مقاله A review of selective catalytic reduction of nitrogen oxides with hydrogen and carbon monoxide : تی پی بین

خلاصه مقاله

The selective reduction of NO with hydrogen (H₂-SCR) and CO (CO-SCR) over platinum group metal catalysts in the presence of O₂ is overviewed. In the case of H₂-SCR, Pt and Pd show high activity at low temperatures. The acidity of the support material greatly affects NO reduction activity and selectivity to N₂/N₂O. Although the activity of Ir and Rh for H₂-SCR is low, coexisting SO₂ in the reaction gas considerably promotes NO reduction. The best support for Ir and Rh is SiO₂. Li and Zn additives improve the activity of Ir/SiO₂ and Rh/SiO₂, respectively, by maintaining the active reduced metal state. For CO-SCR, on the other hand, Ir is almost the only active metal species. Coexisting SO₂ is also essential for CO-SCR on Ir/SiO₂ to occur. The role of SO₂ for both H₂-SCR and CO-SCR on Ir/SiO₂ is to keep Ir in the form of the catalytically active Ir metal state. The additions of WO₃ and Nb₂O₅ considerably promote the activity of Ir/SiO₂ for CO-SCR, catalyzing CO-SCR even in the absence of SO₂. Ir metal interacting strongly with W oxide is the active species on WO₃-promoted Ir/SiO₂. Furthermore, the addition of Ba improves the performance of Ir/WO₃/SiO₂catalyst.

نویسندگان

Hideaki Hamada [ Research Center for New Fuels and Vehicle Technology, National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan ]

Masaaki Haneda [ Ceramics Research Laboratory, Nagoya Institute of Technology, 10-6-29 Asahigaoka, Tajimi, Gifu 507-0071, Japan ]

کلمات کلیدی

Nitrogen oxide Selective catalytic reduction Hydrogen Carbon monoxide Platinum Palladium Iridium Rhodium

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2012 Applied Catalysis A: General

The scope of Applied Catalysis A: General includes the following:Scientific understanding of any catalytic phenomenon .Phenomena of relevance to current industrial processes, processes under industrial development or of interest for future commercial applications are particularly welcome. Heterogeneous, homogeneous and biocatalysts are included .Research investigating catalytic actions of heterogeneous, homogeneous, biological and natural systems are especially encouraged. Scientific aspects of preparation, activation, aging, deactivation, rejuvenation, regeneration and start up transient effects of commercially interesting or representative model catalysts. Scientific methods of characterization of catalysts, especially if they are applicable to industrial catalysts .Chemical engineering aspects relevant to an improved understanding of catalytic phenomena or application to catalysis. Results involving a joint approach by chemical engineering and catalytic science are particularly welcome. New catalysts, catalytic reactions, catalytic routes and processes of potential practical interest. Catalysis and catalytic processes for sustainable practices, including sustainable energy supply and consumption processes, and sustainable chemicals production.

حوزه های تحت پوشش : Petrochemical industry , Catalytic Science , chemical scientists in both industrial and academic fields