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Kinetic modeling of NH3-selective catalytic reduction (SCR) over a mildly hydrothermally aged commercial Cu-SSZ-13 catalyst
Not Available
Effects of dioxygen pressure on rates of NO[subscript x] selective catalytic reduction with NH[subscript 3] on Cu-CHA zeolites
Abstract not provided
N2-to-NH3 conversion by excess electrons trapped in point vacancies on 5f-element dioxide surfaces
Ammonia (NH 3 ) is one of the basic chemicals in artificial fertilizers and a promising carbon-free energy storage carrier. Its industrial synthesis is typically realized via the Haber−Bosch process using traditional iron-based catalysts. Developing advanced catalysts that can reduce the N 2 activation barrier and make NH 3 synthesis more efficient is a long-term goal in the field. Most heterogeneous catalysts for N 2 -to-NH 3 conversion are multicomponent systems with singly dispersed metal clusters on supporting materials to activate N 2 and H 2 molecules. Herein, we report single-component heterogeneous catalysts based on 5 f actinide dioxide surfaces (ThO 2 and UO 2 ) with oxygen vacancies for N 2 -to-NH 3 conversion. The reaction cycle we propose is enabled by a dual-site mechanism, where N 2 and H 2 can be activated at different vacancy sites on the same surface; NH 3 is subsequently formed by H − migration on the surface via associative pathways. Oxygen vacancies recover to their initial states after the release of two molecules of NH 3 , making it possible for the catalytic cycle to continue. Our work demonstrates the catalytic activities of oxygen vacancies on 5 f actinide dioxide surfaces for N 2 activation, which may inspire the search for highly efficient, single-component catalysts that are easy to synthesize and control for NH 3 conversion.
Mass Spectrometric Investigation of the Reactions of O-atoms with H2 and NH3
Mass spectrometric analysis of oxygen atom reaction with hydrogen and ammonia
On the solubility of potassium ozonide in liquefied ammonia nh3 - ko3 system o rast- vorimosti ozonida kaliya v szhizhennom ammi- ake
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Neutral density measurements in an NH3 MPD arc Final report, 22 Jul. 1968 - 31 Dec. 1969
Applicability of vacuum ultraviolet spectrometry to detecting neutral atom and molecule constituents in exhaust streams
Comparison of numerical capture cross sections with experimental reaction cross sections for NH3/PLUS/ plus NH3
Comparative numerical capture and experimental reaction cross sections for ion-molecule ammonia
Further investigations of NH3 inversion radiation
Ammonia inversion radiation at 1.25 cm in direction of three galactic center sources, setting upper limits on densities in other areas
Comparison of numerical capture cross sections with experimental reaction cross sections for NH3/plus/ plus NH3
Ammonia-parent ion reaction at low energies, comparing numerical and experimental capture cross sections
Ion dipole capture cross sections at low ion and rotational energies - Comparison of integrated capture cross sections with reaction cross sections for NH3 and H2O parent-ion collisions.
The numerical capture cross section is calculated from the capture ratio, defined as the fraction of trajectories reaching a prescribed minimum separation of 3 A. The calculated capture cross sections for a rotational temperature of 77 K suggest large reaction cross sections in 80 K experiments for the large dipole-moment target, methyl cyanide.