Waste egg-derived γ-Mo2N catalysts for efficient dehydrogenation of organic solvent and additive-free aqueous formic acid at low temperature

Formic acid (FA) is regarded as a potential liquid organic hydrogen carrier due to its relatively high hydrogen density and stability. It is crucial to explore efficient, stable and recyclable non-precious metal heterogeneous catalysts to achieve efficient and highly selective dehydrogenation of FA. Herein, biomass waste-derived γ-Mo 2 N catalyst is prepared by one-step pyrolysis, which from waste egg liquid by solid reaction with ammonium molybdate (AHM) for addition-free FA dehydrogenation. The results show that the E-Mo 2 N- 0.05 - 750 catalyst produced with a weight ratio of AHM to waste egg of 0.5/10 with the pyrolysis temperature of 750 °C exhibits the best performance. The catalyst achieves a 388.3 mL/g cat. /h gas production rate and the dehydrogenation selectivity over 99% in the additive-free aqueous FA with a high concentration (40 vol.%). Meanwhile, the catalyst demonstrates good stability during five consecutive cycles and the long-term test (45 h).