scholarly journals Kinetics of the Carbon Monoxide Oxidation Reaction Under Microwave Heating

1996 ◽  
Vol 430 ◽  
Author(s):  
W. Lee Perry ◽  
Joel D. Katz ◽  
Daniel Rees ◽  
Mark T. Paffett ◽  
Abhaya Datye
Keyword(s):  
Activation Energy ◽  
Carbon Monoxide ◽  
Co Oxidation ◽  
Microwave Heating ◽  
Oxidation Reaction ◽  
Reaction Order ◽  
Thermal Gradients ◽  
Exponential Factor ◽  
Co Oxidation Reaction ◽  
Kinetics Of

Abstract915 MHz microwave heating has been used to drive the CO oxidation reaction over Pd/Al2O3 without significantly affecting the reaction kinetics. As compared to an identical conventionally heated system, the activation energy, pre-exponential factor, and reaction order with respect to CO were unchanged. Temperature was measured using a thermocouple extrapolation technique. Microwave-induced thermal gradients were found to play a significant role in kinetic observations.

scholarly journals A kinetic study of Co oxidation over the perovskite-like oxide LaSrNio4

2010 ◽  
Vol 75 (2) ◽  
pp. 249-258 ◽  
Author(s):  
Kejun Wang ◽  
Ping Zhong
Keyword(s):  
Activation Energy ◽  
Co Oxidation ◽  
Reaction Order ◽  
Space Velocity ◽  
Potential Candidate ◽  
Weight Hourly Space Velocity ◽  
Rate Determining Step ◽  
Co Oxidation Reaction ◽  
Oxygen Dissociation ◽  
Reaction Orders

The effect of reactant/product concentrations, reaction temperature and contact time on CO oxidation was investigated, using the perovskite-like oxide LaSrNiO4 as the catalyst. It was found that the reaction order of CO (reactant), as well as that of CO2 (product), is negative, the reaction orders for CO and CO2 being -0.32 and -0.51, respectively. However, the reaction order for O2 is positive, having a value of 0.62. The negative reaction order of CO and CO2 might be due to their competitive adsorption with O2, preventing the proceeding of oxygen dissociation (the rate-determining step of the reaction). The activation energy (Ea) of the reaction was calculated to be 49.3 kJ mol-1; this small activation energy suggests that LaSrNiO4 is a potential candidate for the CO oxidation reaction. The optimum weight hourly space velocity (WHSV) of the reaction was found to be 0.6 g s cm-3. The reaction conditions in the present case were (0.5-1 % CO + 0.5-2 % O2 + 0-2 % CO2), with He as the balance gas.

Curing Kinetics of Phenol Formaldehyde Resin Modified with Sodium Silicate

2012 ◽  
Vol 184-185 ◽  
pp. 1471-1479
Author(s):  
Jin Sun ◽  
Xiao Feng Zhu ◽  
Xiao Bo Wang ◽  
Rui Hang Lin ◽  
Zhen Zhong Gao
Keyword(s):  
Activation Energy ◽  
Sodium Silicate ◽  
Reaction Order ◽  
Phenol Formaldehyde ◽  
Curing Kinetics ◽  
Curing Temperature ◽  
Formaldehyde Resin ◽  
Exponential Factor ◽  
Curing Reaction ◽  
Kinetics Of

The curing kinetics of PF resin modified with sodium silicate had been investigated by differential scanning calorimetry (DSC). The kinetic analysis was performed at heating rates of 5, 10, 15, and 20°C/min，respectively. The kinetic parameters such as reaction order and activation energy were solved by Kissinger and Crane equation. The relationship between curing temperature and heating rate was also investigated. The activation energy and the curing reaction order，which were obtained by kinetic calculation, are 83.00kJ/mol and 0.917, respectively. The curing reaction kinetics equations were built by the obtained best curing temperature, reaction order, pre-exponential factor and reaction rate constant.

Kinetics of Rubber-Modified Nylon 6

2014 ◽  
Vol 887-888 ◽  
pp. 951-954
Author(s):  
Hong Kai Zhao ◽  
Hong Li Wang
Keyword(s):  
Activation Energy ◽  
Reaction Order ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Exponential Factor ◽  
First Order ◽  
Adiabatic Approach ◽  
Research Findings ◽  
Styrene Butadiene ◽  
Kinetics Of

Kinetic parameters are calculated based on the reactive temperature rise curve measured by adiabatic approach at the temperature of 145 to 160 °C with the catalytic system of NaOH and acyl caprolactam End-capped butadiene-acrylonitrile rubber (CHTBN) or styrene-butadiene rubber (CHTBS). The reaction order is first order, the activation energy is between 72.91−73.16 kJ∙mol−1 and the pre-exponential factor is between 3.22×1011− 3.38×1011 mol1−n∙s−1 in the system of CHTBN/NaOH. While in CHTBS/NaOH, the reaction order is between 1.23-1.34, the activation energy is between 85.55－86.88 kJ∙mol−1 and the pre-exponential factor is between 4.52×1011−5.0 9×1011 mol1−n∙s−1. The adiabatic reaction kinetic model of caprolactam anion was constructed based on the existing research findings, by which the polymerizing reaction is simulated. The coincidence between the simulation results and the experimental data revealed that the model is reasonable and correct.

The application of XPS to the determination of the kinetics of the co oxidation reaction over the Ir(111) surface

1976 ◽  
Vol 61 (2) ◽  
pp. 377-390 ◽  
Author(s):  
P.A. Zhdan ◽  
G.K. Boreskov ◽  
W.F. Egelhoff ◽  
W.H. Weinberg
Keyword(s):  
Co Oxidation ◽  
Oxidation Reaction ◽  
Co Oxidation Reaction ◽  
Kinetics Of

High activity and negative apparent activation energy in low-temperature CO oxidation – present on Au/Mg(OH)2, absent on Au/TiO2

2017 ◽  
Vol 7 (18) ◽  
pp. 4145-4161 ◽  
Author(s):  
Y. Wang ◽  
D. Widmann ◽  
M. Wittmann ◽  
F. Lehnert ◽  
D. Gu ◽  
...  
Keyword(s):  
Activation Energy ◽  
Low Temperature ◽  
Ir Spectroscopy ◽  
Co Oxidation ◽  
Oxidation Reaction ◽  
Reaction Behavior ◽  
Co Oxidation Reaction ◽  
Wide Range ◽  
Low Temperature Co Oxidation

Aiming at a better understanding of the unusual low-temperature CO oxidation reaction behavior on Au/Mg(OH)2 catalysts, we investigated this reaction mainly by combined kinetic and in situ IR spectroscopy measurements over a wide range of temperatures, from −90 °C to 200 °C.

Kinetics of the Microwave-Heated CO Oxidation Reaction over Alumina-Supported Pd and Pt Catalysts

1997 ◽  
Vol 171 (2) ◽  
pp. 431-438 ◽  
Author(s):  
W.Lee Perry ◽  
Joel D. Katz ◽  
Daniel Rees ◽  
Mark T. Paffet ◽  
Abhaya K. Datye
Keyword(s):  
Co Oxidation ◽  
Oxidation Reaction ◽  
Pt Catalysts ◽  
Co Oxidation Reaction ◽  
Kinetics Of ◽  
Supported Pd

Kinetics of the CO oxidation reaction on Pt(111) studied by in situ high-resolution x-ray photoelectron spectroscopy

2004 ◽  
Vol 120 (15) ◽  
pp. 7113-7122 ◽  
Author(s):  
M. Kinne ◽  
T. Fuhrmann ◽  
J. F. Zhu ◽  
C. M. Whelan ◽  
R. Denecke ◽  
...  
Keyword(s):  
High Resolution ◽  
Co Oxidation ◽  
Photoelectron Spectroscopy ◽  
Oxidation Reaction ◽  
X Ray ◽  
Co Oxidation Reaction ◽  
Kinetics Of

Kinetic studies of 5-(hydroxymethyl)-furfural formation and change of the absorption at 420 nm in fruit juices for the improvement of pasteurization plants

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Linda Katsch ◽  
Frank-Jürgen Methner ◽  
Jan Schneider
Keyword(s):  
Activation Energy ◽  
Color Change ◽  
Reaction Order ◽  
Kinetic Studies ◽  
Chemical Conversion ◽  
Lethal Effect ◽  
Microbial Inactivation ◽  
Exponential Factor ◽  
Hydroxymethyl Furfural ◽  
Kinetics Of

Abstract Preservation of juices is essential to obtain microbial safe products. There are various established methods as pasteurization. Heretofore, only the kinetic figures of microbial inactivation were considered but not those of reaction impairing the chemical quality. For a gentler processing, knowledge of the kinetics of relevant chemical conversion reactions is necessary. 5-(Hydroxymethyl)-furfural (HMF) formation and the color change of juices are important attributes. The non-isothermal Rhim method was used to determine the activation energy and pre-exponential factor for HMF formation in different juices and an isothermal method for the reaction order. Values for the activation energy from 133 to 303 kJ/mol were obtained with a zeroth reaction order. A correlation between HMF and the color change could be found. Based on the kinetic figures, lines with equal effects for the chemical changes and for the lethal effect on microorganisms were calculated. Time-temperature settings for the gentlest treatment could be found.

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