scholarly journals Nickel-based catalysts: Dependence of properties on nickel loading and modification with palladium

2016 ◽  
Vol 70 (2) ◽  
pp. 137-142 ◽  
Author(s):  
Vesna Nikolic ◽  
Zeljko Kamberovic ◽  
Marija Korac ◽  
Zoran Andjic ◽  
Aleksandar Mihajlovic ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Comparative Analysis ◽  
Chemical Analysis ◽  
Energy Dispersive Spectroscopy ◽  
Hydrogen Reduction ◽  
Energy Dispersive ◽  
Complete Reduction ◽  
Scanning Electron

The aim of this study was comparative analysis of catalysts with 5 and 20 wt. % Ni loading, with and without Pd additive, and it included: determination of reduction degrees, investigation on microstructure by scanning electron microscopy and chemical analysis by energy-dispersive spectroscopy. Ni/Al2O3 and Ni-Pd/Al2O3 catalysts supported on ?-Al2O3-based foams were synthesized by aerosol assisted impregnation. Impregnation of the foams by ultrasonically aerosolized chlorides was followed by drying at 473 K and hydrogen reduction at 533 and 633 K. Lower Ni loading resulted in higher reduction degrees. Ni loading of 20 wt. % enabled relatively uniform coverage of the foam with a metallic coating. With activity modifier (Pd), nearly complete reduction was achieved at both temperatures. Reduction degrees reached 99.4 and 98.2 wt. % at 533 K for 5 and 20 wt. % of Ni, respectively.

Pengaruh implantasi ion tin (Titanium Nitrida) terhadap sifat mekanis baja VCL 140

2010 ◽  
Vol 8 (1) ◽  
pp. 753
Author(s):  
Muhammad Muhammad
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Energy Dispersive Spectroscopy ◽  
Energy Dispersive ◽  
Scanning Electron

Implantasi ion dapat meningkatkan sifat mekanik seperti kekerasan bahan yang akan digunakan untuk komponen dan peralatan proses manufaktur. Implantasi ion dipengaruhi oleh jenis ion dopan, waktu dan energi yang digunakan. Penelitian ini dilakukan untuk mengetahui pengaruh energi dan waktu implantasi ion titanium nitrida terhadap kekerasan dan struktur mikro pada baja VCL 140. Implantasi dilakukan pada arus berkas tetap 10 yA. Variasi waktu 60, 70, 80, 90, 100, 110, 120 menit, energi 75 keV dan variasi energi 15, 30, 45, 60, 75, 90 dan 100 keV dengan waktu implantasi 100 menit dilakukan untuk mendapatkan kekerasan optimum. Uji Kekerasan menggunakan metode Vickers dengan beban 10 gram dan waktu 10 detik. Topografi dari lapisan TIN diamati menggunakan scanning electron microscopy (SEM) dan komposisi kimia dari lapisan TIN dianalisa menggunakan energy dispersive spectroscopy (EDS).Kata kunci : Implantasi ion, VCL 140, kekerasan

scholarly journals Use of Scanning Electron Microscopy and Energy-Dispersive Spectroscopy to Correlate the Arrangement of Starch with Resistance to Maize Weevil (Coleoptera: Curculionidae) in Sorghum Grain

2011 ◽  
Vol 17 (S2) ◽  
pp. 250-251
Author(s):  
M Pendleton ◽  
B Pendleton ◽  
E Ellis ◽  
G Peterson ◽  
F Chito ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Energy Dispersive Spectroscopy ◽  
Energy Dispersive ◽  
Maize Weevil ◽  
Sorghum Grain ◽  
Scanning Electron

Extended abstract of a paper presented at Microscopy and Microanalysis 2011 in Nashville, Tennessee, USA, August 7–August 11, 2011.

Crystalline Phases During the Melting of Bi2Sr2CaCu2OX

1991 ◽  
Vol 249 ◽  
Author(s):  
Ming Xu ◽  
J. Polonka ◽  
A. I. Goldman ◽  
D. K. Finnemore ◽  
Qiang Li ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
High Temperature ◽  
Energy Dispersive Spectroscopy ◽  
Energy Dispersive ◽  
Crystalline Phases ◽  
Fast Cooling ◽  
Crystallization From The Melt ◽  
Scanning Electron

ABSTRACTThe melting of Bi2Sr2CaCu2Ox material has been studied by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) in order to study the phases that formed in the high temperature regions. Two distinct phases of (Sr1-xCax)CuO2 and (Sr1-xCax)2CuO3 have been observed in the Bi-rich matrix depending upon quenching temperatures. Crystallization from the melt by fast cooling usually produce the co-existence of Bi (2201) and these Sr-Ca-Cu-O phases.

Coal Combustion Fly Ash Characterization: Electron Spectroscopy for Chemical Analysis, Energy Dispersive X-ray Analysis, and Scanning Electron Microscopy

1980 ◽  
Vol 34 (5) ◽  
pp. 549-555 ◽  
Author(s):  
S. J. Rothenberg ◽  
P. Denee ◽  
P. Holloway
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fly Ash ◽  
Chemical Analysis ◽  
Electron Spectroscopy ◽  
Energy Dispersive ◽  
Compositional Variation ◽  
X Ray ◽  
Calcium Iron ◽  
Scanning Electron

The surface and bulk properties of five samples of fly ash have been examined by electron spectroscopy for chemical analysis (ESCA), scanning electron microscopy (SEM) and energy dispersive x-ray analysis (EDXA). Samples from a conventional pulverized coal combustor, a conventional stoker-fed combustor, and an experimental fluidized bed combustor (FBC) were examined. ESCA data indicated that all samples contained silicon, aluminum, magnesium, calcium, iron, potassium, carbon, oxygen, and sulfur and all but one contained titanium. Samples from the conventional combustors contained more carbon than samples from the FBC. FBC samples contained large amounts of calcium and magnesium. Valence states of some elements were obtained by a detailed examination of selected ESCA peaks. Sputtering was performed on two samples to obtain a depth profile of the composition. The EDXA data confirmed the presence of silicon, aluminum, magnesium, calcium, iron, potassium, sulfur, and titanium while chlorine was detected in some samples. The EDXA data for individual particles exhibited marked particle to particle compositional variation. SEM studies demonstrated that the morphology of FBC samples was different from that of all of the conventional combustor samples examined.

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