Oxidation of simple compounds and mixtures in supercritical water: carbon monoxide, ammonia and ethanol

1988 ◽  
Vol 22 (11) ◽  
pp. 1319-1324 ◽  
Author(s):  
Richard K. Helling ◽  
Jefferson W. Tester
Keyword(s):  
Carbon Monoxide ◽  
Supercritical Water

Oxidation kinetics of carbon monoxide in supercritical water

1987 ◽  
Vol 1 (5) ◽  
pp. 417-423 ◽  
Author(s):  
Richard K. Helling ◽  
Jefferson W. Tester
Keyword(s):  
Carbon Monoxide ◽  
Supercritical Water ◽  
Oxidation Kinetics ◽  
Kinetics Of

Thermodynamic Analysis of Hydrogen Production from Ethanol in Supercritical Water Oxidation

2011 ◽  
Vol 110-116 ◽  
pp. 77-82
Author(s):  
Nawadee Srisiriwat
Keyword(s):  
Carbon Dioxide ◽  
Carbon Monoxide ◽  
Hydrogen Production ◽  
Thermodynamic Analysis ◽  
Supercritical Water ◽  
Water Oxidation ◽  
Equilibrium Composition ◽  
Operating Conditions ◽  
Molar Ratio ◽  
Hydrogen Yield

A thermodynamic analysis was performed for hydrogen production from ethanol reforming and oxidation in supercritical water (SCW) conditions. The minimization of Gibbs free energy was used to calculate the equilibrium composition to investigate the effect of operating conditions, pressure, temperature, H2O2:EtOH molar ratio and H2O:EtOH molar ratio, on product yields. The theoretical results indicated that the yields of hydrogen and carbon monoxide decreased as the pressure increased but a H2/CO ratio at atmospheric pressure was lower than that at SCW conditions. High temperatures increased the efficiency of hydrogen production although the amount of carbon monoxide also increased. The presence of oxygen led to great decreases in methane oxidized to carbon dioxide and water. The spending of some hydrogen oxidized to water resulting in a lower hydrogen yield. High H2O:EtOH ratios increased the yields of hydrogen and carbon dioxide but decreased the methane and carbon monoxide production. It is possible to conclude that high temperature, high H2O:EtOH ratio and low addition of oxygen should lead to best results in the SCWO of ethanol.

Combustion of Fixed Carbon in Supercritical Water

2011 ◽  
Vol 347-353 ◽  
pp. 277-280 ◽  
Author(s):  
Hong He Ma ◽  
Shu Zhong Wang ◽  
Lu Zhou
Keyword(s):  
Mass Transfer ◽  
Carbon Monoxide ◽  
Supercritical Water ◽  
Reaction Rate ◽  
Batch Reactor ◽  
Particle Surface ◽  
Stoichiometric Ratio ◽  
Fixed Carbon ◽  
Rate Limiting Step ◽  
Burn Out

The combustion behavior of fixed carbon in supercritical water was explored by a batch reactor. Effects of reaction parameters such as reaction temperature, time, oxygen stoichiometric ratio and stirring rate were investigated. Fixed carbon was difficult to burn out, even if in a harsh condition the conversion of fixed carbon was only 51%. It is determined that for the temperature below 450°C, the process of oxidation was limited by the reaction rate between oxygen and particle surface. For the temperature above 550°C, the rate of oxygen mass transfer to the particle surface was the rate-limiting step. In the transition zone of temperature, surface reaction was comparable to mass transfer in limiting reaction rate. Only trace amount of carbon monoxide was produced at 500°C, and no carbon monoxide was detected at 600°C.

Carbon monoxide poisoning

2000 ◽  
Vol 12 (4) ◽  
pp. 354-357
Author(s):  
David R Smart ◽  
Paul D Mark
Keyword(s):  
Carbon Monoxide ◽  
Carbon Monoxide Poisoning
Sign in / Sign up

Export Citation Format

Share Document