Synthesis and Characterization of High Purity Ruthenium Sponge

2016 ◽  
Vol 850 ◽  
pp. 489-493
Author(s):  
Wei Yi ◽  
Ze Na Xin ◽  
Yue Sheng ◽  
Zhi Long Tan ◽  
Jun Min Zhang ◽  
...  
Keyword(s):  
High Purity ◽  
Electrode Materials ◽  
Reduction Method ◽  
Hydrogen Reduction ◽  
Refining Process ◽  
Synthesis And Characterization ◽  
Chemical Refining ◽  
Powder Density ◽  
Average Size

Ruthenium is widely used as catalyst, magnetic recording and electrode materials. In this study, high-purity (≥99.995 wt%) ruthenium sponge was synthesized from crude ruthenium (≤99.9 wt%) by chemical refining technique. Initially, crude Ru was transformed into H2RuCl6 by distilling treatment. The H2RuCl6 was, then, added with NH4Cl powder to precipitate (NH4)2RuCl6 powder. Afterward, the (NH4)2RuCl6 powder was ignited in air and transformed into RuO2. Finally, RuO2 was changed to Ru by hydrogen reduction method. Impurities included in the starting Ru powder were eliminated after distillation and precipitation treatments. As-obtained ruthenium particles were spherical-like agglomeration, the average size was about 6 μm and the powder density was 11.83 g/cm3. The details of chemical transforming mechanisms in the refining process were described.

scholarly journals Synthesis and Characterization of High-Purity Ultrafine Platinum Particles by Chemical Refining Method

2019 ◽  
Vol 2019 ◽  
pp. 1-8
Author(s):  
Panchao Zhao ◽  
Wei Yi ◽  
Qigao Cao ◽  
Bosheng Zhang ◽  
Kunkun Chen ◽  
...  
Keyword(s):  
Spray Drying ◽  
High Purity ◽  
Strong Acid ◽  
Platinum Resistance ◽  
Ignition Process ◽  
Chemical Refining ◽  
Platinum Particles ◽  
Acid Cation ◽  
Average Size

High-purity ultrafine platinum particles are widely used to fabricate platinum electrode oxygen sensors for automobiles and thick-film platinum resistance temperature elements. In this study, the near-spherical ultrafine Pt particles of high purity were synthesized by chemical purification, spray-drying, and ignition from crude Pt powder. Impurities in the initial Pt powder were eliminated by the 001×7 strong acid cation resin exchange column and precipitation treatment. Near-spherical (NH4)2PtCl6 particles were obtained after spray-drying, and then the microstructure and size of as-synthesized Pt particles were controlled by the ignition process. The influences of different heating temperatures during ignition treatment on the microstructure and size of Pt particles were investigated. The purity of as-synthesized Pt particles was higher than 99.999 wt%, and the average size was about 1.12 μm. The results indicate that high-purity ultrafine Pt particles can be efficiently synthesized by chemical refining.

Synthesis and characterization of Au, Pt supported on graphene aerogel catalysts for CO oxidation at low temperature

2021 ◽  
Vol 11 (1) ◽  
pp. 118-122
Author(s):  
Chuyen Phan Thi ◽  
Hang Tran Thi Thanh ◽  
Phong Pham Nam ◽  
Ha Vu Thi Thu
Keyword(s):  
Low Temperature ◽  
Ambient Temperature ◽  
Co Oxidation ◽  
Pt Nanoparticles ◽  
Molar Ratio ◽  
Synthesis And Characterization ◽  
Graphene Aerogel ◽  
Highly Dispersed ◽  
Average Size

Au, Pt supported on graphene aerogel catalysts (PtAu/rGOA) with molar ratio of Pt and Au of 1:1, and total metal concentration of 5 % were successfully synthesized by hydrothermal method.  The obtained catalysts were characterized by Raman, XRD, XPS, HR-TEM, BET. It revealed that Au and Pt nanoparticles with average size of 3 – 5 nm were highly dispersed on aerogel graphene. The activity of these catalysts was tested  in CO oxidation. The results showed that the conversion of CO at ambient temperature was 100% during 25 minutes. Accordingly, PtAu/rGOA could be considered as a potential catalysts for CO oxidation at low temperature.

Synthesis and characterization of Ag/PVA nanorods by chemical reduction method

2008 ◽  
Vol 40 (10) ◽  
pp. 3183-3186 ◽  
Author(s):  
M.A.S. Sadjadi ◽  
Babak Sadeghi ◽  
M. Meskinfam ◽  
K. Zare ◽  
J. Azizian
Keyword(s):  
Reduction Method ◽  
Chemical Reduction ◽  
Synthesis And Characterization ◽  
Chemical Reduction Method

Synthesis and Characterization of Cu2FeSnS4 Semiconductor Nanocrystals with Zincblende Structure

2012 ◽  
Vol 512-515 ◽  
pp. 2019-2022 ◽  
Author(s):  
Xiao Lu Liang ◽  
Xian Hua Wei
Keyword(s):  
Random Distribution ◽  
Semiconductor Nanocrystals ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Nir Absorption ◽  
Average Size

Cu2FeSnS4semiconductor nanocrystals with zincblende structure have been successfully synthesized by a hot-injection approach. Cu+, Fe2+, and Sn4+cations have a random distribution in the zincblende unit cell, and the occupancy possibilities are 1/2, 1/4 and 1/4, respectively. Those nanocrystals were characterized by means of X-ray diffraction (XRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED), energy dispersive spectroscopy (EDS), and UV-Vis-NIR absorption spectroscopy. The Cu2FeSnS4 nanocrystals have an average size of 7.5 nm and a band gap of 0.92 eV.

Formation Characterization of Ultra-Fine Cu Powder from Cu(OH)2 Slurry by Wet Reduction Method

2006 ◽  
Vol 510-511 ◽  
pp. 646-649
Author(s):  
Jong Gwan Ahn ◽  
Dong Jin Kim ◽  
Hai Hoang ◽  
Jae Ryeong Lee ◽  
Hun Saeng Chung
Keyword(s):  
Feeding Rate ◽  
Reduction Method ◽  
Hydrazine Monohydrate ◽  
Temperature Reduction ◽  
Stirring Rate ◽  
Copper Powders ◽  
Average Size ◽  
Fine Copper

Ultra-fine copper powders with an average size of 150 nm were synthesized from Cu(OH)2 .H2O slurry with hydrazine monohydrate as a reduction agent by using the wet reduction method. Parameters such as temperature, reduction agent feeding rate, stirring rate, stirring speed, Cu(OH)2 concentration, and surfactants were investigated. It was found that the feeding rate of hydrazine monohydrate and the use of surfactants mainly affect the morphology and size of the copper powders along with their dispersion. XRD, PSA, and SEM were used to characterize the prepared particles.

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