Effect of hydrocarbon slip on NO removal activity of CuZSM5, FeZSM5 and V2O5/TiO2 catalysts by NH3

Heo, Iljeong; Lee, Youmi; Nam, In−Sik; Choung, Jin Woo; Lee, Jin Ha; Kim, Hong-jip

doi:10.1016/j.micromeso.2010.02.005

Cited by 52 publications

(92 citation statements)

References 29 publications

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“…Recalculation, taking into account the lower space velocity of 100 000 h -1 , of the data of Heo et al [24], gives values of 2.45 for a 2.2 % vanadia on titania catalyst at 375 °C and 2.37 at 500°C. Our catalyst A has about 2 times higher activity.…”

Section: Discussionmentioning

confidence: 95%

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High-temperature and high-concentration SCR of NO with NH3: Application in a CCS process for removal of carbon dioxide

Brandin

Hulteberg

Odenbrand

2012

Chemical Engineering Journal

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Section: Discussionmentioning

confidence: 95%

“…Activation energies were 38.6, 13.2 and 33.4 kJ/mol out of which at least the value for catalyst E is in the diffusion regime. Calculation of data given by Heo et al [24] gives rate constants in the region of 1.94 for 375 °C and 2.93 at 500…”

Section: Discussionmentioning

confidence: 99%

High-temperature and high-concentration SCR of NO with NH3: Application in a CCS process for removal of carbon dioxide

Brandin

Hulteberg

Odenbrand

2012

Chemical Engineering Journal

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“…Unburned hydrocarbons are always present in real exhaust gas. Zeolite SCR catalyst can be deactivated by hydrocarbons as a result of active site poisoning and pore blockage [35][36][37][38][39]. Pore blockage is known to mainly take place on acid sites [35][36][37][38][39].…”

Section: Discussionmentioning

confidence: 99%

The effect of Fe species distribution and acidity of Fe-ZSM-5 on the hydrothermal stability and SO2 and hydrocarbons durability in NH3-SCR reaction

Shi

Xie

2015

Chinese Journal of Catalysis

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Fe-exchanged ZSM-5 catalysts prepared from Na ＋ and H ＋ forms of ZSM-5 were evaluated for the selective catalytic reduction of NOx by NH3 (NH3-SCR). Fe-H-ZSM-5 showed higher SCR activity than Fe-Na-ZSM-5 both when fresh and after hydrothermal aging at 750 °C in 5% H2O/air. The Fe species distribution and acidity of Fe-H-ZSM-5 and Fe-Na-ZSM-5 were found to be different. The dealumination of the zeolite framework of Fe-H-ZSM-5 during hydrothermal aging was found to be more severe compared with that of Fe-Na-ZSM-5. The durability of Fe-H-ZSM-5 and Fe-Na-ZSM-5 in NH3-SCR was compared using SO2 tolerance and hydrocarbon resistance experiments. The effect of water and SO2 on the activity of the two catalysts was similar, such that their activity decreased at low temperatures and increased at high temperatures. Fe-Na-ZSM-5 showed better propene resistance than Fe-H-ZSM-5. The SO2 and propene poisoning of the two Fe-ZSM-5 catalysts were found to be reversible.

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“…Thus, it is very important to understand how the HCs inhibit the activity of Fe-zeolite catalysts for the NH 3 -SCR reaction [53,[60][61][62][63]. The HC poisoning of Fe-based zeolite catalysts is closely related to the dimensional structure of the zeolite supports.…”

Section: Effects Of H 2 O So 2 and Hydrocarbons (Hc) On The Nh 3 -Scmentioning

confidence: 99%

“…The HC poisoning of Fe-based zeolite catalysts is closely related to the dimensional structure of the zeolite supports. For example, on Fe-ZSM-5 and Fe-BEA catalysts with three-dimensional structure, after HC poisoning the NH 3 -SCR activity was obviously decreased, especially at low temperatures, mainly due to carbonaceous deposition resulting in the decline of surface area and pore volume together with suppressed NO oxidation ability for blocked Fe 3+ sites, or the partial reduction of Fe 3+ species to Fe 2+ species by HC, or the competitive adsorption of HC with NH 3 / NO onto the catalyst surface [53,60,61]. The deactivation effect of HC on NH 3 -SCR activity was less on Fe-MOR catalysts with one-dimensional structure due to the difficulty in HC diffusion into the structure, and using this feature Ma et al [62] effectively improved the HC resistance of a modified Fe-BEA monolith catalyst by coating another layer of MOR zeolite on the outer surface.…”

Section: Effects Of H 2 O So 2 and Hydrocarbons (Hc) On The Nh 3 -Scmentioning

confidence: 99%

Emerging Applications of Environmentally Friendly Zeolites in the Selective Catalytic Reduction of Nitrogen Oxides

Xie

Shi

2016

Green Chemistry and Sustainable Technology

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The catalytic removal of nitrogen oxides (NO x ) from diesel exhaust under oxygen-rich conditions remains a major challenge in the field of environmental catalysis, and the selective catalytic reduction of NO x with NH 3 (NH 3 -SCR), especially over zeolite catalysts, is a well-proven technique for the catalytic deNO x process for diesel vehicles. The comprehensive understanding of the structure-activity relationship of zeolite catalysts in the NH 3 -SCR reaction and the elucidation of the detailed reaction mechanism are very important for the practical use of these catalytic materials. In this chapter, using the environmentally friendly Fe-and Cu-based zeolite catalysts (i.e. Fe-ZSM-5, Cu-ZSM-5, Cu-SSZ-13 and Cu-SAPO-34, etc.) as examples, the influence of preparation methods on NH 3 -SCR performance, the role of metal active sites/surface acid sites, the impact of NO 2 and co-existing pollutants, the hydrothermal stability and also the possible SCR reaction pathways over these materials are discussed in detail, which can provide theoretical and empirical guidance for the redesign and activity improvement of these catalysts in their practical applications.

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Effect of hydrocarbon slip on NO removal activity of CuZSM5, FeZSM5 and V2O5/TiO2 catalysts by NH3

Cited by 52 publications

References 29 publications

High-temperature and high-concentration SCR of NO with NH3: Application in a CCS process for removal of carbon dioxide

High-temperature and high-concentration SCR of NO with NH3: Application in a CCS process for removal of carbon dioxide

The effect of Fe species distribution and acidity of Fe-ZSM-5 on the hydrothermal stability and SO2 and hydrocarbons durability in NH3-SCR reaction

Emerging Applications of Environmentally Friendly Zeolites in the Selective Catalytic Reduction of Nitrogen Oxides

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