Thermal Dry Reforming of Bio-Oil Model Compounds.

Area of Science:

• Chemical Engineering
• Catalysis
• Biomass Conversion

Background:

• Biomass pyrolysis produces bio-oils rich in oxygenated compounds.
• Efficient conversion of these compounds is crucial for sustainable energy production.
• Dry reforming with CO2 offers a pathway to valorize these feedstocks.

Purpose of the Study:

• To experimentally investigate the thermal dry reforming of model oxygenated compounds and hydrocarbons.
• To determine the temperature dependence and feedstock effects on dry reforming efficiency.
• To analyze product distribution and hydrogen yield.

Main Methods:

• Experiments conducted in a tubular flow reactor at atmospheric pressure (800-1350 K).
• Model compounds (acetol, furfural, phenol, syringol) and hydrocarbons (methane, propane) used as feeds.
• Online gas-phase product analysis (micro-GC) and liquid characterization (GC-MS, Karl Fischer titration).

Main Results:

• Thermal decomposition dominates at lower temperatures; dry reforming becomes significant above ~1200 K.
• Phenol addition to acetol enhanced hydrogen yield but reduced CO2 conversion.
• Furfural/syringol blend showed persistent thermal decomposition contributions.
• High CO2 conversion (>50%) and hydrogen yields (~100%) achieved at elevated temperatures for specific feeds.

Conclusions:

• Dry reforming is a viable process for oxygenated biomass pyrolysis products at high temperatures.
• Feedstock composition significantly influences reaction pathways and product yields.
• Optimizing temperature and feedstock selection is key for efficient hydrogen and syngas production.