Topic
Selective catalytic reduction
About: Selective catalytic reduction is a research topic. Over the lifetime, 10502 publications have been published within this topic receiving 226291 citations.
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TL;DR: In this article, the chemical and mechanistic aspects of the selective catalytic reduction (SCR) of NO by ammonia and by methane have been investigated, and the classical NH 3 -SCR process, operating near 600k over vanadia-titania-based catalysts, is shown to imply the activation of NO x in the form of an adsorbed oxidized species, that reacts with the reductant, CH 4, from the gas phase or activation into the zeolite channels.
164 citations
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TL;DR: In this article, a Fe-Mn−Ce/γ-Al2O3 granular catalyst was synthesized using the sol-gel method and then developed in the low temperature selective catalytic reduction (SCR) of NO with NH3.
164 citations
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20 Dec 2002TL;DR: In this paper, a method of selectively catalyzing the reduction of NO x in an exhaust gas flowing in an internal combustion engine comprising a filter for particulate matter comprising a catalyst capable of selectively catalysing the reduction with a reducing agent was proposed.
Abstract: A method of selectively catalysing the reduction of NO x in an exhaust gas flowing in an exhaust system of an internal combustion engine comprising a filter ( 40 ) for particulate matter comprising a catalyst capable of selectively catalysing the reduction of NO x with a reducing agent, which method comprising introducing a reducing agent, or a precursor thereof, into the exhaust gas and contacting the resulting gas with the filter ( 40 ).
164 citations
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TL;DR: Improved reactivity of NH4+ with nitrates following the Langmuir-Hinshelwood mechanism and active NH2 species that directly reacted with gaseous NO following the Eley-Rideal mechanism enhanced the NO x reduction efficiency at low temperatures, paving a way for the development of high-performance SO2-tolerant SCR monolith catalysts.
Abstract: Currently, selective catalytic reduction of NO x with NH3 in the presence of SO2 is still challenging at low temperatures (<300 °C). In this study, enhanced NO x reduction was achieved over a SO2-tolerant Fe-based monolith catalyst, which was originally developed through in situ construction of Al2O3 nanoarrays (na-Al2O3) on the monolithic Al-mesh by a steam oxidation method followed by anchoring Fe2O3 and CeO2 onto the na-Al2O3@Al-mesh composite by an impregnation method. The optimum catalyst delivered more than 90% NO conversion and N2 selectivity above 98% within 250-430 °C as well as excellent SO2 tolerance at 270 °C. The strong interaction between Fe2O3 and CeO2 enabled favorable electron transfers from Fe2O3 to CeO2 while generating more oxygen vacancies and active oxygen species, consequently accelerating the redox cycle. The improved reactivity of NH4+ with nitrates following the Langmuir-Hinshelwood mechanism and active NH2 species that directly reacted with gaseous NO following the Eley-Rideal mechanism enhanced the NO x reduction efficiency at low temperatures. The preferential sulfation of CeO2 alleviated the sulfation of Fe2O3 while maintaining the high reactivities of NH4+ and NH2 species. Especially, the SCR reaction following the Eley-Rideal mechanism largely improved the SO2 tolerance because NO does not need to compete with sulfates to adsorb on the catalyst surface as nitrates or nitrites. This work paves a way for the development of high-performance SO2-tolerant SCR monolith catalysts.
163 citations
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TL;DR: In this article, the selective catalytic reduction (SCR) of NOx with NH3 over environmental-friendly iron titanate catalyst (FeTiOx) was investigated in detail.
163 citations