Abstract
The kinetics for crude glycerol autothermal reforming was studied over S/C ratio of 2.6 and O2/C ratio of 0.125 using 5% Ni/CeZrCa catalyst. Both power law and mechanistic kinetic models were studied. The overall power law model for crude glycerol autothermal reforming was investigated with a pre-exponential factor of 4.3 × 1010 mol/gcat·min and activation energy of 8.78 × 104 J/mol. The reaction orders with respect to crude glycerol, water and oxygen are 1.04, 0.54 and 1.78 respectively. The power law model presented an absolute average deviation of 5.84%, which showed a good correlation between the predicted and experimental rate. Mechanistic models were developed for crude glycerol autothermal reforming. For steam reforming, the Eley–Rideal approach best described the reaction rate with the surface reaction being the rate-determining step (AAD < 10%). The kinetics of the total oxidation reaction was best described by the power law model with an AAD of less than 1%, whereas for the TOR process, the molecular adsorption of crude glycerol with an AAD of 14.6% via Langmuir Hinshelwood Hougen-Watson approach was best. CO2 methanation resulted in an AAD of 5.8% for the adsorption of carbon dioxide (CO2) by the Eley–Rideal mechanism.
Highlights
Tianliang LuThe production of net-zero fuels has taken on intense focus in recent years as the world works to produce substitutes for hydrocarbon fuels, where their combustion emissions contribute to ongoing climate change
While there are a variety of fuels to consider, they are generally either zero-emission fuels, or are net-zero emission fuels as may be the cases in biodiesel production
The values of the parameters were estimated using Non-Linear Regression Software (NLREG) and MATLAB 2017a
Summary
The production of net-zero fuels has taken on intense focus in recent years as the world works to produce substitutes for hydrocarbon fuels, where their combustion emissions contribute to ongoing climate change. While there are a variety of fuels to consider, they are generally either zero-emission fuels (as in the case of hydrogen, which produces water vapour when combusted), or are net-zero emission fuels as may be the cases in biodiesel production (where the inputs may themselves be derived from plant-based wastes and feedstocks). Production of biodiesel in particular is an interesting net-zero fuel, since its application areas (e.g., heavy-duty construction and agricultural equipment, remote location baseload and on-demand power generation, etc.) are challenging to decarbonize through either electrification or hydrogen fuel vectors. With biodiesel production expected to total 46 billion liters per year from 2023 to 2025 [2], the Received: 29 December 2021
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