ChemInform Abstract: Claus Catalysis. Part 1. Adsorption of SO2 on the Alumina Catalyst Studied by FTIR and EPR Spectroscopy. Part 2. FTIR Study of the Adsorption of H2S on the Alumina Catalyst. Part 3. FTIR Study of the Sequential Adsorption of SO2 and H

1985 ◽  
Vol 16 (19) ◽  
Author(s):  
A. DATTA ◽  
R. G. CAVELL ◽  
R. W. TOWER ◽  
Z. M. GEORGE
Keyword(s):  
Epr Spectroscopy ◽  
Alumina Catalyst ◽  
Ftir Study ◽  
Sequential Adsorption

TPR and FTIR Study of Nitrided Molybdena-Alumina Catalyst

2010 ◽  
Vol 104 (4-5) ◽  
pp. 311-316
Author(s):  
M. Nagal ◽  
T. Kusagaya ◽  
A. Miyata ◽  
S. Oml
Keyword(s):  
Alumina Catalyst ◽  
Ftir Study

Claus catalysis. 1. Adsorption of sulfur dioxide on the alumina catalyst studied by FTIR and EPR spectroscopy

1985 ◽  
Vol 89 (3) ◽  
pp. 443-449 ◽  
Author(s):  
Arunabha Datta ◽  
Ronald G. Cavell ◽  
Robert W. Tower ◽  
Zacheria M. George
Keyword(s):  
Sulfur Dioxide ◽  
Epr Spectroscopy ◽  
Alumina Catalyst

Rapid Isolation of High Molecular Weight Urokinase from Native Human Urine

1982 ◽  
Vol 47 (03) ◽  
pp. 197-202 ◽  
Author(s):  
Kurt Huber ◽  
Johannes Kirchheimer ◽  
Bernd R Binder
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Human Urine ◽  
Gel Filtration ◽  
Chain Structure ◽  
The Other ◽  
Single Chain ◽  
Apparent Homogeneity ◽  
Sequential Adsorption

SummaryUrokinase (UK) could be purified to apparent homogeneity starting from crude urine by sequential adsorption and elution of the enzyme to gelatine-Sepharose and agmatine-Sepharose followed by gel filtration on Sephadex G-150. The purified product exhibited characteristics of the high molecular weight urokinase (HMW-UK) but did contain two distinct entities, one of which exhibited a two chain structure as reported for the HMW-UK while the other one exhibited an apparent single chain structure. The purification described is rapid and simple and results in an enzyme with probably no major alterations. Yields are high enough to obtain purified enzymes for characterization of UK from individual donors.

NMR and EPR Spectroscopy

1963 ◽  
Vol 36 (3_4) ◽  
pp. 247-248
Author(s):  
H. Dreeskamp
Keyword(s):  
Epr Spectroscopy

Modelling of catalyst pellet deactivation

1985 ◽  
Vol 50 (11) ◽  
pp. 2381-2395
Author(s):  
Alena Brunovská ◽  
Ján Buriánek ◽  
Ján Ilavský ◽  
Ján Valtýni
Keyword(s):  
Experimental Data ◽  
Numerical Results ◽  
Benzene Hydrogenation ◽  
Alumina Catalyst ◽  
Temperature Changes ◽  
Catalyst Pellet ◽  
Model Equations ◽  
Catalytic Poison

The diffusion and the shell progressive models of deactivation caused by irreversible chemisorption of a catalytic poison are presented for a single catalyst pellet. The method for solution of the model equations is proposed. The numerical results are compared with experimental data obtained by measuring concentration and temperature changes due to thiophene poisoning in benzene hydrogenation over a nickel-alumina catalyst.

Properties of electrochemically generated primary cationradicals of phenyl- and 2-(4-tolyl)-1,3,4,7-tetramethylisoindoles

1980 ◽  
Vol 45 (6) ◽  
pp. 1669-1676 ◽  
Author(s):  
Pavel Kubáček
Keyword(s):  
Electrochemical Oxidation ◽  
Spin Polarization ◽  
High Spin ◽  
Epr Spectroscopy ◽  
Half Life ◽  
Electrochemical Behaviour ◽  
Epr Spectra ◽  
Electrochemical Generation ◽  
Splitting Constant ◽  
Reduced Temperature

The first step of electrochemical oxidation of 2-phenyl- and 2-(4-tolyl)-1,3,4,7-tetramethylisoindoles in anhydrous acetonitrile produces relatively stable cationradicals which have been studied by means of EPR spectroscopy using the method of internal electrochemical generation of radicals under reduced temperature. The same electrochemical behaviour of the both studied derivatives and identical EPR spectra of their cationradicals can be explained within the Huckel MO method. The largest contribution to the magnitude of splitting constant of nitrogen nucleus is due to π-σ-spin polarization of C-N bonds caused by high spin abundance of pz-AO of carbon atoms. Half-life of decomposition of the studied cationradicals is 4 min at -30°C.

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