Characterization and Catalytic Properties of Ni3Al for Hydrogen Production from Methanol

2004 ◽  
Vol 842 ◽  
Author(s):  
Ya Xu ◽  
Satoshi Kameoka ◽  
Kyosuke Kishida ◽  
Masahiko Demura ◽  
An-pang Tsai ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Surface Area ◽  
Inductively Coupled Plasma ◽  
Surface Characterization ◽  
High Selectivity ◽  
Methanol Decomposition ◽  
Area Measurement ◽  
Life Test ◽  
Inductively Coupled ◽  
Powder Samples

ABSTRACTThe stability of catalytic activity and selectivity of Ni3Al for methanol decomposition were studied by life test at 633 K on the alkali-leached powder samples. The characterization of the samples was carried out by X-ray diffraction, inductively coupled plasma (ICP) analysis, SEM observation, and surface area measurement. The life test showed that the alkali-leached Ni3Al exhibits a very stable activity and a high selectivity for methanol decomposition. The surface characterization after reaction suggests that the high selectivity and stable activity may be attributed to the formation of tiny particles and porous structure which increased the surface area significantly during reaction. These results indicate a possibility of Ni3Al as a catalyst for hydrogen production reaction.

Surface Characterization of W/Ni/Al2O3 Catalysts

1997 ◽  
Vol 497 ◽  
Author(s):  
M. H. Jordão ◽  
J. M. Assaf ◽  
P. A. P. Nascente
Keyword(s):  
Photoelectron Spectroscopy ◽  
Inductively Coupled Plasma ◽  
Surface Characterization ◽  
Nickel Content ◽  
Stable Phase ◽  
Preparation Methods ◽  
X Ray ◽  
Inductively Coupled ◽  
Temperature Programmed ◽  
Two Phases

ABSTRACTCatalysts containing tungsten and nickel oxides are important in hydrodesulfurization (HDS), hydrogénation (HY), and steam reforming of hydrocarbons. A series of W/Ni/Al2O3 catalysts was prepared by two different methods: (1) coprecipitation of nickel and aluminium hydroxicarbonate from their nitrates, followed by calcination and impregnation of tungsten; (2) precipitation of boehmite from aluminium nitrate, followed by impregnations of nickel, firstly, and tungsten. The nickel content was kept constant, while the amount of tungsten varied from 2.5 to 15.5 wt-%. The resulting oxides were characterized by inductively coupled plasma spectroscopy (ICP), atomic absorption spectroscopy (AAS), X-ray diffraction (XRD), temperature programmed reduction (TPR), and X-ray photoelectron spectroscopy (XPS). ICP and AAS were used to determine the W, Ni, and Al concentrations. XRD detected two phases: NiO and NiAl2O4 (no phase containing metallic tungsten was detected). Increasing the amount of W, the quantity of NiAl2O4 rose, the quantity of NiO decreased, and the particle size of NiO enlarged. The TPR profiles presented three peaks: one at about 1000 °C, associated to a very stable phase; for the samples prepared by coprecipitation, the other two peaks corresponded to “free NiO” and a nonstoichiometric aluminate. For the samples prepared by impregnation, those peaks corresponded to NiO and NiAl2O4. XPS identified Al2O3, NiAl2O4, and Al2(WO4)3 for both preparation methods. Increasing the amount of tungsten in the impregnated samples, NiWO4 was also observed.

scholarly journals Phase diagram prediction and particle characterization of Sn-Ag nano alloy for low melting point lead-free solders

2012 ◽  
Vol 48 (3) ◽  
pp. 419-425 ◽  
Author(s):  
J. Sopousek ◽  
J. Vrestal ◽  
A. Zemanova ◽  
J. Bursi
Keyword(s):  
Phase Diagram ◽  
Melting Point ◽  
Inductively Coupled Plasma ◽  
Fine Powder ◽  
Melting Point Depression ◽  
Electron Microscopic ◽  
Inductively Coupled ◽  
Size Dependent ◽  
Powder Samples ◽  
Wet Synthesis

SnAg nanoparticles (SnAg NPs) were prepared by wet synthesis. The chemical composition of the SnAg NPs was obtained by inductively coupled plasma - mass spectrometry. The prepared fine powder samples were characterized by electron microscopic technique (SEM) and thermal analysis (DSC). The nanoparticles with different size were obtained. The size dependent melting point depression (MPD) of the SnAg NPs was determined experimentally. The size dependent phase diagram of the SnAg alloy was also calculated using CALPHAD method, which has been extended to describe the surface energy of SnAg nanoparticles. The same approach was used for SnAg eutectic MPD calculations. The own experimental and theoretical results were compared with the data of the other authors. The satisfactory agreement was found.

Changing the morphology of one-dimensional titanate nanostructures affects its tissue distribution and toxicity

2020 ◽  
Vol 36 (4) ◽  
pp. 272-286
Author(s):  
Nahla Kamal ◽  
AH Zaki ◽  
Ahmed AG El-Shahawy ◽  
Ossama M Sayed ◽  
SI El-Dek
Keyword(s):  
Tissue Distribution ◽  
Surface Area ◽  
Inductively Coupled Plasma ◽  
Histopathological Analysis ◽  
X Ray Diffraction ◽  
One Dimensional ◽  
Inductively Coupled ◽  
Transmission Electron ◽  
Titanate Nanostructures ◽  
The Impact

The present research investigated the impact of the morphology change of titanate (TiO2) nanostructures on its tissue distribution and toxicity. The TiO2 nanotubes, rods, and ribbons were synthesized by the hydrothermal technique, and the morphology was adjusted by alteration of the hydrothermal duration time. The characterization techniques were X-ray diffraction, high-resolution transmission electron microscopy, dynamic light scattering, and the Brunauer–Emmett–Teller method for measuring the surface area. The intravenously administrated dose (5 mg/kg) was injected as a single dose for 1 day and consecutively for 42 days. The quantitative analysis of accumulated TiO2 nanostructures in the liver, spleen, and the heart was performed using an inductively coupled plasma emission spectrometer, and the organs’ toxicity was estimated by histopathological analysis. The prepared nanostructures exhibited differences in morphology, crystallinity, size distribution, surface area, zeta potential, and aspect ratio. The results revealed a tissue distribution difference between the liver, spleen, and heart of these nanostructures, the distribution order was the liver, spleen, and the heart for all TiO2 nanostructures. The toxicity was induced with different degrees. The nanotubes were the most harmful among the three formats. In summary, changes in the morphology of the TiO2 nanostructures change its distribution and toxicity.

Surface characterization of inductively coupled plasma etched SiC in SF6/O2

2003 ◽  
Vol 67-68 ◽  
pp. 369-375 ◽  
Author(s):  
Liudi Jiang ◽  
N.O.V. Plank ◽  
R. Cheung ◽  
R. Brown ◽  
A. Mount
Keyword(s):  
Inductively Coupled Plasma ◽  
Surface Characterization ◽  
Inductively Coupled

scholarly journals Improvement of the quality of analytical control of metallurgical products as a means of uncertainty

2020 ◽  
Vol 130 (1) ◽  
pp. 11-17
Author(s):  
R.A. Aubakirova ◽  
◽  
E.N. Ivashchenko ◽  
B.S. Saurbaeva ◽  
G.K. Daumova ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
High Selectivity ◽  
Atomic Emission ◽  
Analytical Control ◽  
Inductively Coupled ◽  
Atomic Spectral Analysis ◽  
Physical And Chemical ◽  
Instrumental Methods ◽  
Analytical Laboratories

The entire technological process, starting from ore mining to ending with the release of finished products, it is closely connected with the analytical control of each stage. Currently, the practice of analytical laboratories of large metallurgical enterprises, which include the Oskemen Metallurgical Complex LLP "Kazzinc", has firmly entered the physical and chemical or instrumental methods. These methods, which are characterized by rapidity, high selectivity and the ability to simultaneously determine several components, have replaced in most cases chemical ones. The article presents experimental data on the analysis of dump slag - the waste from metallurgical production of the Oskemen Metallurgical Complex LLP "Kazzinc"- by atomic emission method with inductively coupled plasma. Atomic spectral analysis are used in mining and geology, metallurgy, metalworking and chemical industries, etc. The analysis results were processed from the standpoint of the concept of uncertainty, which is very relevant in the practice of the analytical laboratory.

scholarly journals Adsorpsi Logam Timbal Secara Batch dan Kontinu Menggunakan Karbon Aktif dari Cangkang Kelapa Sawit

2019 ◽  
Vol 4 (2) ◽  
pp. 267
Author(s):  
Chairul Irawan ◽  
Anisa Purwanti ◽  
Norhasanah Norhasanah
Keyword(s):  
Surface Area ◽  
Inductively Coupled Plasma ◽  
Emission Spectroscopy ◽  
Optical Emission Spectroscopy ◽  
Optical Emission ◽  
Icp Oes ◽  
Inductively Coupled ◽  
Plasma Optical Emission Spectroscopy

Pada proses produksi industri kain Sasirangan, proses pewarnaan menghasilkan limbah cair berupa logam berat timbal (Pb). Penelitian ini bertujuan untuk mengetahui waktu kesetimbangan, dan efisiensi penurunan konsentrasi logam Pb pada limbah cair Sasirangan dengan proses batch dan kontinu ditinjau dari waktu kontak, dosis adsorben dan ukuran adsorben cangkang kelapa sawit. Proses karbonisasi berlangsung selama 4 jam pada suhu 105oC. Cangkang kelapa sawit yang digunakan sebagai adsorben diaktivasi menggunakan kalium hidroksida (KOH) 25% (b/v) selama 24 jam dengan variasi ukuran 355 µm dan 710 µm. Proses adsorpsi dilakukan dengan konsentrasi awal Pb sebesar 151 mg/L, pH 5, kecepatan pengadukan 200 rpm, dan suhu kamar pada variasi waktu tertentu.  Analisa yang dilakukan yaitu Brunauer-Emmett-Teller (BET) untuk mengetahui luas permukaan adsorben dan Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES) untuk mengetahui kadar logam di dalam limbah setelah dilakukannya proses adsorpsi. Hasil penelitian menunjukkan bahwa surface area berdasarkan analisa BET adsorben dari cangkang kelapa sawit sebelum dan setelah aktivasi sebesar 10,125 m2/gram dan 16,314 m2/gram. Eksperimental proses adsorpsi secara batch menunjukkan bahwa adsorben cangkang kelapa sawit efektif dalam mengadsorpsi kandungan logam Pb dengan waktu kesetimbangan 24 jam, dosis optimum 2,5 g/L, dan ukuran adsorben 355 µm dengan penurunan konsentrasi dan kadar Pbteradsorb 1,41 mg/L dan 98,47 %. Efisiensi penurunan kandungan logam Pb pada proses adsorpsi batch sebesar 99,07 %, sedangkan dengan proses adsorpsi secara kontinu sebesar 95,23 %.

scholarly journals Synthesis, characterization and catalytic activity of partially substituted La1−xBaxCoO3 (x ≥ 0.1 ≤ 0.4) nano catalysts for potential soot oxidation in diesel particulate filters in diesel engines

2020 ◽  
Vol 11 (1) ◽  
pp. 52-57
Author(s):  
Kayode Akinlolu ◽  
Bamgboye Omolara ◽  
Tripathi Shailendra ◽  
Akinsiku Abimbola ◽  
Ogunniran Kehinde
Keyword(s):  
Surface Area ◽  
Inductively Coupled Plasma ◽  
Research Study ◽  
Sol Gel ◽  
Soot Oxidation ◽  
Atomic Emission ◽  
Catalytic Performance ◽  
Inductively Coupled ◽  
Perovskite Catalysts ◽  
Nano Catalysts

AbstractThe sol gel method was used in preparing a series of A site partially substituted La1−xBaxCoO3 (x ≥ 0.1 ≤ 0.4) perovskite catalysts coded LBC1, 2, 3, and 4 and their potential as catalysts for soot oxidation were evaluated. The Brunauer–Emmett–Teller (BET), Inductively Coupled Plasma Atomic Emission Spectroscopy (ICPAES), Thermogravimetric/Differential Thermal Analysis (TGA/DTG), X-ray analysis (XRD) were used in characterizing the prepared perovskite catalyst. The result shows that at (x≥ 0.2 ≤ 0.4), there was an increase in surface area when we compare it with that of x = 0. The increase in surface area helps in increasing the catalytic performance of the catalyst. Also, when evaluating the catalytic performance of the synthesized catalysts, it was observed that doping the perovskite catalysts helped in the general improvement of the catalytic performance for soot oxidation. The best performance in this research study with a T50 of 484 °C was observed at x = 0.2 catalyst (LBC2). This shows that the non-noble perovskite catalysts prepared in this research study has the potential to replace the noble metal based catalysts used presently in the diesel automotive industry.

scholarly journals Okra (Abelmoschus esculentus) in a refugee context in East Africa: Kitchen gardening helps with mineral provision

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Desta Woldetsadik ◽  
Eulogio J. Llorent-Martínez ◽  
Solomie Gebrezgabher ◽  
Mary Njenga ◽  
Ruth Mendum ◽  
...  
Keyword(s):  
Young Children ◽  
East Africa ◽  
Inductively Coupled Plasma ◽  
Geographic Origin ◽  
Refugee Camps ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Powder Samples ◽  
Plasma Mass Spectrometry ◽  
Nutrition Sensitive

AbstractKitchen gardening is considered a way to reconnect with agriculture and complement the cereal-based relief food offered to refugees in East Africa. This work aimed at profiling mineral content of okra in four refugee camps and settlements located in Ethiopia and Uganda and its contribution to adequate intake (AIs) or recommended dietary allowances (RDAs) for young children and pregnant and lactating women (PLW). The study also evaluated the applicability of portable X-ray fluorescence (PXRF) as compared with inductively coupled plasma mass spectrometry (ICP-MS) for mineral profiling of okra powder samples. The contents of minerals (mg kg−1) from the ICP-MS readings were in the following ranges: K (14,385–33,294), Ca (2610–14,090), P (3178–13,248), Mg (3896–7986), Cu (3.81–19.3), Fe (75.7–1243), Zn (33–141) and Mn (23.1–261). Regardless of geographic origin, at low-end consumption probability (17 g day−1 for young children and 68 g day−1 for PLW), okra could contribute ˂ 15% (2.7–12.9%) AI for macro-minerals (K and Ca). In addition, the contributions to RDA values for Fe and Zn, elements of known public health interest, ranged from 4.5 to 34.7% for young children. Interestingly, regression lines revealed strong agreement between ICP-MS and PXRF readings for Mn and Zn, with R2 values > 0.91. This information is useful in support of nutrition-sensitive kitchen gardening programs through scaling culturally important crops in refugee settings.

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