Roles of supports, Pt loading and Pt dispersion in the oxidation of NO to NO2 and of SO2 to SO3

E. Xue; K. Seshan; J. R.H. Ross

doi:10.1016/S0926-3373(96)00034-3

Roles of supports, Pt loading and Pt dispersion in the oxidation of NO to NO₂ and of SO₂ to SO₃

E. Xue, K. Seshan, J. R.H. Ross

Research output: Contribution to journal › Article › peer-review

Abstract

Three types of platinum catalysts, Pt/SiO₂, Pt/γ-Al₂O₃ and Pt/ZrO₂ were examined for the oxidation of NO to NO₂ and of SO₂ to SO₃. The activity order for both oxidation reactions was found to be: Pt/SiO₂ > Pt/γ-Al₂O₃ > Pt/ZrO₂. The effect of Pt loading and Pt dispersion on the catalytic activity and selectivity was examined. Over Pt/SiO₂, the specific activities were found to be strongly size-dependent, the larger Pt particles exhibiting higher specific activity than the smaller ones. Over the Pt/γ- Al₂O₃ catalysts, however, the size-dependence appeared to be much less significant than that of the Pt/SiO₂ catalysts. The results for Pt/ZrO₂ catalysts, however, showed that the specific activities for both reactions were most probably size independent. The catalytic selectivity for the oxidation of NO relative to that of SO₂ appeared to be size-independent for all the catalysts. The interaction of NO, NO₂ and SO₂ with the catalysts and the effect of the support on the interaction were investigated using TPD technique.

Original language	English
Pages (from-to)	65-79
Number of pages	15
Journal	Applied Catalysis B: Environmental
Volume	11
Issue number	1
DOIs	https://doi.org/10.1016/S0926-3373(96)00034-3
Publication status	Published - 27 Dec 1996

Keywords

Diesel particulate removal
Nitric oxide oxidation
Platinum/alumina
Platinum/silica
Platinum/zirconia
Sulphur dioxide oxidation

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title = "Roles of supports, Pt loading and Pt dispersion in the oxidation of NO to NO2 and of SO2 to SO3",

abstract = "Three types of platinum catalysts, Pt/SiO2, Pt/γ-Al2O3 and Pt/ZrO2 were examined for the oxidation of NO to NO2 and of SO2 to SO3. The activity order for both oxidation reactions was found to be: Pt/SiO2 > Pt/γ-Al2O3 > Pt/ZrO2. The effect of Pt loading and Pt dispersion on the catalytic activity and selectivity was examined. Over Pt/SiO2, the specific activities were found to be strongly size-dependent, the larger Pt particles exhibiting higher specific activity than the smaller ones. Over the Pt/γ- Al2O3 catalysts, however, the size-dependence appeared to be much less significant than that of the Pt/SiO2 catalysts. The results for Pt/ZrO2 catalysts, however, showed that the specific activities for both reactions were most probably size independent. The catalytic selectivity for the oxidation of NO relative to that of SO2 appeared to be size-independent for all the catalysts. The interaction of NO, NO2 and SO2 with the catalysts and the effect of the support on the interaction were investigated using TPD technique.",

keywords = "Diesel particulate removal, Nitric oxide oxidation, Platinum/alumina, Platinum/silica, Platinum/zirconia, Sulphur dioxide oxidation",

author = "E. Xue and K. Seshan and Ross, {J. R.H.}",

year = "1996",

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doi = "10.1016/S0926-3373(96)00034-3",

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AU - Xue, E.

AU - Seshan, K.

AU - Ross, J. R.H.

PY - 1996/12/27

Y1 - 1996/12/27

N2 - Three types of platinum catalysts, Pt/SiO2, Pt/γ-Al2O3 and Pt/ZrO2 were examined for the oxidation of NO to NO2 and of SO2 to SO3. The activity order for both oxidation reactions was found to be: Pt/SiO2 > Pt/γ-Al2O3 > Pt/ZrO2. The effect of Pt loading and Pt dispersion on the catalytic activity and selectivity was examined. Over Pt/SiO2, the specific activities were found to be strongly size-dependent, the larger Pt particles exhibiting higher specific activity than the smaller ones. Over the Pt/γ- Al2O3 catalysts, however, the size-dependence appeared to be much less significant than that of the Pt/SiO2 catalysts. The results for Pt/ZrO2 catalysts, however, showed that the specific activities for both reactions were most probably size independent. The catalytic selectivity for the oxidation of NO relative to that of SO2 appeared to be size-independent for all the catalysts. The interaction of NO, NO2 and SO2 with the catalysts and the effect of the support on the interaction were investigated using TPD technique.

AB - Three types of platinum catalysts, Pt/SiO2, Pt/γ-Al2O3 and Pt/ZrO2 were examined for the oxidation of NO to NO2 and of SO2 to SO3. The activity order for both oxidation reactions was found to be: Pt/SiO2 > Pt/γ-Al2O3 > Pt/ZrO2. The effect of Pt loading and Pt dispersion on the catalytic activity and selectivity was examined. Over Pt/SiO2, the specific activities were found to be strongly size-dependent, the larger Pt particles exhibiting higher specific activity than the smaller ones. Over the Pt/γ- Al2O3 catalysts, however, the size-dependence appeared to be much less significant than that of the Pt/SiO2 catalysts. The results for Pt/ZrO2 catalysts, however, showed that the specific activities for both reactions were most probably size independent. The catalytic selectivity for the oxidation of NO relative to that of SO2 appeared to be size-independent for all the catalysts. The interaction of NO, NO2 and SO2 with the catalysts and the effect of the support on the interaction were investigated using TPD technique.

KW - Diesel particulate removal

KW - Nitric oxide oxidation

KW - Platinum/alumina

KW - Platinum/silica

KW - Platinum/zirconia

KW - Sulphur dioxide oxidation

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Roles of supports, Pt loading and Pt dispersion in the oxidation of NO to NO₂ and of SO₂ to SO₃

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