Synthesis of Co-doped MnO2 catalysts with the assistance of PVP for low-temperature SCR. Issue 23 (23rd October 2020)

• Record Type: Journal Article
• Authors: Jiang, Haoxi; Kong, Debin; Niu, Ying; Wang, Sheng
• Is Part Of: Catalysis science & technology. Volume 10:Issue 23(2020)
• Page Start: 8086
• Page End: 8093
• Publication Date: 2020-10-23
• Subjects: Catalysis -- Periodicals; 541.395
• DOI: 10.1039/d0cy01628d
• Languages: English
• ISSNs: 2044-4753

Abstract

Abstract : An Mn–Co-0.2-PVP catalyst with high low-temperature de-NO X activity and good H2 O and SO2 resistance was obtained. Abstract : MnO2 –CoO X catalysts with different Mn/Co ratios were prepared using polyvinyl pyrrolidone (PVP) as an assistant to control the morphology and exposed crystal faces of composite oxides. The physicochemical properties of the catalysts were systematically characterized and the catalytic activity of NH3 -SCR and resistance to SO2 /H2 O were investigated. It was found that the NO conversion over Mn–Co-0.2-PVP was apparently higher compared with that over Mn–Co- X -PVP ( X = 0.9, 0.8, 0.6, and 0.4). This can be interpreted in terms of exposed crystal surface (110) and enhanced adsorption of NH3 /NO, and better redox performance resulting from higher Co 3+ /Co 2+ ratio. Furthermore, different PVP and HAc additives have different H2 O and SO2 resistance. Mn–Co-0.2-PVP showed good resistance to H2 O and SO2 poisoning owing to having more low-temperature (∼200 °C) NO adsorption sites, which are beneficial to promote the de-NO X reaction and less affected by SO2 .