On the high pressure rate constants for the H/Mu + O2 addition reactions

2001 ◽  
Vol 3 (4) ◽  
pp. 505-507 ◽  
Author(s):  
J. M. C. Marques ◽  
A. J. C. Varandas
Keyword(s):  
High Pressure ◽  
Rate Constants ◽  
Addition Reactions

Development of a gas chromatograph-mass spectrometer with ‘on-line’ computer for studies in catalysis. Reactions of ethylene and deuterium on oxides

1974 ◽  
Vol 338 (1614) ◽  
pp. 299-310 ◽  
Keyword(s):  
Zinc Oxide ◽  
Heterogeneous Catalysis ◽  
Magnesium Oxide ◽  
Chromium Oxide ◽  
Rate Constants ◽  
High Selectivity ◽  
Addition Reactions ◽  
Gas Chromatograph ◽  
On Line ◽  
Catalytic Behaviour

The development of an ‘on-line’ computer for use with a combined gas chromatographymass spectroscopy (g.c.-m.s.) technique in the study of heterogeneous catalysis is described and discussed with reference to the reactions of ethylene and deuterium on oxides. Emphasis has been placed on the selectivities shown by a number of catalysts for the exchange and addition reactions. Magnesium oxide effects the exchange of ethylene without production of ethane even at 671 K; y-alumina also exhibits a high selectivity for exchange. In contrast, on chromium oxide (Cr20 3) at 197 K and zinc oxide at 273 K, ethylene undergoes rapid deuteration with no observable exchange of the olefin. For the range of catalysts studied the ratio of rate constants for the exchange and addition reactions decreases in the order: MgO > Al 2 O 3 > TiO 2 ~ Fe 2 O 3 > Co 3 O 4 > ZrO 2 > ZnO ~ Cr 2 O 3 . An explanation for the marked differences in catalytic behaviour within this group of oxides is provided.

scholarly journals Kinetic Study of Photocatalytic Degradation of Tolonium Chloride Under High Pressure Irradiation in Aquatic Buffer Systems

2011 ◽  
Vol 8 (s1) ◽  
pp. S19-S26 ◽  
Author(s):  
M. Montazerozohori ◽  
S. Nezami ◽  
S. Mojahedi
Keyword(s):  
High Pressure ◽  
Photocatalytic Degradation ◽  
Kinetic Study ◽  
Rate Constants ◽  
Order Kinetic ◽  
Optimum Conditions ◽  
First Order ◽  
Reactor Cell ◽  
Order Kinetic Model ◽  
Tolonium Chloride

Anatase titanium dioxide catalyzed photodegradation of tolonium chloride at various bufferic pH of 2, 7, 9 and 12 in aqueous solution is presented. The effect of some physicochemical parameters such as initial concentration of dye, catalyst amount and reaction time on photocatalytic degradation has been investigated in a photo-reactor cell containing high pressure mercury lamp to obtain the optimum conditions in each bufferic pH at constant temperature. A complete spectrophotometric kinetic study of tolonium chloride under high pressure irradiation at buffer media was performed. The photocatalytic degradation observed rate constants (kobs) were found to be 2.90×10-3, 3.30×10-3, 3.20×10-3and 5.20×10-3min-1for buffer pH of 2-12 respectively. It was found that a pseudo-first-order kinetic model based on Langmuir-Hinshelwood one is usable to photodegradation of this compound at all considered buffer pH. In addition to these, the Langmuir-Hinshelwood rate constants, krfor the titled compound at various pH are reported.

The analysis of muonium hyperfine interaction measurements of thermal rate constants for addition reactions

1991 ◽  
Vol 94 (4) ◽  
pp. 2794-2806 ◽  
Author(s):  
Ronald J. Duchovic ◽  
Albert F. Wagner ◽  
Ralph Eric Turner ◽  
David M. Garner ◽  
Donald G. Fleming
Keyword(s):  
Hyperfine Interaction ◽  
Rate Constants ◽  
Addition Reactions ◽  
Thermal Rate Constants ◽  
Muonium Hyperfine ◽  
Rate Constants For Addition

Temperature dependence of the limiting low- and high-pressure rate constants for the CH3O+NO2+He reaction over the 250–390 K temperature range

2000 ◽  
Vol 329 (3-4) ◽  
pp. 191-199 ◽  
Author(s):  
E. Martı́nez ◽  
J. Albaladejo ◽  
E. Jiménez ◽  
A. Notario ◽  
Y. Dı́az de Mera
Keyword(s):  
High Pressure ◽  
Temperature Dependence ◽  
Rate Constants ◽  
Temperature Range
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