The Activities of NO Oxidation over the Pt/γ-Al2O3 Catalyst

Pt catalysts were prepared by incipient wetness impregnation,It was investigated that the effects of the support and the loading of Pt on the activities of NO oxidation over supported Pt catalysts, The investigation indicates that Pt/γ-Al2O3 was better performance than Pt/ZrO2, Pt/CeO2, Pt/TiO2 and Pt/Ce0.4Zr0.6O2 on NO oxidation.The optimal Pt loading over Pt/r-Al2O3 was 1%, the NO conversion efficiency of 54.9% at 300°C, close to the conversion rate of thermodynamic equilibrium of the NO oxidation reaction.

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A kinetic and DRIFTS study of supported Pt catalysts for NO oxidation

Catalysis Letters ◽

10.1007/s10562-006-0100-4 ◽

2006 ◽

Vol 110 (1-2) ◽

pp. 29-37 ◽

Cited By ~ 42

Author(s):

Yaying Ji ◽

Todd J. Toops ◽

Uschi M. Graham ◽

Gary Jacobs ◽

Mark Crocker

Keyword(s):

No Oxidation ◽

Pt Catalysts ◽

Supported Pt Catalysts

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Co-precipitation Synthesized MnOx-CeO2 Mixed Oxides for NO Oxidation and Enhanced Resistance to Low Concentration of SO2 by Metal Addition

Catalysts ◽

10.3390/catal9060519 ◽

2019 ◽

Vol 9 (6) ◽

pp. 519 ◽

Cited By ~ 3

Author(s):

Jiaming Shao ◽

Fawei Lin ◽

Yan Li ◽

Hairong Tang ◽

Zhihua Wang ◽

...

Keyword(s):

Calcination Temperature ◽

Conversion Efficiency ◽

Mixed Oxides ◽

No Oxidation ◽

Precipitation Method ◽

No Conversion ◽

So2 Poisoning ◽

Negative Effect ◽

Co Precipitation ◽

Metal Addition

NO oxidation was conducted over MnOx-CeO2 catalysts, which were synthesized by the co-precipitation method. The calcination temperature and third metal doping were the main considerations. MnCe catalysts calcined at 350 °C and 450 °C attained the highest NO conversion efficiency, compared to 550 °C. XRD results suggested that the higher the calcination temperature, the higher the crystallization degree, which led to a negative effect on catalytic activity. Subsequently, Sn, Fe, Co, Cr, and Cu were separately doped into MnCe composites, but no improvement was observed for these trimetallic catalysts in NO conversion. Nevertheless, MnCeSn, MnCeFe, and MnCeCo still exhibited a desirable NO conversion efficiency, so they were tested under SO2 addition together with MnCe catalyst. Among them, MnCeFe exhibited the highest NO conversion after whole poisoning testing. XPS results indicated that Fe could protect Mn and Ce metal oxides from being reduced during SO2 poisoning process. Furthermore, in in-situ DRIFTS measurement, part of nitrate species maintained undestroyed on the MnCeFe catalyst surface after SO2 poisoning. These characteristics reinforced that Fe dropping would achieve better performance under SO2 atmosphere.

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Enhanced methanol oxidation and CO tolerance using oxygen-passivated molybdenum phosphide/carbon supported Pt catalysts

Journal of Materials Chemistry A ◽

10.1039/c6ta01319h ◽

2016 ◽

Vol 4 (20) ◽

pp. 7674-7682 ◽

Cited By ~ 31

Author(s):

Yaqiang Duan ◽

Ye Sun ◽

Lei Wang ◽

Ying Dai ◽

Baibing Chen ◽

...

Keyword(s):

Methanol Oxidation ◽

Oxidation Reaction ◽

Catalyst Supports ◽

Methanol Oxidation Reaction ◽

Pt Catalysts ◽

Co Tolerance ◽

Supported Pt Catalysts ◽

Molybdenum Phosphide ◽

Kinetics Of

To improve the sluggish kinetics of the methanol oxidation reaction (MOR), one efficient way is to improve the properties of catalyst supports to enhance the activity and durability of Pt-based catalysts.

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A transient in situ infrared spectroscopy study on methane oxidation over supported Pt catalysts

Catalysis Science & Technology ◽

10.1039/c4cy00486h ◽

2014 ◽

Vol 4 (10) ◽

pp. 3463-3473 ◽

Cited By ~ 15

Author(s):

Sheedeh Fouladvand ◽

Magnus Skoglundh ◽

Per-Anders Carlsson

Keyword(s):

Incipient Wetness Impregnation ◽

Pt Catalysts ◽

X Ray Diffraction ◽

Total Oxidation ◽

X Ray ◽

Oxidation Of Methane ◽

Transmission Electron ◽

Supported Pt Catalysts ◽

In Situ Infrared Spectroscopy

Catalysts with platinum dispersed on alumina, ceria and mixed alumina–ceria have been prepared by incipient wetness impregnation, characterized with transmission electron microscopy and X-ray diffraction, and evaluated for total oxidation of methane under both stationary and transient gas compositions (oxygen pulsing).

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Carbon nanotubes-supported Pt catalysts for decalin dehydrogenation to release hydrogen: A comparison between nitrogen- and oxygen-surface modification

International Journal of Hydrogen Energy ◽

10.1016/j.ijhydene.2020.09.225 ◽

2021 ◽

Vol 46 (1) ◽

pp. 930-942

Author(s):

Yongxiao Tuo ◽

Liu Yang ◽

Xuefei Ma ◽

Zhejie Ma ◽

Shan Gong ◽

...

Keyword(s):

Carbon Nanotubes ◽

Surface Modification ◽

Pt Catalysts ◽

Supported Pt Catalysts ◽

Oxygen Surface

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Influence of the Reduction Temperature and the Nature of the Support on the Performance of Zirconia and Alumina-Supported Pt Catalysts for n-Dodecane Hydroisomerization

Catalysts ◽

10.3390/catal11010088 ◽

2021 ◽

Vol 11 (1) ◽

pp. 88

Author(s):

Diana García-Pérez ◽

Maria Consuelo Alvarez-Galvan ◽

Jose M. Campos-Martin ◽

Jose L. G. Fierro

Keyword(s):

Catalytic Activity ◽

Surface Area ◽

Catalytic Properties ◽

Catalytic Performance ◽

Major Influence ◽

Pt Catalysts ◽

Reduction Temperature ◽

Metal Dispersion ◽

Tungsten Oxides ◽

Supported Pt Catalysts

Catalysts based on zirconia- and alumina-supported tungsten oxides (15 wt % W) with a small loading of platinum (0.3 wt % Pt) were selected to study the influence of the reduction temperature and the nature of the support on the hydroisomerization of n-dodecane. The reduction temperature has a major influence on metal dispersion, which impacts the catalytic activity. In addition, alumina and zirconia supports show different catalytic properties (mainly acid site strength and surface area), which play an important role in the conversion. The NH3-TPD profiles indicate that the acidity in alumina-based catalysts is clearly higher than that in their zirconia counterparts; this acidity can be attributed to a stronger interaction of the WOx species with alumina. The PtW/Al catalyst was found to exhibit the best catalytic performance for the hydroisomerization of n-dodecane based on its higher acidity, which was ascribed to its larger surface area relative to that of its zirconia counterparts. The selectivity for different hydrocarbons (C7–10, C11 and i-C12) was very similar for all the catalysts studied, with branched C12 hydrocarbons being the main products obtained (~80%). The temperature of 350 °C was clearly the best reduction temperature for all the catalysts studied in a trickled-bed-mode reactor.

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