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Methane Combustion over Pd Catalysts Loaded on Medium and Large Pore Zeolites

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Abstract

Methane combustion was conducted over Pd catalysts supported on medium (ZSM-5, ferrierite, TNU-9, TNU-10) and large (USY, mordenite, beta) pore zeolites. Among the catalysts studied here, Pd/H-TNU-10 exhibited the highest combustion activity, together with excellent durability in the presence of water vapor. A combination of TEM and Pd K-edge XAFS measurements reveals the formation of highly dispersed PdO particles within the TNU-10 pores. This is also the case of Pd/H-ferrierite, while frequently there are large particles (60–100 Å) on its outer surface. In contrast, most of PdO on zeolites other than these two medium pore materials were found to exist as aggregated particles (>50 Å) on their outer crystallite surface. It appears that zeolite structures with intersecting 10- and 8-ring pores may be better supports for stabilizing nanometric PdO particles than those with the uniform 10-ring size or with the 12-ring pore system.

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Acknowledgments

Funding for this work was provided by the Korea Science and Engineering Foundation through the National Research Lab program (R0A-2007-000-20050-0) and the Mid-Term Technology Research Project from MICIE and Heesung Catalysts Corporation. We thank Dr. M.-Y. Kim (Chonnam National University) for collecting the XAFS data.

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Authors and Affiliations

  1. Department of Chemical Engineering, Chungbuk National University, Chungbuk, 361-763, South Korea

    Jung-Hyun Park, Bokie Kim & Chae-Ho Shin

  2. School of Applied Chemical Engineering and Research, Institute for Catalysis, Chonnam National University, Kwangju, 500-757, South Korea

    Gon Seo

  3. Department of Chemical Engineering and School of Environmental Science and Engineering, POSTECH, Pohang, 790-784, South Korea

    Seok Han Kim & Suk Bong Hong

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  1. Jung-Hyun Park
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  2. Bokie Kim
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Correspondence to Chae-Ho Shin or Suk Bong Hong.

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Park, JH., Kim, B., Shin, CH. et al. Methane Combustion over Pd Catalysts Loaded on Medium and Large Pore Zeolites. Top Catal 52, 27–34 (2009). https://doi.org/10.1007/s11244-008-9135-7

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