were studied the liquid-vapor equilibrium at different temperatures, determining also the Antoine equation coefficients for the calculation of vapor pressure.

Synthesis and Characterization of CuInS2 and CuInSe2 Compounds by Vacuum Sintering Method

2011 ◽  
Vol 304 ◽  
pp. 119-123
Author(s):  
Zhen Dong Wang ◽  
Zhen Quan Lai ◽  
Guo Rong Chen
Keyword(s):  
Milled Powder ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
Vacuum Sintering ◽  
Raman Scattering Spectroscopy ◽  
Copper Indium ◽  
Structure Morphology ◽  
Different Temperatures ◽  
Sintering Method

We report herein synthesis and characterization of CuInS2and CuInSe2compounds by vacuum sintering method. In this study, the manual-milled and ball-milled precursors including copper, indium, and sulfur (selenium) elements were sintered under vacuum at different temperatures for synthesis of CuInS2and CuInSe2compounds, respectively. The crystal structure, morphology and Raman property of the sintered powder were investigated by X-ray diffraction, scanning electron microscope and Raman scattering spectroscopy, respectively. The results show that the structure of the products, which was sintered with the manual-milled and ball-milled precursors, were transformed into the single chalcopyrite phase CuInS2powder at 923K and 623K, and the grain size are about 2～3μm and 250 nm, respectively. In addition, the CuInSe2 powder was synthesized about 723K via using the ball-milled powder including copper, indium, and selenium elements as the precursor.

SYNTHESIS AND CHARACTERIZATION OF Au/ZnO NANOCOMPOSITES

2001 ◽  
Vol 15 (17n19) ◽  
pp. 679-682 ◽  
Author(s):  
U. PAL ◽  
E. AGUILA ◽  
O. VAZQUEZ ◽  
N. KOSHIZAKI ◽  
T. SASAKI ◽  
...  
Keyword(s):  
Au Nanoparticles ◽  
Annealing Temperature ◽  
Composite Films ◽  
Synthesis And Characterization ◽  
Subsequent Change ◽  
Nanocomposite Thin Films ◽  
Different Temperatures ◽  
Average Size ◽  
Gold Wires

Au/ZnO nanocomposite thin films were prepared by co-sputtering of ZnO and gold. The Au content in the films was varied by varying the length of gold wires on the ZnO target. Depending upon the Au content in the films, the Au nanoparticles of different average size values were formed in the ZnO matrix. The composite films were annealed at different temperatures to study the evolution of Au particles and the subsequent change in their optical properties. With the increase of Au content in the films, the size of the nanometric Au particles decreased but increased with the increase of annealing temperature.

scholarly journals Tri-doped Co-annealed Zinc Oxide Semi-conductor Synthesis and Characterization - Photodegradation of Dyes and Gas sensing Applications

2021 ◽  
Author(s):  
Manik Rakhra ◽  
Neha Verma
Keyword(s):  
Zno Nanoparticles ◽  
Gas Sensing ◽  
Combustion Method ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
Fast Reaction ◽  
Nitrogen Gas ◽  
Sensing Applications ◽  
Different Temperatures

Abstract Despite the fact that much of the research has been performed on ZnO-based nanoparticles but still a lot of unexplored The synthesis and characterization of the ZnO Nano rinds, which have been co-created using a simple combustion method, are documented here and are prepared with its sensor and photocatalytic degradations. In, Sn and SB specific quantity was used as dopants, while their effects were co-annealed on glass substrate at different temperatures, i.e. 1.0 percent and 1.5 percent at 5000C, 11000. At varying temperatures, the samples were coated on to the chosen substrate using doctor blade technique. Crystallite scale was measured to the range of 30-50 nm. At such temperatures the grain size measured for the samples was in range of 50-70 nm. This showed that the prepared Nano rods are well crystalline and have strong optical properties to handle. Studies of X ray diffraction showed the influential point (101). These coated samples designed for nitrogen gas sensing have been tested for the development of smart and functional instruments. Furthermore it was observed that the samples prepared at higher temperatures exhibit better recovery and better reaction time. Valance ion process explains the gas sensors fast reaction and long recovery time. Thus prepared ZnO nanoparticles are have photocattalytic degredation (99.86%) only in 55 min. We observed optimum exposure at an operating temperature of 1050C. It is notable that morphology of susceptible layer nanoparticles is preserved based on different tri-doping concentrations. The concentration of T2-ZnO nanoparticles for photodegradation of the DR-31 dye and NO2 gas sensing applications were 1.0 at.wt%

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