SO2-tolerant NOx reduction over SO42--coordinated Cu-SAPO-34 catalysts via protecting the reduction and re-oxidation of Cu sites

نویسندگان

چکیده

Selective catalytic reduction of NOx from mobile source over Cu-SAPO-34 catalysts always suffer sulfur poisoning in practical applications. The pore blockage and loss active Cu species after seriously damage the ability catalysts. In this work, we used SO42--coordinated to improve resistance, which can still maintain 90% NO conversion 24 h reaction an SCR feed with high concentration SO2. A series characterization revealed that process CuII being reduced CuI reoxidation is usually inhibited SO2 catalysts, turn leads accumulation ammonium bisulfate (ABS) sulfation sites. directed coordination SO42- on sites catalyst decreases adsorption SO2, hence deposition ABS as well. This carry out a complete cycle under poison resulted well-maintained re-oxidation work paves way for development highly efficient anti-poisoning

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ژورنال

عنوان ژورنال: Chemical Engineering Journal

سال: 2022

ISSN: ['1873-3212', '1385-8947']

DOI: https://doi.org/10.1016/j.cej.2022.137720