Electropolymerization of polypyrrole, modified with germanium, on a passivated titanium electrode in aqueous nitrate solution: new results on catalytic reduction of protons and dissolved oxygen

2001 ◽  
Vol 5 (5) ◽  
pp. 339-347 ◽  
Author(s):  
S. Mokrane ◽  
L. Makhloufi ◽  
H. Hammache ◽  
B. Saidani
Keyword(s):  
Dissolved Oxygen ◽  
Catalytic Reduction ◽  
Nitrate Solution ◽  
Titanium Electrode ◽  
Aqueous Nitrate Solution

scholarly journals Acid-basic properties of chromium(III) oxide surface

2021 ◽  
Vol 57 (3) ◽  
pp. 270-277
Author(s):  
E. A. Shaporova ◽  
A. A. Zhukova ◽  
A. K. Baev ◽  
A. Yu. Sidorenko
Keyword(s):  
Binary Systems ◽  
Ionization Constant ◽  
Nitrate Solution ◽  
Structural Features ◽  
Oxide Surface ◽  
Acid Base ◽  
X Ray ◽  
Oxide Hydroxide ◽  
Nanosized Catalysts ◽  
Aqueous Nitrate Solution

The article is devoted to the study of the nature and number of acid-base centers on the surface of chromium(III) oxide obtained by precipitation from an aqueous nitrate solution. The curve of the distribution of the number of acidbase centers of the samples is plotted depending on the indicator of the ionization constant of indicators. It was determined that the main Lewis centers make the main contribution to the acidity of the samples; there are also Bronsted centers of different acidity. A comparative analysis of the structural features of the surface of oxides of chromium, zinc and binary systems Cr (III)–Zn (II) was carried out according to the results of X-ray phase analysis of oxides and thermolysis of the corresponding hydroxides. Based on this, the possibility of obtaining nanosized catalysts based on oxide-hydroxide systems of chromium with a number of 3d-metals obtained in the process of polynuclear hydroxocomplexation is predicted.

Formation of mutagens by photolysis of aromatic compounds in aqueous nitrate solution

1982 ◽  
Vol 29 (5) ◽  
pp. 511-516 ◽  
Author(s):  
Junzo Suzuki ◽  
Hiroshi Okazaki ◽  
Yuki Nishi ◽  
Shizuo Suzuki
Keyword(s):  
Aromatic Compounds ◽  
Nitrate Solution ◽  
Aqueous Nitrate Solution

Acoustic Levitation as an IR Spectroscopy Sampling Technique

1989 ◽  
Vol 43 (2) ◽  
pp. 253-257 ◽  
Author(s):  
J. T. Cronin ◽  
T. B. Brill
Keyword(s):  
Nitrate Solution ◽  
Sampling Technique ◽  
Surfactant Solution ◽  
Solid Particles ◽  
Acoustic Levitation ◽  
Liquid Droplets ◽  
Aqueous Nitrate Solution ◽  
Ft Ir ◽  
Sample Support ◽  
Support Methods

Acoustic levitation of liquid droplets (< 4 mm diameter), bubbles, and solid particles is described as an unusual sampling technique for obtaining the infrared spectrum of samples that might be incompatible with conventional sample support methods, and for studies of materials under extreme conditions. Excellent FT-IR spectra were recorded of bubbles of a concentrated aqueous nitrate solution, of mineral oil, and of an aqueous surfactant solution. Polymethacrylic acid packing foam also produced a high-quality spectrum. Large aqueous droplets and dense solids gave unsatisfactory spectra. The design of the levitator and various spectroscopic considerations are discussed.

Ba2YCu3O6.9 Powder Preparation by Sol-Gel Emulsion Techniques

1987 ◽  
Vol 99 ◽  
Author(s):  
M. J. Cima ◽  
R. Chiu ◽  
W. E. Rhine
Keyword(s):  
Sol Gel ◽  
Nitrate Solution ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
Powder Preparation ◽  
Powder Morphology ◽  
Aqueous Nitrate Solution ◽  
Emulsion Process ◽  
Micrometer Scale ◽  
Barium Yttrium

ABSTRACTBarium yttrium cuprate powders were prepared by a sol-gel emulsion process in which an aqueous nitrate solution containing Ba, Y, and Cu in the correct stoichiometry was emulsified in heptane. The resulting micrometer-sized droplets were gelled by adding a high-molecular-weight primary amine that extracts nitric acid from the aqueous phase and raises the pH of the droplets. Thermal gravimetric analysis revealed that the correct overall stoichiometry was obtained at temperatures lower than 400 °C during calcination, but X-ray diffraction showed that calcination at temperatures greater than 800° may be required to produce the correct phase. One possible advantage of this technique is the control of powder morphology on a micrometer scale so that powders can be prepared for advanced ceramics processing methods. Also, segregation of components, if any, will be restricted to distances less than one micrometer.

Extraction of samarium and gadolinium from aqueous nitrate solution with D2EHPA in a pulsed disc and doughnut column

2015 ◽  
Vol 48 ◽  
pp. 18-25 ◽  
Author(s):  
R. Torkaman ◽  
J. Safdari ◽  
M. Torab-Mostaedi ◽  
M.A. Moosavian ◽  
M. Asadollahzadeh
Keyword(s):  
Nitrate Solution ◽  
Aqueous Nitrate Solution
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