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

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journal contribution
posted on 03.12.2019, 09:29 by Tianying Xie, Wenjun Luo, Zhenhua Zhou, Wei Sun, Qian Wang, Limei Cao, Ji Yang
Facilitating catalyst accessibility of H2 and NOx at the catalyst surface remains a great challenge in catalytic selective catalytic reduction (SCR). The efficient conversion of NOx into N2 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 H2 supply concentration of conventional H2-SCR is relatively sparse (0.5–2%), which leads to a relatively high operating temperature to activate H. We developed a H2-SCR process with the monolithic catalyst which combined with localized rarefied hydrogen enrichment enhanced by porous nickel and adsorption of NOx 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 NOx and H2 atmosphere for adjustable valence state Pd to yield positive catalytic behavior.

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