THE KINETICS OF HYDROGEN CHEMISORPTION ON AN IRIDIUM CATALYST

1959 ◽  
Vol 37 (5) ◽  
pp. 915-921 ◽  
Author(s):  
Manfred J. D. Low ◽  
H. Austin Taylor
Keyword(s):  
Gas Pressure ◽  
Hydrogen Chemisorption ◽  
Iridium Catalyst ◽  
Elovich Equation ◽  
Kinetics Of

The kinetics of the chemisorption of hydrogen on an iridium catalyst have been studied at various temperatures and pressures. The rate of adsorption is well defined by the Elovich equation. Isothermal anomalies have been observed and were found to be a function of temperature and initial gas pressure.

RATES OF ADSORPTION OF HYDROGEN ON PALLADIUM AND ON RHODIUM

1960 ◽  
Vol 38 (4) ◽  
pp. 588-595 ◽  
Author(s):  
Manfred J. D. Low
Keyword(s):  
Gas Pressure ◽  
General Effect ◽  
Pressure Sensitive ◽  
Early Appearance ◽  
Elovich Equation ◽  
Supported Palladium ◽  
Effects Of Temperature ◽  
Temperature And Pressure ◽  
Increasing Temperature ◽  
Kinetics Of

A study of the effects of temperature and initial gas pressure on the kinetics of chemisorption of hydrogen on alumina-supported palladium and rhodium catalysts revealed, for both gas–solid systems, that the adsorption proceeded via three distinct and consecutive kinetic stages. Each stage could be described by the Elovich equation. The temporal range of existence of each kinetic stage was temperature- and pressure-sensitive, low initial pressures and high temperatures favoring early appearance of each stage. On increasing the temperatures from 0° to 400 °C, the amounts of hydrogen adsorbed on both solids decrease. Over that temperature range the rates of adsorption on Pd decrease, while those on Rh increase, with increasing temperature. The general effect of increasing the initial gas pressure over the range 10–60°mm Hg is to increase both rates and extents of adsorption.

Chemisorption of hydrogen on nickel–magnesia catalysts. Part I. General kinetic characteristics

1969 ◽  
Vol 47 (16) ◽  
pp. 2933-2941 ◽  
Author(s):  
N. S. Viswanathan ◽  
L. M. Yeddanapalli
Keyword(s):  
Experimental Data ◽  
Nickel Catalysts ◽  
Activation Energies ◽  
Effect Of Temperature ◽  
Hydrogen Chemisorption ◽  
Kinetic Characteristics ◽  
Wide Range ◽  
Elovich Equation ◽  
Kinetics Of

A detailed study of the kinetics of hydrogen chemisorption on 3 different nickel catalysts, supported on magnesia and prepared by coprecipitation, has been made over a wide range of pressures and temperatures. The results have been analyzed in the light of the Elovich equation. Experimental data obtained by variations of pressure and temperature indicate the existence of a number of stages in the chemisorption process and support the multiple kinetic stage hypothesis suggested by Low. The effect of temperature on the parameters has been studied, and relations obtained which have been used to calculate activation energies for each of the stages.

Kinetics of the hydrogen chemisorption process for Nb

1988 ◽  
Vol 38 (8) ◽  
pp. 5716-5718 ◽  
Author(s):  
Suck-Whan Kim ◽  
Ki-Soo Sohn ◽  
Tong-Soo Park ◽  
Yung-Joo Kim
Keyword(s):  
Hydrogen Chemisorption ◽  
Kinetics Of

scholarly journals Kinetics of scandium recovery by TVEX-TBP from the solution formed after the salt chlorinator cake leaching

2020 ◽  
Vol 168 ◽  
pp. 00050
Author(s):  
Vadym Korovin ◽  
Yurii Pohorielov ◽  
Yurii Shestak ◽  
Oleksandr Valiaiev ◽  
Jose Luis Cortina
Keyword(s):  
Chemical Interaction ◽  
Extraction Process ◽  
Second Order ◽  
Order Kinetic ◽  
Order Model ◽  
Elovich Equation ◽  
Diffusion Phase ◽  
Leaching Solution ◽  
Pseudo Second Order ◽  
Kinetics Of

Kinetics of scandium recovery by TVEX containing tributyl phosphate was studied from the clarified leaching solution of salt chlorinator cake. To assess the contribution of each diffusion phase, experimental data were analyzed using a graphic method. To define the contribution of chemical interaction into the scandium extraction process, recovery kinetics was quantitatively described using pseudo-first order, pseudo-second order kinetic models and Elovich equation in linearized form. It was established that recovery kinetics was most accurately described with the pseudo-second-order model.

Elovich Equation for the Kinetics of Isotopic Exchange Reactions at Solid–Liquid Interfaces

Nature ◽  
1970 ◽  
Vol 226 (5241) ◽  
pp. 148-149 ◽  
Author(s):  
R. J. ATKINSON ◽  
F. J. HINGSTON ◽  
A. M. POSNER ◽  
J. P. QUIRK
Keyword(s):  
Isotopic Exchange ◽  
Liquid Interfaces ◽  
Exchange Reactions ◽  
Elovich Equation ◽  
Solid Liquid ◽  
Kinetics Of

HYDROGEN CHEMISORPTION ON NICKEL–MAGNESIA CATALYSTS

1963 ◽  
Vol 41 (1) ◽  
pp. 68-73 ◽  
Author(s):  
N. Ramasubramanian ◽  
L. M. Yeddanapalli
Keyword(s):  
Kinetic Data ◽  
Pressure Range ◽  
Hydrogen Adsorption ◽  
Catalyst Surface ◽  
Hydrogen Chemisorption ◽  
Oxygen Contamination ◽  
Different Types ◽  
Elovich Equation ◽  
Temperature And Pressure ◽  
Oxygen Addition

The hydrogen adsorption activities, per gram of nickel, of two nickel–magnesia catalysts are compared and explained on the basis of different types of nickel being present. The application of the Elovich equation to interpret the kinetic data shows the possibility of the presence of three kinetic stages in the temperature and pressure range studied. A study of the effect, on the hydrogen adsorption, of deliberate oxygen addition to and re-reduction of the catalyst surface shows that the nature of the oxygen contamination in the catalyst is different from that of the added oxygen.

Kinetics of hydrogen chemisorption by niobium on surfaces

1988 ◽  
Vol 37 (3) ◽  
pp. 1155-1160 ◽  
Author(s):  
Ki-Soo Sohn ◽  
Tong-Soo Park ◽  
Suck-Whan Kim
Keyword(s):  
Hydrogen Chemisorption ◽  
Kinetics Of
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