Simple physical mixing of zeolite prevents sulfur deactivation of vanadia catalysts for NOx removal

Inhak Song, Hwangho Lee, Se Won Jeon, Ismail A. M. Ibrahim, Joonwoo Kim, Youngchul Byun, Dong Jun Koh, Jeong Woo Han and Do Heui Kim ()
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Inhak Song: Seoul National University
Hwangho Lee: Seoul National University
Se Won Jeon: Seoul National University
Ismail A. M. Ibrahim: Pohang University of Science and Technology (POSTECH)
Joonwoo Kim: Research Institute of Industrial Science and Technology (RIST)
Youngchul Byun: Research Institute of Industrial Science and Technology (RIST)
Dong Jun Koh: Research Institute of Industrial Science and Technology (RIST)
Jeong Woo Han: Pohang University of Science and Technology (POSTECH)
Do Heui Kim: Seoul National University

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: Abstract NOx abatement has been an indispensable part of environmental catalysis for decades. Selective catalytic reduction with ammonia using V2O5/TiO2 is an important technology for removing NOx emitted from industrial facilities. However, it has been a huge challenge for the catalyst to operate at low temperatures, because ammonium bisulfate (ABS) forms and causes deactivation by blocking the pores of the catalyst. Here, we report that physically mixed H-Y zeolite effectively protects vanadium active sites by trapping ABS in micropores. The mixed catalysts operate stably at a low temperature of 220 °C, which is below the dew point of ABS. The sulfur resistance of this system is fully maintained during repeated aging/regeneration cycles because the trapped ABS easily decomposes at 350 °C. Further investigations reveal that the pore structure and the amount of framework Al determined the trapping ability of various zeolites.

Date: 2021
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DOI: 10.1038/s41467-021-21228-x

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