Catalytic methane combustion over iron/nitrogen-doped silicon carbide

RSC Advances ◽  
2016 ◽  
Vol 6 (88) ◽  
pp. 85559-85563 ◽  
Author(s):  
Hiroyuki Koshikawa ◽  
Shuji Nakanishi ◽  
Kazuhito Hashimoto ◽  
Kazuhide Kamiya
Keyword(s):  
Silicon Carbide ◽  
Catalytic Combustion ◽  
Methane Combustion ◽  
Nitrogen Doped ◽  
Doped Silicon ◽  
Catalytic Combustion Of Methane

We report that the catalytic combustion of methane was accelerated over iron and nitrogen-modified silicon carbide.

A Ceramic-Membrane-Based Methane Combustion Reactor With Tailored Function of Simultaneous Separation of Carbon Dioxide From Nitrogen

2014 ◽  
Author(s):  
Ryan Falkenstein-Smith ◽  
Kang Wang ◽  
Pingying Zeng ◽  
Jeongmin Ahn
Keyword(s):  
Membrane Reactor ◽  
Catalytic Combustion ◽  
Ceramic Membrane ◽  
Methane Combustion ◽  
Pure Oxygen ◽  
Conversion Rates ◽  
Dry Pressing ◽  
Catalytic Combustion Of Methane ◽  
Combustion Processes ◽  
Combustion Reactor

Today, industry has become more dependent on natural gases and combustion processes, creating a tremendous pressure to reduce their emissions. Although the current methods such as chemical looping combustion (CLC) and pure oxygen combustion have several advantages, there are still many limitations. A ceramic membrane based methane combustion reactor is an environmentally friendly technique for heat and power generation. This work investigates the performance of a perovskite-type SrSc0.1Co0.9O3-δ (SSC) membrane reactor for the catalytic combustion of methane. For this purpose, the mixed ionic and electronic conducting SSC oxygen-permeable planar membrane was prepared by a dry-pressing technique, and the SSC powder catalyst was spray coated on the permeation side of the membrane. Then, the prepared SSC membrane with the catalyst was used to perform the catalytic combustion of methane. The oxygen permeability of the membrane reactor was studied. Also, the methane conversion rates and CO2 selectivity at various test conditions were reported.

CFD Study of the Effect of Wall Heat Conduction on Catalytic Combustion in Split and Continuous Monolith Tubes

2007 ◽  
Author(s):  
Michael Grimm ◽  
Sandip Mazumder
Keyword(s):  
Silicon Carbide ◽  
Heat Conduction ◽  
Steady State ◽  
Catalytic Combustion ◽  
Platinum Catalyst ◽  
Thermal Contact ◽  
Transient Simulations ◽  
End To End ◽  
High Reynolds ◽  
Catalytic Combustion Of Methane

The optimum length of a monolith tube is one for which near-100% conversion is attained, and at the same time, the catalyst over the entire length of the tube is utilized. In practice, the length is adjusted by stacking monolith plugs end-to-end. In this study, the repercussions of such a practice are investigated numerically with the goal to determine if a tube of length 2L demonstrates the same behavior as two tubes of length L each, stacked end-to-end. Catalytic combustion of methane-air mixture on a platinum catalyst is considered. The studies are conducted using a multi-step reaction mechanism involving 24 surface reactions between 19 species. Two different materials are considered for the walls of the monolith tube, namely silicon carbide and cordierite. Both steady state and transient simulations are performed. Results indicate that the ignition and blowout limits can be significantly different between split and continuous tubes when the wall is made up of a high thermal conductivity material, such as silicon carbide. For steady state combustion, for both wall materials, the point of attachment of the flame to the wall is altered by splitting the tube—the effect being more pronounced for silicon carbide and at relatively high Reynolds numbers. These results imply that axial heat conduction, or lack thereof due to thermal contact resistance, affects ignition and flame stability in catalytic combustion.

Ultrafine PdOx nanoparticles on spinel oxides by galvanic displacement for catalytic combustion of methane

2019 ◽  
Vol 9 (22) ◽  
pp. 6404-6414 ◽  
Author(s):  
Zeshu Zhang ◽  
Xuefeng Hu ◽  
Yibo Zhang ◽  
Liwei Sun ◽  
Heyuan Tian ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Catalytic Combustion ◽  
Methane Combustion ◽  
Galvanic Displacement ◽  
Spinel Oxides ◽  
Catalytic Combustion Of Methane

The excellent catalytic activity of methane combustion over the Pd/NiCo2O4 is attributed to ultrafine Pd nanopariticles and a tight Pd-spinel interface obtained by galvanic displacement.

Electronic Raman Studies of Shallow Donors in Silicon Carbide

2006 ◽  
Vol 527-529 ◽  
pp. 579-584 ◽  
Author(s):  
Roland Püsche ◽  
Martin Hundhausen ◽  
Lothar Ley ◽  
Kurt Semmelroth ◽  
Gerhard Pensl ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Raman Scattering ◽  
Ground State ◽  
Electronic Transitions ◽  
Nitrogen And Phosphorus ◽  
Nitrogen Doped ◽  
Electronic Raman Scattering ◽  
Doped Silicon ◽  
Donor States ◽  
Increasing Temperature

We study electronic Raman scattering of phosphorus and nitrogen doped silicon carbide (SiC) as a function of temperature in the range 7K < T < 300K. We observe a series of peaks in the Raman spectra which we assign to electronic transitions at nitrogen and phosphorus donors on different lattice sites. These transitions are identified as valley orbit transitions of the 1s donor ground state. From the polarization dependence of the observed peaks, we find that all electronic Raman signals have E2-symmetry of C6v for the hexagonal polytypes (6H-SiC and 4H-SiC) and E-symmetry of C3v for 15R-SiC. We find a reduction of the intensities of all valley-orbit Raman signals with increasing temperature and ascribe this reduction to the decreasing occupation of donor states.

scholarly journals First-principles study of the electonic structure of nitrogen-doped silicon carbide nanotubes

2009 ◽  
Vol 58 (7) ◽  
pp. 4883
Author(s):  
Song Jiu-Xu ◽  
Yang Yin-Tang ◽  
Liu Hong-Xia ◽  
Zhang Zhi-Yong
Keyword(s):  
Silicon Carbide ◽  
First Principles ◽  
Nitrogen Doped ◽  
First Principles Study ◽  
Silicon Carbide Nanotubes ◽  
Doped Silicon
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