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1 edition of Low-temperature CO-oxidation catalysts for long-life CO₂ lasers found in the catalog.

Low-temperature CO-oxidation catalysts for long-life CO₂ lasers

Low-temperature CO-oxidation catalysts for long-life CO₂ lasers

collected papers from an international conference sponsored by the National Aeronautics and Space Administration, Washington, D.C., and the Royal Signals and Radar Establishment, Malvern, United Kingdom, and held at Langley Research Center, Hampton, Virginia, October 17-19, 1989

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Published by National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division in Washington, D.C .
Written in English

    Subjects:
  • Carbon dioxide lasers -- Congresses.,
  • Catalysts -- Congresses.,
  • Oxidation -- Congresses.

  • Edition Notes

    Statementedited by David R. Schryer, Gar B. Hoflund.
    SeriesNASA conference publication ;, 3076
    ContributionsSchryer, David R., Hoflund, Gar B., United States. National Aeronautics and Space Administration., Royal Signals and Radar Establishment (Great Britain), International Conference on CO-Oxidation Catalysts for Long-Life CO₂ Lasers (1989 : NASA Langley Research Center)
    Classifications
    LC ClassificationsTA1695 .L69 1990
    The Physical Object
    Paginationxv, 409 p. :
    Number of Pages409
    ID Numbers
    Open LibraryOL1986133M
    LC Control Number90601452

    For all discussed above, the main goal of this work is the development of an efficient series of gold catalysts for low temperature CO oxidation using CeO 2-FeO x mixed oxides supported on Al 2 O 3 as a support. The evaluation of the catalytic performance induced by the presence of certain amounts of iron in the catalyst formulation is another. Amplification. The active laser medium (laser gain/amplification medium) is a gas discharge which is air- or water-cooled, depending on the power being applied. The filling gas within the discharge tube consists of around 10–20% carbon dioxide (CO 2), around 10–20% nitrogen (N 2), a few percent hydrogen (H 2) and/or xenon (Xe) (usually only used in a sealed tube), and the remainder of the.

    temperatures on commercial catalysts. Purpose of Work/Barriers Develop low-temperature HC & CO oxidation catalysts to enable HCCI application HCCI shows promise for achieving increased fuel efficiency and meeting future HD NO x limits. Barriers include: zHigh hydrocarbon (up to ppm C 1) and CO emissions (%). These high-surface area nanosized catalysts were found to be very active for CO oxidation reaction; the lowest T90 was 80 °C, achieved over a % CuO content catalyst.

    the challenge of designing a CO oxidation catalyst for pulsed CO, lasers. CO oxidation catalysts have a long history of application, of course, so it is instructive to first consider the special requirements of the laser application and then to compare them to the characteristics of existing processes that utilize CO oxidation catalysts. Develop low-temperature HC & CO oxidation catalysts to enable HCCI application. CO Conversion. 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% % 50 Catalyst Face Temperature (deg C) Conversion % Oxicat A Oxicat B Oxicat C Oxicat D Oxicat E. Target. Specifications to vendors: HC oxidation: 90% at o. C and higher. HC light.


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Low-temperature CO-oxidation catalysts for long-life CO₂ lasers Download PDF EPUB FB2

Get this from a library. Low-temperature CO-oxidation catalysts for long-life CO₂ lasers: collected papers from an international conference sponsored by the National Aeronautics and Space Administration, Washington, D.C., and the Royal Signals and Radar Establishment, Malvern, United Kingdom, and held at Langley Research Center, Hampton, Low-temperature CO-oxidation catalysts for long-life CO₂ lasers book, October Low-Temperature CO-Oxidation Catalysts for Long-Life CO2 Lasers.

United States. National Aeronautics and Space Administration. - Carbon dioxide lasers - pages. 0 Reviews. Preview this book. Overview Low-Temperature Oxidation Catalysts for HCCI Emissions Control HCCI shows promise for meeting HD NO x limits (Duffy et al., DEER ) z One of the major hurdles with implementation is high hydrocarbon (up to ppm C 1) and CO emissions (%) z Low exhaust temperatures are below typical light-off for standard oxidation catalystsFile Size: KB.

Low-temperature co-oxidation catalysts for long-life CO₂ lasers: collected papers from an international conference sponsored by the National Aeronautics and Space Administration, Washington, D.C., and the Royal Signals and Radar Establishment, Malvern, United Kingdom, and held at Langley Research Center Hampton, Virginia October/.

1. Introduction. The catalytic oxidation of CO at low temperature has attracted great attention because of its wide applications in exhaust abatement for CO 2 lasers, trace CO removal, the automotive emission control, and CO preferential oxidation for proton exchange membrane fuel cells.

Precious metals such as Pd, Pt and Au, have been demonstrated to be very effective in CO oxidation Cited by:   1.

Introduction. The catalytic oxidation of CO at low temperature has attracted considerable attention because of its wide applications in exhaust abatement for CO 2 lasers, trace CO removal in enclosed atmospheres, automotive emission control, and CO preferential oxidation for proton exchange membrane fuel cells.

Catalysts containing noble metals proved to be very effective for CO oxidation. correlation of the Ni–Co catalysts for low temperature CO oxidation; (3) and analysing the interaction of CO or/and O 2 over typical samples by in situ DRIFTS, to reveal a possible reaction mechanism for CO oxidation.

Experimental Catalyst preparation The Ni–Co composite oxides and the NiO and Co. Aside from their high cost, PGM catalysts struggle with CO oxidation at low temperatures (catalyst composed of copper oxide, cobalt oxide, and ceria (dubbed CCC) that outperforms synthesized and commercial PGM catalysts for CO oxidation in.

The Co 3 O 4 nanorods were tested for CO oxidation at –77 °C under a reaction stream with a gas composition of vol.% CO/ vol.% O 2 /He.

They showed % CO conversion to CO 2. Researchers have assigned the effectiveness of Co 3 O 4 in low-temperature CO catalytic oxidation to the fact that Co 3 O 4 is the most active transition metal oxide for CO oxidation, as well as its possession of a unique Co 3+ /Co 2+ redox couple.

2 For example, Wang et al. 12 obtained Co 3 O 4 via a controlled liquid precipitation process. Family of CO and CO 2 Lasers, with power from Watts to Kilowatts for processing materials ranging from paper to metal. Coherent offers the broadest portfolio of completely sealed low-power CO and CO 2 laser products in the market.

This family of sealed lasers is available in a wide range of models, with output powers ranging from 20W to W. Despite enormous breakthroughs in our understanding of the reaction mechanism of the low-temperature CO oxidation on gold catalysts, in particular on Au/TiO2 and down to temperatures as low as − °C, there are still many contradictory proposals about the dominant reaction pathway.

In this work, we will demonstrate that these discrepancies often originate from the rather different reaction. Low-temperature CO oxidation has been extensively studied because it plays an important role in gas purification in CO 2 lasers, CO gas sensors, air purification devices, and removing trace quantity of CO from ambient air in enclosed atmospheres such as submarines and aircrafts [1–3].

When gold is deposited as nanoparticles on metal oxides. A compact low‐power long‐life sealed‐off cw CO2 laser has been developed by incorporating a catalyst‐coated outer jacket that helps to regenerate CO2 from the dissociation products formed during discharge.

Maintaining the catalyst at an optimized temperature prevented CO2 adsorption in its bulk and resulted in the required level of CO oxidation activity. @article{osti_, title = {Low-temperature CO oxidation over a ternary oxide catalyst with high resistance to hydrocarbon inhibition}, author = {Binder, Andrew J.

and Toops, Todd J. and Unocic, Raymond R. and Parks, II, James E. and Dai, Sheng}, abstractNote = {Platinum group metal (PGM) catalysts are the current standard for control of pollutants in automotive exhaust streams.

Bing Han, Tianbo Li, Junying Zhang, Chaobin Zeng, Hiroaki Matsumoto, Yang Su, Botao Qiao, Tao Zhang, A highly active Rh 1 /CeO 2 single-atom catalyst for low-temperature CO oxidation, Chemical Communications, /D0CCE, ().

Boronin, A. et al. Investigation of palladium interaction with cerium oxide and its state in catalysts for low-temperature CO oxidation. Catal. Today– (). The development of active and stable catalysts without noble metals for low-temperature CO oxidation under an ambient atmosphere remains a significant challenge.

Here we report that tricobalt tetraoxide nanorods not only catalyse CO oxidation at temperatures as low as –77 °C but also remain stable in a moist stream of normal feed gas. Low-temperature co-oxidation catalysts for long-life CO₂ lasers: collected papers from an international conference sponsored by the National Aeronautics and Space Administration, Washington, D.C., and the Royal Signals and Radar Establishment, Malvern, United Kingdom, and held at Langley Research Center Hampton, Virginia OctoberTypical conversion efficiencies for carbon monoxide and various hydrocarbons (butane, propane, and methane) in the Nett ® oxidation catalyst are shown in Figure 8.

Catalyst activity increases with temperature. A minimum exhaust temperature of about °C is necessary for the catalyst to "light-off". The Cu-Ce oxides system has been found to be effective catalyst for low temperature CO oxidation because of the strong synergistic effect between copper and ceria [ 11 ].

Astudillo et al. support. Via a comprehensive time-resolved operando-DRIFTS study of the evolutions of various surface species on Au/CeO2 catalysts with Au particle sizes ranging from ± to ± nm during CO oxidation at room temperature, we have successfully demonstrated size-dependent reaction pathways and their contributions to the catalytic activity.Long-life, closed-cycle operation of pulsed CO 2 lasers requires catalytic CO-0 2 recombination both to rem which is formed by discharge-induced CO2 decomposition, and to regenerate CO 2.

Platinum metal on a tin-oxide substrate (Pt/Sn02) has been found to be an effective catalyst for such recombination in the desired temperature range of 25°C to °C.