MOFs-based coating derived Me-ZIF-67@CuOx materials as low-temperature NO-CO catalysts

To improve the denitrification rate of low-temperature NO-CO selective catalytic reduction (SCR), it is urgent to find new carbon-based materials. In this paper, metal-modified Me-ZIF-67@CuOx (Me= Mn, Fe, Al or Zn) were synthesized by colloidal chemical synthesis and encapsulation method at room temperature as catalysts for low-temperature CO-SCR denitrification. It could be seen that Co ions were replaced by the doping metal ions to form different metal-modified Me-ZIF-67, and Me-ZIF-67@CuOx was loaded by Me-ZIF-67 with regular morphology on octahedral copper oxide derived by Cu-MOF. The test results showed that the catalytic abilities on denitrification rate at low temperature were above 90%. In addition, the ratio of Co2+/Co3+ remained a high value in Me-ZIF-67@CuOx, the denitrification performance of Al-ZIF-67@CuOx was greatly improved, and Mn-ZIF-67@CuOx had the best performance in the sulfur resistance test, indicating that the fine denitrification performance and better sulfur resistance were probably due to the Co-active sites in Me-ZIF-67 loaded on CuOx by metal doping.