The shell DENOX system for low temperature NOx removal

Grift, C.J.G. van der; Woldhuis, A.; Maaskant, Onno

doi:10.1016/0920-5861(95)00204-9

Cited by 33 publications

(15 citation statements)

References 3 publications

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“…Low-temperature NH 3 -SCR catalysts (180-240 • C) are currently used in some industrial applications [11,12]. However, besides the general problems associated with the NH 3 -SCR NO x control technology used in stationary applications [8,9], the main disadvantage of the low-temperature NH 3 -SCR technology is its susceptibility to ammonium bisulphate precipitation when SO x are present in the flue gas stream.…”

Section: Introductionmentioning

confidence: 99%

Industrial NOx control via H2-SCR on a novel supported-Pt nanocatalyst

Olympiou

Efstathiou

2011

Chemical Engineering Journal

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Section: Introductionmentioning

confidence: 99%

Industrial NOx control via H2-SCR on a novel supported-Pt nanocatalyst

Olympiou

Efstathiou

2011

Chemical Engineering Journal

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“…However, this accelerates catalyst deactivation through exposure to high concentrations of SO 2 and particulate matter. Recently, efforts have been made to develop catalysts capable of operating in the low-temperature range of 353−523 K − so that the catalyst bed can be shifted downstream of the desulfurizer and/or particulate control device. More importantly, it will help eliminate the need to reheat the stack gas, resulting in a lower investment and also a thermally more efficient process.…”

Section: Introductionmentioning

confidence: 99%

Manganese Oxide Catalysts Supported on TiO₂, Al₂O₃, and SiO₂: A Comparison for Low-Temperature SCR of NO with NH₃

Smirniotis

Sreekanth

Peña

et al. 2006

Ind. Eng. Chem. Res.

220

109

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A series of TiO2-, Al2O3-, and SiO2-supported manganese oxide catalysts were prepared, characterized, and catalytically tested for selective catalytic reduction (SCR) of NO with NH3 in the presence of excess oxygen at low temperatures (373−523 K). Various commercial supports were used in this study to find out the influence of surface area, support nature (acidic, basic), and crystalline phase on SCR activity. XRD studies reveal the presence of anatase and rutile phases for titania supports and the existence of γ-alumina in the case of alumina support. Silica support was amorphous. No independent lines corresponding to the crystalline MnO2 were observed on pure anatase and rutile samples. However, the presence of MnO2 was confirmed on other supports by XRD. BET surface area values suggest that specific surface area of the supports was decreased after impregnating with MnO2. The FT-IR and ammonia TPD studies indicate the presence of two types of acid sites on these catalysts, and the acidic strength of the catalysts is higher than the corresponding pure supports. XPS results revealed the presence of two types of manganese oxides, MnO2 (642.4 eV) and Mn2O3 (641.2 eV), on all the samples. The SCR performance of the supported Mn catalysts decreased in the following order: TiO2 (anatase, high surface area) > TiO2 (rutile) > TiO2 (anatase, rutile) > γ-Al2O3 > SiO2 > TiO2 (anatase, low surface area). Quantitative NO conversion with 100% N2 selectivity was achieved at 393 K with Mn supported on TiO2 (anatase). TiO2-supported MnO2 catalysts showed more promising SCR activity than Al2O3- or SiO2-supported manganese oxide catalysts. Various characterization techniques suggest that Lewis acid sites, a high surface concentration of MnO2, and redox properties are important in achieving high catalytic performance at low temperatures.

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“…Also, in the alkaline environment, the pH of each added neutralization reagent was maintained at 10.4 in order to exclude the effect of pH. In the SCR reaction, unreacted NH 3 is toxic, and at low temperature it forms NH 4 NO 3 by reacting with NO x or salts such as NH 4 HSO 4 by reacting with SO 2 in the exhaust gas, which consequently lowers the activity of the catalyst [12]. The MEA-added catalyst had the lowest NH 3 slip and the OA-added catalyst had the highest NH 3 slip at 200 o C.…”

Section: The Influence Of Ph When Preparation Of the Catalystmentioning

confidence: 99%

A study of the increase in selective catalytic reduction (SCR) activity of the V/TiO2 catalyst due to the addition of monoethanolamine (MEA)

Seo

Kim

Hong

2010

Korean J. Chem. Eng.

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Experiments were conducted to evaluate the effect of adding ethanol amine during the preparation of a V/TiO 2 catalyst to remove nitrogen oxide (NO x ) by selective catalytic reduction (SCR). The catalyst added monoethanolamine (MEA) had the highest NO x conversion among all the neutralization reagents tested, and the optimum MEA concentration was determined to be 10%. The catalyst-added MEA had a large amount of lattice oxygen, which was determined in the O 2 on/off experiment. In addition, it also displayed a high reoxidation rate in the O 2 reoxidation experiment. In the XPS analysis, the superior redox properties of the catalyst-added MEA were shown to be caused by the presence of Ti +3 , a non-stoichiometric species.

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The shell DENOX system for low temperature NOx removal

Cited by 33 publications

References 3 publications

Industrial NOx control via H2-SCR on a novel supported-Pt nanocatalyst

Industrial NOx control via H2-SCR on a novel supported-Pt nanocatalyst

Manganese Oxide Catalysts Supported on TiO₂, Al₂O₃, and SiO₂: A Comparison for Low-Temperature SCR of NO with NH₃

A study of the increase in selective catalytic reduction (SCR) activity of the V/TiO2 catalyst due to the addition of monoethanolamine (MEA)

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The shell DENOX system for low temperature NOx removal

Cited by 33 publications

References 3 publications

Industrial NOx control via H2-SCR on a novel supported-Pt nanocatalyst

Industrial NOx control via H2-SCR on a novel supported-Pt nanocatalyst

Manganese Oxide Catalysts Supported on TiO2, Al2O3, and SiO2: A Comparison for Low-Temperature SCR of NO with NH3

A study of the increase in selective catalytic reduction (SCR) activity of the V/TiO2 catalyst due to the addition of monoethanolamine (MEA)

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Product

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Manganese Oxide Catalysts Supported on TiO₂, Al₂O₃, and SiO₂: A Comparison for Low-Temperature SCR of NO with NH₃