Fluorescence imaging technique applied to high-temperature catalysis

Frederik Gudmundson; F. Behrendt; Arne Rosen

doi:10.1117/12.221482

25 September 1995 Fluorescence imaging technique applied to high-temperature catalysis

Frederik Gudmundson, F. Behrendt, Arne Rosen

Proceedings Volume 2547, Laser Techniques for Surface Science II; (1995) https://doi.org/10.1117/12.221482
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

We have used the planar laser induced fluorescence, PLIF, technique to study the OH concentration distributions outside a catalytic surface at different pressures and gas compositions. In the experiments a flow of hydrogen and oxygen at a total pressure of 0.2 - 1 Torr is directed towards a platinum foil, which is resistively heated to 1300 K. OH radicals are formed on the catalyst surface as an intermediate in the 2H₂ + O₂ yields 2H₂O reaction. A small fraction of the OH radicals desorb to the gas phase, instead of reacting with adsorbed H atoms to form H₂O. These desorbed radicals are detected with the PLIF technique in a region 1 - 6 mm from the surface, i.e., spatial distribution patterns are obtained. The recorded fluorescence patterns are corrected for laser beam intensity variations. The corrected patterns are used to determine the relative OH concentration distributions outside the surface at different pressures and gas compositions. The recorded fluorescence patterns from different transitions are used to determine rotational temperature distributions. The measurements are compared with results from a computer model that simulates the laminar stagnation point flow of hydrogen and oxygen on the catalyst. The model includes both gas phase reactions and surface reactions. The relative amount of OH radicals as function of the distance from the platinum foil and gas temperatures with the simulated temperature profiles we found that the gas phase temperature can not be calculated assuming continuity in the temperature over the gas-surface boundary.

Citation Download Citation

Frederik Gudmundson, F. Behrendt, and Arne Rosen "Fluorescence imaging technique applied to high-temperature catalysis", Proc. SPIE 2547, Laser Techniques for Surface Science II, (25 September 1995); https://doi.org/10.1117/12.221482

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
8 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Temperature metrology

Platinum

Luminescence

Laser induced fluorescence

Catalysis

Hydrogen

Computer simulations

Show All Keywords

Keywords/Phrases

Search In:

Publication Years