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Mechanism of NH3 and HCN migration during high-temperature pyrolysis of microalgae-derived nitrogen-containing model compounds catalyzed by CaO
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DOI：10.1016/j.jiec.2026.03.027.png)
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Abstract
En 中文
Under China’s dual-carbon goals, microalgae are promising carbon-capture fuels that can directly fix CO2 from flue gas and achieve near-zero carbon emissions through co-firing. However, their high nitrogen content promotes NOx formation during combustion, limiting clean utilization. This study investigates how CaO, a key coal ash component, influences the migration of NH3 and HCN during high-temperature pyrolysis at 800–1500 °C using microalgae-derived nitrogen-containing model compounds: glycine, glutamic acid, and phenylalanine. Results indicate that CaO promotes NH3 release from glycine at 800 °C but inhibits it between 900 and 1500 °C. For glutamic acid and phenylalanine, CaO enhances NH3 release across the whole temperature range, with the promoting effect strengthening for glutamic acid but weakening for phenylalanine as temperature rises. In contrast, CaO consistently suppresses HCN formation from all three compounds, with inhibition intensifying for glutamic acid yet decreasing for glycine and phenylalanine at higher temperatures. XRD and thermodynamic analyses reveal that CaO reacts with nitrogenous species to form CaCxNy intermediates, which participate in a cyclic conversion with CaC2 and catalyze the directed transformation of nitrogen-containing intermediates into harmless N2. This study elucidates the mechanism by which CaO catalyzes the conversion of fuel nitrogen to N2, providing theoretical support for low-NOx control strategies in microalgae co-firing.
Keywords:
CaO
NH3
HCN
microalgae
pyrolysis
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