In Situ Hydrogen Uptake and NOx Adsorption on Bifunctional Heterogeneous Pd/Mn/Ni for a Low Energy Path toward Selective Catalytic Reduction

Facilitating catalyst accessibility of H 2 and NO x at the catalyst surface remains a great challenge in catalytic selective catalytic reduction (SCR). The efficient conversion of NO x into N 2 under mild conditions is an attractive pathway as SCR usually requires high operating temperature which consumes extra operating energy and restricts the possible locations of an SCR device. The H 2 supply concentration of conventional H 2 -SCR is relatively sparse (0.5-2%), which leads to a relatively high operating temperature to activate H. We developed a H 2 -SCR process with the monolithic catalyst which combined with localized rarefied hydrogen enrichment enhanced by porous nickel and adsorption of NO x on Mn oxide with only 0.08, 0.25, and 0.42% palladium can achieve over 80% NO removal efficiency at 120, 100, and 90 °C. Maximizing the role of nickel foam-fixed hydrogen and Mn oxide in combination with NO can provide enriched NO x and H 2 atmosphere for adjustable valence state Pd to yield positive catalytic behavior.