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 › Academic › peer-review

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Abstract

Three types of platinum catalysts, Pt/SiO₂, Pt/γ-Al₂O₃ and Pt/ZrO₂ were examined for the oxidation of NO to NO₂ 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 - 1996

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@article{a2cb2080e8d948b694c6d3622cf902d3,

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 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.",

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

year = "1996",

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

language = "English",

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pages = "65--79",

journal = "Applied catalysis B: environmental",

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TY - JOUR

T1 - Roles of supports, Pt loading and Pt dispersion in the oxidation of NO to NO2 and of SO2 to SO3

AU - Xue, E.

AU - Seshan, K.

AU - Ross, J.R.H.

PY - 1996

Y1 - 1996

N2 - Three types of platinum catalysts, Pt/SiO2, Pt/γ-Al2O3 and Pt/ZrO2 were examined for the oxidation of NO to NO2 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 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.

U2 - 10.1016/S0926-3373(96)00034-3

DO - 10.1016/S0926-3373(96)00034-3

M3 - Article

VL - 11

SP - 65

EP - 79

JO - Applied catalysis B: environmental

JF - Applied catalysis B: environmental

SN - 0926-3373

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