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

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