Robust Pt@TiOx/TiO2 Catalysts for Hydrocarbon Combustion: Effects of Pt-TiOx Interaction and Sulfates

ACS Catalysis ◽  
2020 ◽  
Vol 10 (22) ◽  
pp. 13543-13548
Author(s):  
Hao Hao ◽  
Baofang Jin ◽  
Wei Liu ◽  
Xiaodong Wu ◽  
Fengfu Yin ◽  
...  
Keyword(s):  
Hydrocarbon Combustion

Mechanisms performance and pressure dependence of hydrogen/air burner-stabilized flames

2018 ◽  
Vol 13 (6) ◽  
pp. 51
Author(s):  
V. Bykov ◽  
V.V. Gubernov ◽  
U. Maas
Keyword(s):  
Chemical Kinetics ◽  
Critical Mass ◽  
Molecular Transport ◽  
Kinetic Mechanism ◽  
Elevated Pressure ◽  
Porous Plug ◽  
Combustion System ◽  
Hydrocarbon Combustion ◽  
Chemical Reaction Mechanisms ◽  
Combustion Processes

The kinetic mechanism of hydrogen combustion is the most investigated combustion system. This is due to extreme importance of the mechanism for combustion processes, i.e. it is present as a sub-mechanism in all mechanisms for hydrocarbon combustion systems. Therefore, detailed aspects of hydrogen flames are still under active investigations, e.g. under elevated pressure, under conditions of different heat losses intensities and local equivalence ratios etc. For this purpose, the burner stabilized flame configuration is an efficient tool to study different aspects of chemical kinetics by varying the stand-off distance, pressure, temperature of the burner and mixture compositions. In the present work, a flat porous plug burner flame configuration is revisited. A hydrogen/air combustion system is considered with detailed molecular transport including thermo-diffusion and with 8 different chemical reaction mechanisms. Detailed numerical investigations are performed to single out the role of chemical kinetics on the loss of stability and on the dynamics of the flame oscillations. As a main outcome, it was found/demonstrated that the results of critical values, e.g. critical mass flow rate, weighted frequency of oscillations and blow-off velocity, with increasing the pressure scatter almost randomly. Thus, these parameters can be considered as independent and can be used to improve and to validate the mechanisms of chemical kinetics for the unsteady dynamics.

A numerical model of high intensity confined hydrocarbon combustion

1980 ◽  
Vol 38 ◽  
pp. 259-270 ◽  
Author(s):  
H.A. Arbib ◽  
Y. Goldman ◽  
J.B. Greenberg ◽  
Y.M. Timnat
Keyword(s):  
Numerical Model ◽  
High Intensity ◽  
Hydrocarbon Combustion

Synthetic kenyaite as catalyst support for hydrocarbon combustion

2006 ◽  
Vol 66 (3-4) ◽  
pp. 192-197 ◽  
Author(s):  
Yuri Kalvachev ◽  
Vladislav Kostov-Kytin ◽  
Silvia Todorova ◽  
Krasimir Tenchev ◽  
Georgi Kadinov
Keyword(s):  
Catalyst Support ◽  
Hydrocarbon Combustion

CH(A2Δ) Formation in Hydrocarbon Combustion:  The Temperature Dependence of the Rate Constant of the Reaction C2H + O2→ CH(A2Δ) + CO2

2005 ◽  
Vol 109 (45) ◽  
pp. 10287-10293 ◽  
Author(s):  
Rehab M. I. Elsamra ◽  
Stijn Vranckx ◽  
Shaun A. Carl
Keyword(s):  
Temperature Dependence ◽  
Rate Constant ◽  
Hydrocarbon Combustion

Emission Characteristics of NO and NO2 in Rich-Lean Combustion of Hydrogen

2003 ◽  
Author(s):  
T. Shudo ◽  
K. Omori ◽  
O. Hiyama
Keyword(s):  
Gas Turbines ◽  
Nox Reduction ◽  
Hydrogen Combustion ◽  
Hydrocarbon Fuels ◽  
Nox Emission ◽  
Diffusion Combustion ◽  
Lean Combustion ◽  
Hydrocarbon Combustion ◽  
The Rich ◽  
Reduction Effect

Hydrogen is expected as a clean and renewable alternative to the conventional hydrocarbon fuels. Because the only possible pollutants from the hydrogen combustion are nitrogen oxides (NOx), it is crucial to reduce the NOx emission in the hydrogen utilization. The rich-lean combustion is well known as a technique to reduce the emission of the Zel’dovich NO from the continuous combustion burners for such as gas turbines and boilers. Because the Zel’dovich NO occupies a large part of the total NOx emission, the rich-lean combustion is quite effective to reduce the NOx emission. However, the NOx reduction effect of the rich-lean combustion has not yet been proven for the hydrogen fuel, while the effect has been demonstrated for the hydrocarbon fuels. On the other hand, the prompt NO is emitted from the hydrocarbon combustion especially under the fuel-rich conditions. Though the amount of the prompt NO is quite small for premixed or diffusion combustion, it could be a relatively significant part in the total NO emission from the rich-lean combustion due to the decreased Zel’dovich NO. The authors estimate that hydrogen is more suitable for the rich-lean combustion compared with hydrocarbons, because hydrogen does not emit the prompt NO even under the fuel-rich conditions which necessarily exist in the rich-lean combustion. This research proposes the rich-lean combustion as a method to reduce the NOx emission from hydrogen combustion and experimentally analyzes the characteristics using a coaxial rich-lean burner with varying the mixture conditions.

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