Co‐Ni/MOF‐74 catalyst packed‐bed DBD plasma for ammonia synthesis

Abstract

Nonthermal plasma (NTP) provides a potential and sustainable route for the synthesis of ammonia. In this work, a Co–Ni/MOF‐74 catalyst was developed to synthesize ammonia from N2 and H2 in a dielectric barrier discharge (DBD) plasma at low temperature and atmospheric pressure. Co–Ni/MOF‐74 showed the highest ammonia synthesis rate up to 2608.70 μmol g−1 h−1 at 200°C, with V(N2):V(H2) ratio of 1:1 and specific energy input of 33.27 kJ L−1. The catalytic activity was increased by 19.57% for Co–Ni/MCM‐41 and 375% for Co‐Ni/Al2O3, respectively. It was observed that the average electric field (E) and power efficiency were enhanced while adding Co–Ni/MOF‐74 to the reaction system.

Dielectric barrier discharge plasma-assisted catalytic ammonia synthesis: synergistic effect of Ni-MOF-74 catalyst and nanosecond pulsed plasma

“…It was lower than the values reported by Peng et al [46], however, they used larger gas flow rates in their work, which may have resulted in lower feedstock utilization. Patil et al [47] synthesized ammonia in a microsecond pulsed DBD plasma using a BaTiO 3 catalyst with a maximum energy efficiency of 0.34 g•kWh −1 at a specific energy input of 2.13 kJ•L −1 , which is significantly lower than the present study, mainly due to the higher specific surface area and catalytic activity of the Ni-MOF-74 catalyst than BaTiO 3 . Liu et al [48] efficiency of 0.72 g•kWh −1 , and Shah et al [34] achieved a maximum energy efficiency of 0.23 g•kWh −1 of , all of which are significantly lower than the present study.…”

Unlocking Efficient Synergistic Plasma-Catalyst Ammonia Synthesis: System Optimization and Catalyst Support Screening

“…At different discharge powers, the 5 cm electrode configuration had the highest concentration of ammonia synthesis. This indicates that this configuration’s discharge and catalytic reaction processes may have reached an appropriate matching state, ensuring the reactants’ thorough activation and reaction . The difference in performance is particularly noticeable when the discharge power is 15 W. The 5 cm electrode configuration synthesized 4755 ppm of ammonia, significantly higher than the ammonia-producing capacity of the 7 cm (3634 ppm) and 9 cm (3575 ppm) electrode configurations.…”

“…This indicates that this configuration's discharge and catalytic reaction processes may have reached an appropriate matching state, ensuring the reactants' thorough activation and reaction. 27 The difference in performance is particularly noticeable when the discharge power is 15 W. The 5 cm electrode configuration synthesized 4755 ppm of ammonia, significantly higher than the ammonia-producing capacity of the 7 cm (3634 ppm) and 9 cm (3575 ppm) electrode configurations. The observed phenomenon may be attributed to reduced discharge power per unit discharge volume resulting from increased electrode length.…”

Ammonia synthesis by nonthermal plasma catalysis: a review on recent research progress

“…Conventional thermal catalytic ammonia synthesis commonly employs the stoichiometric N 2 /H 2 ratio (1:3), whilst under NTP conditions relevant studies showed that the N 2 -rich environment is beneficial to promote the ammonia production rate [27,39,54,57,[70][71][72]. For example, Patil et al conducted a comparative investigation of the N 2 /H 2 ratio on NH 3 formation over various metals supported on Al 2 O 3 , showing the optimal N 2 /H 2 ratio in the NTP-catalysis was either 1 or 2 depending the type of metals [27].…”