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Nanoarray-Based Monolithic Adsorbers for SO2 Removal

  • Special Issue: 2019 CLEERS October 17 - 19, Ann Arbor, MI, USA
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Abstract

Nanoarray-based monolithic catalysts have been developed for various applications, including CO oxidation, hydrocarbon combustion, lean NOx trapping, and low-pressure CO2 hydrogenation. In this work, SO2 adsorption properties have been explored and evaluated on the cordierite honeycomb monoliths grown with zinc oxide nanoarray (ZnO), zinc oxide nanoarray washcoated by BaCO3 nanoparticles (ZnO/BaCO3), and manganese oxide nanowire array with cryptomelane structure (MnOx) at a temperature range from 50 to 425 °C. All samples show temperature-dependent SO2 adsorption behaviors. The adsorption results reveal the performance order: MnOx > ZnO/BaCO3 > ZnO, with ~ 90% SO2 adsorbed in MnOx at 425 °C. Washcoated BaCO3 contributes to the improvement of SO2 adsorption in ZnO nanoarray, and the best performance displayed in MnOx may be attributed to their high specific surface area. After regeneration, nanoarrays all exhibit good thermal stability during test-regeneration cycles. No additional phase is formed in regenerated ZnO nanoarrays (ZnO-R), while BaCO3 is converted to BaSO4 in the regenerated ZnO/BaCO3 nanoarrays (ZnO/BaCO3-R), and the sulfur species (possibly MnSO4) and Mn2O3 are found in regenerated MnOx nanoarrays (MnOx-R). It is noted that a small amount of sulfur species (possibly MnSO4) may promote the SO2 adsorption of MnOx-R at a lower temperature, while the formed Mn2O3 contributes to the deactivation of MnOx-R.

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Funding

This work was sponsored by the US DOE Building Technologies Office, with Antonio Bouza as a program manager, the US National Science Foundation, and the University of Connecticut START PPOC Fund. J. Weng was partially supported by the Thermo Fisher Scientific Graduate Fellowship. The microscopy studies were performed using the facilities in the UConn/Thermo Fisher Scientific Center for Advanced Microscopy and Materials Analysis (CAMMA).

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Authors and Affiliations

  1. Nanomaterials Science Laboratory, Department of Materials Science and Engineering & Institute of Materials Science, University of Connecticut, Storrs, CT, 06269-3136, USA

    Junfei Weng & Pu-Xian Gao

  2. Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA

    Zhiming Gao, Josh Pihl, Tim LaClair, Mingkan Zhang, Kyle Gluesenkamp & Ayyoub Momen

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  1. Junfei Weng
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Correspondence to Pu-Xian Gao.

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Weng, J., Gao, PX., Gao, Z. et al. Nanoarray-Based Monolithic Adsorbers for SO2 Removal. Emiss. Control Sci. Technol. 6, 315–323 (2020). https://doi.org/10.1007/s40825-020-00161-3

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  • DOI: https://doi.org/10.1007/s40825-020-00161-3

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