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A Comparative Density Functional Theory Study of Water Gas Shift Over PdZn(111) and NiZn(111)

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Abstract

PdZn catalysts have been proposed as an alternative to Cu low temperature water gas shift (WGS) catalysts due to their similar reactivity but higher thermal stability. Unfortunately, Pd based alloys are likely to be considerably more expensive than Cu catalysts. Therefore, we explore NiZn as a potentially cheaper alternative to PdZn. Both PdZn(111) and NiZn(111) have similar potential energy surfaces for WGS as previous work on Cu(111) suggesting that they may be effective WGS catalysts. However, unlike PdZn (and Cu), the primary mechanism for WGS shifts from the carboxyl mechanism to a redox mechanism over NiZn(111) (although they are similar in magnitude).

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Acknowledgments

We gratefully acknowledge funding for this work from the National Science Foundation (CBET Grant # 0747646). We gratefully acknowledge NCSA for allocation grant TG-CHE080020N which was used to perform most of the calculations described herein.

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Authors and Affiliations

  1. Department of Chemical Engineering, University of Illinois at Chicago, Chicago, IL, 60607, USA

    Haojuan Wei, Carolina Gomez & Randall J. Meyer

Authors
  1. Haojuan Wei
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  2. Carolina Gomez
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  3. Randall J. Meyer
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Corresponding author

Correspondence to Randall J. Meyer.

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Wei, H., Gomez, C. & Meyer, R.J. A Comparative Density Functional Theory Study of Water Gas Shift Over PdZn(111) and NiZn(111). Top Catal 55, 313–321 (2012). https://doi.org/10.1007/s11244-012-9799-x

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