The Oxygen Mobility and Catalytic Activity of LaMO3±δ (M=Cr, Mn, Co) Phases

1999 ◽  
Vol 602 ◽  
Author(s):  
I.A. Koudriashov ◽  
L.V. Borovskikh ◽  
G.N. Mazo ◽  
S. Scheurell ◽  
E. Kemnitz
Keyword(s):  
Gas Phase ◽  
Oxygen Diffusion ◽  
Isotope Exchange ◽  
Oxidation Reaction ◽  
Freeze Drying ◽  
Exchange Method ◽  
Type Complex ◽  
Different Types ◽  
Perovskite Type ◽  
Isotope Exchange Method

AbstractThe activity of LaMO3, where M=Cr, Mn, Co, perovskite-type complex oxides in oxygen diffusion and catalytic processes was investigated. For sample preparation freeze-drying technique was used and dynamic thermal isotope exchange method was used to study exchange reaction between 18O from the gas phase and 16O from the samples synthesized, and to investigate the methane catalytic oxidation reaction. The results obtained allowed to indicate temperature intervals of different types of reaction taking place and that LaCrO3 is far less active in mentioned reactions than LaCoO3 and LaMnO3.

Oxygen isotope exchange in La2NiO4±δ

2016 ◽  
Vol 18 (13) ◽  
pp. 9102-9111 ◽  
Author(s):  
M. V. Ananyev ◽  
E. S. Tropin ◽  
V. A. Eremin ◽  
A. S. Farlenkov ◽  
A. S. Smirnov ◽  
...  
Keyword(s):  
Gas Phase ◽  
Isotope Exchange ◽  
Exchange Method ◽  
Surface Exchange ◽  
Oxygen Isotope Exchange ◽  
Exchange Kinetics ◽  
And Diffusion ◽  
Oxygen Surface Exchange ◽  
Experimental Rig ◽  
Isotope Exchange Method

Oxygen surface exchange kinetics and diffusion have been studied by the isotope exchange method with gas phase equilibration using a static circulation experimental rig in the temperature range of 600–800 °C and oxygen pressure range of 0.13–2.5 kPa.

Applicability of an Isotope Exchange Method for the Determination of Milligram and Microgram Quantities of Organic Mercurials. I. Pharmaceutical and Agricultural Mercurials

1965 ◽  
Vol 48 (6) ◽  
pp. 1134-1138
Author(s):  
Sidney Davis ◽  
Alphonso Arnold
Keyword(s):  
Isotope Exchange ◽  
Mercury Determination ◽  
Exchange Method ◽  
Average Recovery ◽  
Low Levels ◽  
Standard Techniques ◽  
Isotope Exchange Method ◽  
Organic Mercurials ◽  
Exchange Technique

Abstract The isotope exchange technique was applied to the analysis of milligram and microgram quantities of organic mercurials, with emphasis on pharmaceuticals and fungicides of an agricultural nature. Average recovery was 98.48 ± 1.12% for Hg-203 in equilibrium with chemical mercury. In comparison studies, the isotope exchange procedure showed essential agreement with standard techniques for mercury determination. At low levels, traces of mercury via glassware contamination were observed to interfere. The digestion system was found to be applicable to most organic mercurials studied except ethyl mercuric phosphate and three commercial fungicides.

Sign in / Sign up

Export Citation Format

Share Document