A stable Cu-polyatomic-cluster catalyst: Critical for methanol reforming deNOx at mild temperature

Abstract

The practical application of traditional H2-SCR is hindered by its rare hydrogen supply (0.5-2%) and the safety risk of hydrogen transportation and storage. Therefore, this paper proposes a new process to reduce the hydrogen utilization threshold by coupling low-temperature inline hydrogen production and hydrogen deNOx. We synthesized a bifunctional catalyst: Cux/C-MnPdOy@Ni, which could achieve inline hydrogen production above uniformed-dispersion Cu-polyatomic-cluster Cux/C center and coupled with hydrogen deNOx over MnPdOy center. Online-GC monitored the generation of H2 during the process, which confirmed the coupling reaction's feasibility. The candidate Cu800/C-MnPdOy@Ni can maintain over 90% deNOx efficiency at 120 °C under GHSV = 22000 h−1 + water-alcohol ratio (ω) = 1.3 + 800 ppm NO and possessed good water resistance. Through the characterization of morphology and valence state of elements, uniform dispersion of the Cu-polyatomic clusters could directly visualize, which solved the defect of activity site agglomeration; therefore, a more low-temperature hydrogen-producing catalyst was obtained. This article provides a safer H2-SCR process on a coupling catalyst that simultaneously produces in-situ hydrogen and reduces NOx.