Influence of metal oxides on the catalytic behavior of Au/Al2O3 for the selective reduction of NOx by hydrocarbons

Niakolas, Dimitrios K.; Andronikou, Ch.; Papadopoulou, Christina; Matralis, H.

doi:10.1016/j.cattod.2005.11.056

Cited by 17 publications

(17 citation statements)

References 12 publications

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“…The reduction of NO by propene in the presence of excess O 2 over mechanical mixtures of Au/Al 2 O 3 with a bulk oxide has been investigated [32]. When mixed with Au/Al 2 O 3 , MnO x and CoO x and, to a much greater extent, CeO 2 , act synergistically with this catalyst, thus greatly enhancing its SCR performance [32].…”

Section: Catalytic Conversion Of Pollutants In Automobile Emissions Umentioning

confidence: 99%

“…When mixed with Au/Al 2 O 3 , MnO x and CoO x and, to a much greater extent, CeO 2 , act synergistically with this catalyst, thus greatly enhancing its SCR performance [32]. In another study on HC-SCR of NO under diesel engine exhaust conditions, it was shown that an Au/Al 2 O 3 catalyst exhibited high activity and 100% selectivity towards the formation of N 2 in the temperature range of 300-350°C.…”

Section: Catalytic Conversion Of Pollutants In Automobile Emissions Umentioning

confidence: 99%

“…A common problem with supported Au catalysts for the HC-SCR of NO x is that the maximum efficiency can only be reached when the temperature is above 300°C [30][31][32][33]. Therefore, improvement in their low-temperature performance remains a major challenge.…”

Section: Catalytic Conversion Of Pollutants In Automobile Emissions Umentioning

confidence: 99%

“…SiO 2 or TiO 2 ) and thermally activated to produce supported mixed-metal catalysts. The resulting Au 16 Pt 16 /SiO 2 catalyst had a lightoff temperature of ∼30°C, whereas the equivalent Au 32 catalyst lighted off at ∼130°C and the equivalent Pt 32 catalyst at ∼80°C [70]. The catalytic activity of this catalyst was investigated in CO oxidation, toluene hydrogenation and the reduction of NO by propene.…”

Section: Catalytic Oxidation Of Hydrocarbonsmentioning

confidence: 99%

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Gold, an alternative to platinum group metals in automobile catalytic converters

et al. 2011

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Catalytic convertors based on the use of platinum, palladium and rhodium play a major role in the cleaning of automobile emissions. Gold, when dispersed as nano-sized particles, has demonstrated significant activity in the conversion of toxic components, including carbon monoxide, unburnt hydrocarbons and nitrogen oxides, in engine emissions and some advantages over the platinum group metals. Some research outcomes on the application of nano-sized gold for the conversion of these components are reviewed. Several key issues in relation to its performance and applicability in catalytic convertors such as low-temperature activity and thermal stability and the possibilities of substituting platinum group metals for automobile emission control with gold are discussed.

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Section: Catalytic Conversion Of Pollutants In Automobile Emissions Umentioning

confidence: 99%

Section: Catalytic Conversion Of Pollutants In Automobile Emissions Umentioning

confidence: 99%

Section: Catalytic Conversion Of Pollutants In Automobile Emissions Umentioning

confidence: 99%

Section: Catalytic Oxidation Of Hydrocarbonsmentioning

confidence: 99%

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Gold, an alternative to platinum group metals in automobile catalytic converters

et al. 2011

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“…There are some studies of these reactions by using titania and ceria as a support [16][17][18]. However, supported gold catalysts are still less studied for NO x reduction by hydrocarbons under oxidizing conditions [19][20][21][22]. An experiment with higher hydrocarbons as a reducing agent like octane was carried out for gold on alumina and titania as well [23].…”

Section: Introductionmentioning

confidence: 98%

Lean-burn NOx Reduction by Propene over Gold Supported on Alumina Catalysts Derived from the Sol–Gel Method

2010

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Gold supported on alumina catalysts were investigated for selective NO x reduction by propene. Two types of alumina, commercial and sol-gel alumina, were employed. The catalytic performance was mainly studied over the impregnated sol-gel alumina catalyst. The catalytic activity was tested under various propene and oxygen concentrations. NO x conversion and the activity window of the catalysts increased as the propene or oxygen concentration increased. The presence of water also enhanced the NO x conversion and widened the activity window of the catalysts. The sol-gel alumina supported catalysts gave much higher activity than the commercial alumina supported catalysts.

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Study of SBA-15 supported catalysts for toluene and NO removal: the effect of promoters (Co, Ni, Mn, Ce)

Chuang

Liu

Chang

et al. 2010

Reac Kinet Mech Cat

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SBA-15 materials were synthesized through the hydrothermal method. The SBA-15 prepared at the hydrothermal time of 24 h possessed a higher surface area and a good hexagonal structure, so it was used as the catalytic support in this experiment. The base metals (Cu, Co, Ni) coated on SBA-15 were prepared for toluene removal. The results revealed that the catalytic activity of Cu/SBA-15 for toluene removal was about 70% at 250 degrees C, which was the best among the three catalysts. The modification of Cu/SBA-15 by adding different transition metals (Ce, Co, Ni, Mn) to improve the removal efficiency of toluene and NO was also investigated in this study. The results indicate that the catalytic activity of Mn-Cu/SBA-15 for toluene removal was about 100% at 250 degrees C. The toluene as a reductant on the removal of NO was also determined. Furthermore, the catalytic activity of Mn-Cu/SBA-15 for NO removal can reach about 70% at 300 degrees C when toluene is used as reductant

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Influence of metal oxides on the catalytic behavior of Au/Al2O3 for the selective reduction of NOx by hydrocarbons

Cited by 17 publications

References 12 publications

Gold, an alternative to platinum group metals in automobile catalytic converters

Gold, an alternative to platinum group metals in automobile catalytic converters

Lean-burn NOx Reduction by Propene over Gold Supported on Alumina Catalysts Derived from the Sol–Gel Method

Study of SBA-15 supported catalysts for toluene and NO removal: the effect of promoters (Co, Ni, Mn, Ce)

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