Title: Manipulating the Geometric and Electronic Structures of Manganese Nitrides for Ammonia Synthesis

Journal Article · · ChemCatChem
 [1];  [1];  [1];  [1];  [2];  [3];  [4]; ORCiD logo [1]
  1. Tim Taylor Department of Chemical Engineering Kansas State University Manhattan KS 66506 USA
  2. State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical Technology Beijing 100029 P.R. China
  3. Department of Chemistry Kansas State University Manhattan KS 66506 USA
  4. Tim Taylor Department of Chemical Engineering Kansas State University Manhattan KS 66506 USA, Voiland School of Chemical Engineering and Bioengineering Washington State University Pullman WA 99164 USA

Abstract Manganese (Mn) nitrides are important nitrogen (N) carriers for small‐scale intermittent ammonia (NH 3 ) synthesis. However, only 3∼8 % of lattice N are converted into NH 3 . In this study, the geometric and electronic structures of well‐defined Mn 4 N and Mn 2 N lattices were altered using transition metal heteroatoms (Cr, Fe, Co, Ni, Mo) to understand the driving force behind lattice N diffusion and extraction. Density Functional Theory (DFT) revealed that the binding of early hydrogenation product (NH) follows a linear relationship with lattice N over a wide range of close‐packed surfaces. But, the binding of NH 2 and NH 3 are more sensitive to the geometric and electronic structures. Further, the chemical bonding can be quantitatively characterized with the covalency derived from Crystal Orbital Hamiltonian Population (COHP). In the Eley Rideal‐Mars van Krevelan pathway, the overall NH 3 formation free energy ( ) and lattice N diffusion barrier ( ) are the respective thermodynamic and kinetic determining factors. Aided by a rate‐determining step (RDS) model, Mn 4 N modified with Fe, Co, Ni single‐atom dopants all show enhanced rates for NH 3 formation.

Sponsoring Organization:
USDOE
OSTI ID:
1615971
Journal Information:
ChemCatChem, Journal Name: ChemCatChem Journal Issue: 8 Vol. 12; ISSN 1867-3880
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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