Karlsruhe Institute of Technology, Institute of Catalysis Research and Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen (Germany).
Angew Chem Int Ed Engl. 2015 Feb 23;54(9):2653-5. doi: 10.1002/anie.201410324. Epub 2015 Jan 16.
Planar laser-induced fluorescence (PLIF) enables noninvasive in situ investigations of catalytic flow reactors. The method is based on the selective detection of two-dimensional absolute concentration maps of conversion-relevant species in the surrounding gas phase inside a catalytic channel. Exemplarily, the catalytic reduction of NO with hydrogen (2 NO+5 H2 →2 H2 O+2 NH3 ) is investigated over a Pt/Al2 O3 coated diesel oxidation catalyst by NO PLIF inside an optically accessible channel reactor. Quenching-corrected 2D concentration maps of the NO fluorescence above the catalytic surface are obtained under both, nonreactive and reactive conditions. The impact of varying feed concentration, temperature, and flow velocities on NO concentration profiles are investigated in steady state. The technique presented has a high potential for a better understanding of interactions of mass transfer and surface kinetics in heterogeneously catalyzed gas-phase reactions.
平面激光诱导荧光（PLIF）可实现对催化流动反应器的非侵入式原位研究。该方法基于对催化通道内周围气相中与转化相关的二维绝对浓度图的选择性检测。例如，在光学可及的通道式反应器中，通过 NO PLIF 研究了在涂覆有 Pt/Al2 O3 的柴油氧化催化剂上用氢气（2 NO+5 H2 →2 H2 O+2 NH3）催化还原 NO。在非反应和反应条件下，获得了催化表面上方的 NO 荧光的淬灭校正二维浓度图。在稳态下，研究了进料浓度、温度和流速变化对 NO 浓度分布的影响。所提出的技术在更好地理解多相催化气相反应中质量传递和表面动力学的相互作用方面具有很高的潜力。
