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Bimetallic AuPd@CeO2 Nanoparticles Supported on Potassium Titanate Nanobelts: A Highly Efficient Catalyst for the Reduction of NO with CO

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Abstract

A nanocomposite consisting of bimetallic AuPd nanoparticles, which were modified with CeO2 (AuPd@CeO2), and deposited on potassium titanate nanobelts (KTN) as support, is shown to exhibit outstanding catalytic performance in the selective catalytic reduction of NO with CO. Transmission electron microscopy and energy dispersive X-Ray elemental mapping indicated that the AuPd nanoparticles surrounded by CeO2 were well-mixed forming an alloy. The potassium titanate support consisted of 1–3 µm long and 8–14 nm wide nanobelts. The AuPd@CeO2/KTN catalyst showed full NO conversion at 100 % selectivity to N2 at a gas-hourly space velocity (GHSV) of 15,000 h−1 and 200 °C. The outstanding performance of the AuPd@CeO2/KNT catalyst is attributed to favorable synergies between its components. Corresponding monometallic Au catalysts supported on KTN (Au@CeO2/KNT), as well as bimetallic AuPd supported on TiO2 (AuPd@CeO2/TiO2), showed inferior catalytic performance, indicating the absence of a beneficial synergy between the different components. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) combined with modulation excitation spectroscopy (MES) proved that alloying of Au with Pd enhances the ability to adsorb CO and NO on the surface in an on-top configuration and that the deposition of the bimetallic AuPd nanoparticles on KTN facilitates the crucial formation of isocyanate (-NCO) species, resulting in high conversion and selectivity.

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Acknowledgements

Dr. Yan Xie is acknowledged for TEM and XPS measurements. This work was financially supported by the Natural Science Foundation of China (NSFC) (No. 21377017), the start-up grant from Dalian University of Technology (Nos. DUT13RC(03)04 and DUT13RC(3)26), the National Thousand Talents Program of China and the Fundamental Research Funds for the Central Universities of China.

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Author notes

  1. Xianwei Wang

    Present address: Department of Physical Chemistry, University of Geneva, CH-1211, Geneva 4, Switzerland

Authors and Affiliations

  1. Key Laboratory of Industrial Ecology and Environmental Engineering, School of Environmental Science and Technology, Dalian University of Technology, Dalian, 116024, China

    Xianwei Wang

  2. Institute of Materials and Process Engineering (IMPE), Zurich University of Applied Sciences (ZHAW), Technikumstrasse 9, CH-8400, Winterthur, Switzerland

    Nobutaka Maeda & Daniel M. Meier

  3. Department of Chemistry and Applied Biosciences, Institute for Chemical and Bioengineering, ETH Zurich, Hönggerberg, HCI, CH-8093, Zurich, Switzerland

    Alfons Baiker

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  1. Xianwei Wang
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  2. Nobutaka Maeda
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  4. Alfons Baiker
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Correspondence to Nobutaka Maeda or Alfons Baiker.

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Wang, X., Maeda, N., Meier, D.M. et al. Bimetallic AuPd@CeO2 Nanoparticles Supported on Potassium Titanate Nanobelts: A Highly Efficient Catalyst for the Reduction of NO with CO. Catal Lett 151, 2483–2491 (2021). https://doi.org/10.1007/s10562-020-03502-7

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  • DOI: https://doi.org/10.1007/s10562-020-03502-7

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