You are being redirected because this document is part of your ASTM Compass® subscription.
    This document is part of your ASTM Compass® subscription.

    If you are an ASTM Compass Subscriber and this document is part of your subscription, you can access it for free at ASTM Compass
    Volume 8, Issue 3 (September 2019)

    Special Issue Paper

    A Comparative Study of Carbon Supports for Pd/Au Nanoparticle-Based Catalysts

    (Received 7 September 2018; accepted 6 November 2018)

    Published Online: 10 May 2019

    CODEN: MPCACD

      Format Pages Price  
    PDF (921.29 KB) 11 $25   ADD TO CART

    Cite this document

    X Add email address send
    X
      .RIS For RefWorks, EndNote, ProCite, Reference Manager, Zoteo, and many others.   .DOCX For Microsoft Word



    Abstract

    Carbon materials are promising supports for heterogeneous catalysis compared to oxide supports, such as titania, alumina, mesoporous silica, and hydrotalcite, because of their stability and relative chemical inertness. Additionally, the unique surface structures of carbon supports help control the growth, aggregation, and uniformity of the catalytic nanoparticles (NPs) hybridized with them. However, the effect of carbon supports on these NP catalysts is not well understood, affecting the optimization of this type of catalysts. In this study, palladium-gold (Pd/Au) carbon composites were systematically investigated, and the most favorable carbon support was identified. Carbon-supported Pd/Au NPs have often been favored for catalytic hydrodehalogenation (HDH) of volatile organic compounds. Hence, this study uses trichloroethylene (TCE) as model contaminant to investigate the effects of four types of carbon supports—granular activated carbon (GAC), carbon black, graphite, and graphite nanoplates—on the formation of catalytic Pd/Au NPs and their correlations to HDH reactions. Each support was chosen based on a desirable quality: GAC has a large surface area and substantial absorption capabilities, carbon black has a high surface-area-to-volume ratio and good chemical stability, graphite is the most stable form of carbon with a layered structure and thermal stability, and graphite nanoplates have large surface areas with structural stability. Characterizations of these Pd/Au-carbon composites show different NP sizes on each support, with GAC and carbon black generating smaller NPs. The HDH results suggest GAC, carbon black, and graphite nanoplates composites generate fast reaction rates. However, when comparing particle size and surface area, Pd/Au-GAC composites generate the fastest TCE degradation, providing a bigger boost to HDH rates than other types of carbon supports. More advantageously, GAC is widely available commercially with relatively low cost, and its high surface area is enabled by its high porosity, making GAC the preferred carbon support for Pd/Au NP catalyst mass production.

    Author Information:

    Meduri, Kavita
    Department of Mechanical and Materials Engineering, Portland State University, Portland, OR

    Rahimian, Arianna
    Department of Mechanical and Materials Engineering, Portland State University, Portland, OR

    Emory University, Atlanta, GA

    Humbert, Riley Ann
    Department of Mechanical and Materials Engineering, Portland State University, Portland, OR

    Oregon State University, Corvallis, OR

    O’Brien Johnson, Graham
    School of Public Health, Oregon Health and Science University, Portland, OR

    Tratnyek, Paul G.
    School of Public Health, Oregon Health and Science University, Portland, OR

    Jiao, Jun
    Department of Physics, Department of Mechanical and Materials Engineering, Portland State University, Portland, OR


    Stock #: MPC20180147

    ISSN:2379-1365

    DOI: 10.1520/MPC20180147

    Author
    Title A Comparative Study of Carbon Supports for Pd/Au Nanoparticle-Based Catalysts
    Symposium ,
    Committee D30