Profile
Keywords: carbon black, aerosol, hydrogen production, pyrolysis
Dr Jason Olfert is a Professor in Mechanical Engineering at the University of Alberta. His research is focused on developing novel aerosol instruments, characterizing particulate emissions from combustion sources, and understanding how aerosols affect global climate. Dr. Olfert’s past and current research is focused on particulate emissions from internal combustion engines, gas turbine engines, flares, and burners. He has worked on the development of the centrifugal particle mass analyzer and aerodynamic aerosol classifier which are sold or licensed by Cambustion Ltd. Dr Olfert has been awarded the Sheldon K Friedlander Award, Masao Horiba Award, and Fissan-Pui-TSI Award for his contributions to aerosol science.
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Analysis of the products and kinetic rates of methane thermal decomposition. Part II: Numerical models Not a formal publication, so that results can be published in a Journal without copyright issues
T02-P01, T02-P06 University of Alberta, Carleton Unviersity Publication 2019-05-16 T02-P01, T02-P06 Analysis of the products and kinetic rates of methane thermaldecomposition. Part I: Experimental apparatus T02-P01, T02-P06 University of Alberta, Carleton Unviersity Publication 2019-05-16 T02-P01, T02-P06 Kinetics of methane pyrolysis: An optimized mechanism Not a formal publication, so that results can be published in a Journal without copyright issues
T02-P01, T02-P06 University of Alberta, Carleton Unviersity Publication 2020-02-19 T02-P01, T02-P06 Experimental and numerical analysis of methane pyrolysis at elevated pressure Gas-phase kinetics play an important role in understanding the intermediate species formation during methane pyrolysis. A previously proposed reaction mechanism by Dean was modified, and optimal values of the pre-exponential factors were obtained using sensitivity analysis and optimization. A significant improvement in the model predictions was observed once the optimal pre-exponential factor values were implemented in the reaction mechanism. The numerical results obtained in the temperature and pressure range of 1000--1400 K and 0.1--3 atm, respectively, were in close agreement with the major gas-phase species concentration profiles up to the start of carbon formation. The autocatalysis effect observed in ethane was found to be temperature-dependent and completely disappeared above 1300 K. The inhibition effect of hydrogen addition in the initial mixture on methane conversion was found to be in close agreement with the available studies in the literature. The optimized mechanism can be used to accurately predict methane conversion, including the primary, secondary and tertiary gas-phase products. T02-P01 University of Alberta, Carleton Unviersity Publication 2023-09-01 T02-P01 Dataset of methane pyrolysis products in a batch reactor as a function of time at high temperatures and pressures T02-P01, T02-P06 Carleton Unviersity, University of Alberta Publication 2023-04-01 T02-P01, T02-P06 A Reduced Methane Pyrolysis Mechanism for Above-Atmospheric Pressure Conditions T02-P01 Carleton Unviersity, University of Alberta Publication 2024-09-01 T02-P01 Characterization of particles generated by non-catalytic methane pyrolysis in a tubular flow reactor T02-P01 University of Alberta Publication 2024-11-08 Arash Naseri, Ehsan Abbasi Atibeh,
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Shen, J. ,
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Olfert, J. T02-P01 Preliminary experimental study of methane decarbonization using a laminar premixed flame Not a formal publication, so that results can be published in a Journal without copyright issues
T02-P01, T02-P06 University of Alberta, Carleton Unviersity Publication 2017-05-18 T02-P01, T02-P06 Properties of carbon particles generated by methane decarbonization in oxygen deficient gas streams Not a formal publication, so that results can be published in a Journal without copyright issues
T02-P01, T02-P06 Carleton Unviersity, University of Alberta Publication 2018-09-07 T02-P01, T02-P06 Nanoparticle Emission Characteristics during Methane Pyrolysis in a Laminar Premixed Flame T02-P01, T02-P06 Carleton Unviersity, University of Alberta Activity 2018-04-16 T02-P01, T02-P06 Journal of Aerosol Science Morphology and volatility of particulate matter emitted from a gasoline direct injection engine fuelled on gasoline and ethanol blendsT01-P04 University of Alberta Publication 2018-04-23 T01-P04 Properties of carbon black produced by the thermal decomposition of methane in the products of premixed flames The thermal decomposition of methane is a technique used to manufacture hydrogen gas and carbon black. The physical properties of carbon black produced by the thermal decomposition of methane (TDM) in the O2-deficient gas products of two premixed flames (propane- or methane- air) were investigated under different flow rates of decomposing methane injection (0.5–5 SLPM). An inverted burner was designed to provide a fuel-rich, laminar premixed flame, to produce hot gas into which methane was injected to thermally decompose inside a reactor. Particles from TDM were extracted by a nitrogen dilution system at the immediate exit of the reaction chamber, where another branch of the exhaust was dried and directed to a gas chro- matograph. The carbon black particles were characterized by size resolved number concentra- tion, mass concentration, effective density, volatility, and internal mixing state using different arrangements of a differential mobility analyzer, catalytic denuder, centrifugal particle mass analyzer, and condensation particle counter, as well as by morphology and primary particle size using transmission electron microscopy. A bimodal number-size distribution was observed at all conditions with count median diameters (CMDs) less than 58 nm and 21 nm when using pro- pane- or methane-air premixed flames as the heat source, respectively. Higher number con- centrations and mass concentrations with larger CMDs were achieved under lower flow rates of decomposing methane injection. For a given flow rate of decomposition methane, mass con- centration and CMD increased significantly when using propane as the fuel, compared to the methane fuel. The size segregated mass fraction of internally mixed volatile content in particles was similar for both heat sources, showing a roughly constant fraction of volatile material in particles produced by the decomposition of 0.5 and 5 SLPM of methane (10%–30%) but a measurably larger fraction (55%–30%) with a decreasing trend as a function of particle size from the decomposition of 1 SLPM of methane. The effective density of denuded particles was similar, but slightly higher, than the effective density of soot from a wide range of internal combustion engines. A higher denuded effective density was observed in the particles with higher volatile contents (particles from decomposition of 1 SLPM of methane), suggesting the restructuring of carbon black into more compact clusters due to excessive volatile condensation. TEM analysis revealed some similarity between the produced carbon black and engine soot in terms of mor- phology and primary particle diameter (both below 40 nm). Beside the carbon black properties, the efficiency of TDM in this configuration was also investigated by evaluation of methane de- struction efficiency, as well as carbon black and hydrogen production efficiencies, based on the product gas composition and the particle mass concentration. It was found that longer residence times corresponding to lower flow rates resulted in higher conversion efficiencies in terms of methane destruction efficiency (maximum of ∼95%), hydrogen production efficiency (maximum of 80%), and carbon black production efficiency (maximum of 1%). It was concluded that the significantly low efficiency of carbon black production is due to the high amount of CO forma- tion, likely through the gasification process.T02-P01, T02-P06 Carleton Unviersity, University of Alberta Publication 2019-02-23 T02-P01, T02-P06 New hydrogen production method T02-P01 University of Alberta Activity 2022-04-19 T02-P01 New research exploring more environmentally friendly ways to extract hydrogen, T02-P01 University of Alberta Activity 2022-04-27 T02-P01 Hydrogen research heats up T02-P01 University of Alberta Activity 2022-04-13 T02-P01 U of A researchers at forefront of the province's hydrogen future T02-P01 University of Alberta Activity 2022-04-29 T02-P01
