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Plasma ammonia synthesis over mesoporous silica SBA-15

Journal Article · · Journal of Physics. D, Applied Physics
 [1];  [2];  [3];  [3];  [3];  [2]
  1. South Dakota School of Mines and Technology, Rapid City, SD (United States); South Dakota School of Mines and Technology
  2. South Dakota School of Mines and Technology, Rapid City, SD (United States)
  3. Colorado School of Mines, Golden, CO (United States)

Herein we demonstrate the synthesis of ammonia via atmospheric DBD plasma discharge over silica. We evaluated the performance of three structural different silicas: non-porous silica, fumed-silica and mesoporous SBA-15 silica. The mesoporous SBA-15 sample resulted in an ammonia synthesis rate per gram of catalyst at least 3 times higher than that of the non-porous and fumed silica when employing a hydrogen rich gas feed. The hierarchical ordered pore size in the mesoporous range of SBA-15 allowed us to observe experimentally, the pore size effect in the plasma discharge. Specifically, the ammonia production is enhanced by the presence of mesopores that can effectively enable the discharge diffusion into the pore as predicted by theoretical calculations. The importance of the porous structure was confirmed by optical emission spectra which indicates a similarity on the relative intensity on the main plasma activated species in the gas phase such as N2+, NH and H_α for the three silicas employed in this work i.e., non-porous, fumed and mesoporous (SBA-15). Furthermore, the remarkable ammonia production when employing the SBA-15 shows that despite the similarities in the gas phase the main differences might be attributed to the diffusion of the plasma discharge into the pores.

Research Organization:
South Dakota School of Mines and Technology, Rapid City, SD (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Grant/Contract Number:
SC0021309
OSTI ID:
1774111
Alternate ID(s):
OSTI ID: 23143419
Journal Information:
Journal of Physics. D, Applied Physics, Journal Name: Journal of Physics. D, Applied Physics Journal Issue: 26 Vol. 54; ISSN 0022-3727
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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