Synergistic effects of lanthanum ferrite perovskite and hydrogen to promote ammonia production during microalgae catalytic pyrolysis process

Ammonia (NH3) production from nitrogen-enriched renewable resources pyrolysis is a green, clean, and sustainable technology. In this paper, lanthanum ferrite perovskite (LaFeO3) and hydrogen (H2) atmosphere were combined to enhance NH3 production during microalgae pyrolysis. The catalytic pyrolysis of microalgae pyrolysis was carried out in a fixed bed reactor. The results show that the synergistic effects between H2 and LaFeO3 promote the fuel-nitrogen transfer into gas phase, while nitrogen in biochar and bio-oil significantly decreases. H2 and LaFeO3 not only favor the conversion of protein-N to pyridinic-N, pyrrolic-N, and quaternary-N in char, but also accelerate the deamination of amides, pyrroles, and pyridines, thus facilitating the formation of NH3. Pyrolysis temperature plays a considerable role in distribution and conversion of N-species. Increasing temperature increases NH3 and HCN yields, the maximum NH3 yield reaches 47.40 wt% at 800 degrees C. Moreover, LaFeO3 shows considerable stability during 10 cyclic operations.

Automated summary

Ammonia production from nitrogen-enriched renewable resources pyrolysis using lanthanum ferrite perovskite (LaFeO3) and hydrogen (H2) atmosphere shows promising results in enhancing NH3 yields and nitrogen conversion. The synergistic effects between H2 and LaFeO3 facilitate fuel-nitrogen transfer and promote the formation of NH3, with pyrolysis temperature playing a significant role in N-species distribution and conversion. Additionally, LaFeO3 demonstrates considerable stability over multiple cyclic operations.