Nonthermal Plasma Catalytic Ammonia Synthesis over a Ni Catalyst Supported on MgO/SBA-15

• DOI: 10.1021/acs.iecr.1c04968
• Publication Date: 2022-02-23T19:24:23Z
• Authors: Shuncheng Li; Yan Shao; Huanhao Chen; Xiaolei Fan
• Keywords: Incipient wetness impregnation; Ammonia production; MCM-41

Nonthermal plasma (NTP)-enabled ammonia synthesis has been recently considered a sustainable technique as compared to the Haber–Bosch (HB) process. Herein, we demonstrated NTP catalytic using mesoporous silica (SBA-15)-supported Ni catalysts under ambient conditions. Specifically, two types of MgO-modified SBA-15 were developed (as catalyst support) by in situ doping and incipient wetness impregnation (IWI) methods, respectively. Experimental results that addition Mg via IWI method favored rate The Ni-Mg0.02/SBA-15-IWI exhibited highest energy efficiency value 4.4 mmol h–1 gcat–1 1.05 gNH3 kWh–1, respectively, outperforming Ni/SBA-15 Ni-Mg0.02/SBA-15-In (i.e., method). High-resolution transmission electron microscopy (HRTEM) energy-dispersive system (EDS) mapping analysis showed (on SBA-15) dispersion active sites on surface interaction between support, i.e., uniform distribution nanoparticles 5.1 ± 1.1 nm catalyst, which enhanced performance. Finally, displayed slight decrease from ∼4.42 ∼3.89 over 40 h stream, could be attributed aggregation particles based postreaction HRTEM analysis.