Effect of Si islands on low-temperature hydrothermal stability of Cu/SAPO-34 catalyst for NH 3-SCR

摘要

Highlights?The correlation between Si islands and low-temperature hydrothermal stability of Cu/SAPO-34 was firstly researched.?The number of structure defect increased with more content of Si islands in Cu/SAPO-34.?Cu/SAPO-34 sample with less Si islands experienced less damage of structure and kept NH3-SCR activity better after low-temperature hydrothermal treatment.?Isolated Cu+/Cu2+species were more stable in Cu/SAPO-34 sample with less Si islands.AbstractThe effect of the Si islands on the stability of Cu/SAPO-34 as a selective catalytic reduction (SCR) catalyst during low-temperature hydrothermal treatment (LTH treatment) was experimentally investigated. Cu/TEAOH (high Si islands) and Cu/TEA catalyst (low Si islands) were synthesized and then aged at 70?