Efforts Toward Unraveling Plasma-Assisted Catalysis: Determination of Kinetics and Molecular Temperatures within N2O Discharges

被引:6
作者
Hanna, Angela R. [1 ]
Fisher, Ellen R. [1 ]
机构
[1] Colorado State Univ, Dept Chem, Ft Collins, CO 80523 USA
基金
美国国家科学基金会;
关键词
plasma-assisted catalysis; nitrogen oxides; zeolites; energy partitioning; plasma kinetics; SELECTIVE ENERGY-TRANSFER; NITROUS-OXIDE N2O; DECOMPOSITION; ADSORPTION; SURFACE; SPECTROSCOPY; PERFORMANCE; CONVERSION; REMOVAL; STREAMS;
D O I
10.1021/acscatal.0c00794
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Plasma-assisted catalysis represents an alternative solution to pollution abatement. To be viable, a thorough understanding of plasma-catalyst synergisms must be gained, specifically establishing links between the gas-phase, gas-surface interface, and resulting material properties. Optical emission spectroscopy provides insights into the impact of Pt and zeolite catalysts on plasma species densities, energetics, reaction kinetics, and plasma-catalyst configurations within N2O plasmas. The role of material structure on gas-phase chemistry is revealed through the use of Pt catalysts with two morphologies and size scaling. The concentration of excited-state NO substantially decreased at high powers with Pt nanopowder or microstructured zeolites. All catalytic materials significantly decreased N-2 vibrational temperatures, with little impact on rotational temperatures. Conversely, Pt materials had a limited effect on vibrational temperatures of NO; however, Pt powder enhanced NO decomposition within a two-stage system over the single-stage system. Material characterization revealed that the plasma effectively poisons Pt materials, resulting in poorer performance.
引用
收藏
页码:6546 / 6560
页数:15
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