The nature of activity enhancement for propane oxidation over supported Pt catalysts exposed to sulphur dioxide

Burch, Robbie; Halpin, E.; Hayes, Martin J.; Ruth, K.; Sullivan, James A.

doi:10.1016/s0926-3373(98)00079-4

Cited by 112 publications

(89 citation statements)

References 14 publications

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“…This shift evidences that metallic Pd and PdO/Pd 0 interfaces coexist, which are the active sites for the oxidation reaction (Burch et al 1998).…”

Section: Discussionmentioning

confidence: 74%

“…On the other hand, the XPS results before and after oxidation in the pre-chamber show a shift of the binding energy of Pd towards 337.2 eV, which is attributed to a higher oxidation state of palladium, according to the literature (Burch et al 1998, Guimarães et al 2003. This shift evidences that metallic Pd and PdO/Pd 0 interfaces coexist, which are the active sites for the oxidation reaction (Burch et al 1998).…”

Section: Discussionmentioning

confidence: 76%

“…Indeed, XPS and DRS results showed surface modifications after the reduction and oxidation reactions, which affected the nature of sites and the interaction of the palladium with the support, although, the dispersion was approximately equal for all precursors, with the exception of the catalyst PdCe-Cl, as shown in Table I. Burch et al (1998) observed the effect of chlorine on the palladium dispersion employing an alumina support. Indeed, during the oxidation of propane the water formation is responsible for the release of residual chlorine, re-dispersing Pd at the surface with the formation of oxy-chloride intermediates (Pd x O y Cl z ), as also observed by Schmal et al (2000) and Gaspar and Dieguez (2000).…”

Section: Discussionmentioning

confidence: 91%

See 2 more Smart Citations

The effect of precursors salts on surface state of Pd/Al2O3 and Pd/CeO2/Al2O3 catalysts

Guimarães

Dieguez

Schmal

2004

An. Acad. Bras. Ciênc.

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The influence of the precursors on the promoting effect of ceria on Pd/Al 2 O 3 catalyst, when ceria is coated over alumina was studied. The reaction of propane oxidation proceeded under different feed conditions and the surface active sites were characterized by X-ray photoelectron spectroscopy (XPS) and in situ diffuse reflectance spectroscopy (DRS).XPS and DRS results show that PdO/Pd 0 interface are the active sites independent of the precursor, while the catalysts containing CeO 2 showed formation of palladium species in the highest oxidation state, probably PdO 2 (338 eV) after the oxidation of propane. Besides, the O/Al and O/Ce ratios evidenced the increase of oxygen storage in the presence of CeO 2 . In addition, the precursor acetylacetonate favors the oxygen storage in the lattice.

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“…This shift evidences that metallic Pd and PdO/Pd 0 interfaces coexist, which are the active sites for the oxidation reaction (Burch et al 1998).…”

Section: Discussionmentioning

confidence: 74%

Section: Discussionmentioning

confidence: 76%

Section: Discussionmentioning

confidence: 91%

See 1 more Smart Citation

The effect of precursors salts on surface state of Pd/Al2O3 and Pd/CeO2/Al2O3 catalysts

Guimarães

Dieguez

Schmal

2004

An. Acad. Bras. Ciênc.

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“…This promoting effect of sulphur species on the oxidation of hydrocarbons on precious metals seems contrary to the received wisdom that sulphur always acts as a catalyst poison, but has been encountered in previous studies only in the case of Pt /Al 2 O 3 washcoats with propane oxidation [6] and methane oxidation [10]. The explanation given in [9] Table 2. Fig.…”

Section: Kinetics Of Ch 4 Oxidation On Pt Catalystsmentioning

confidence: 69%

06/02194 Kinetics of CH4, H2S and SO2 oxidation on precious metal catalysts under stagnation point flow conditions

2006

Fuel and Energy Abstracts

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A new methodology which combines reactor experiments and numerical modelling to derive kinetic rates of solid-gas heterogeneous reactions in a stagnation point flow reactor (SPFR) is developed and used to investigate the effects of small concentrations of H 2 S and SO 2 on the lean respectively. Repeated use of the washcoated catalyst add the effect of pore opening given rise to a change in the pre-exponential factor from 7.410 5 cm s -1 to 1.110 9 cm s -1 for Pt. The high temperature activity behaviour of Pt in presence of sulphur species in the feed was however superior to that of Pd, due to the changing nature of the active site in CH 4 oxidation (PdO/Pd), as is consistent with the literature based on other type of reactor studies. Methane combustion was enhanced by both H 2 S and SO 2 on the Pt catalysts as opposed to the Pd and Rh catalysts, which saw a decrease in the methane conversion.

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“…Generally SO 4 2-has been regarded as a poison for catalysts and catalytic processes 7 although recently it has been found to promote such reactions as propane combustion 8 and NO x reduction using NH 3 as a reducing agent 9 . Previous work 10 has shown that SO 4 2- …”

Section: Of 1tuesday November 30 2004mentioning

confidence: 99%

The influence of SO42- on the catalytic combustion of soot using O2 and NO/O2 mixtures over Na-promoted Al2O3 catalysts

Sullivan

Keane

Maguire

2005

Catalysis Communications

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The nature of activity enhancement for propane oxidation over supported Pt catalysts exposed to sulphur dioxide

Cited by 112 publications

References 14 publications

The effect of precursors salts on surface state of Pd/Al2O3 and Pd/CeO2/Al2O3 catalysts

The effect of precursors salts on surface state of Pd/Al2O3 and Pd/CeO2/Al2O3 catalysts

06/02194 Kinetics of CH4, H2S and SO2 oxidation on precious metal catalysts under stagnation point flow conditions

The influence of SO42- on the catalytic combustion of soot using O2 and NO/O2 mixtures over Na-promoted Al2O3 catalysts

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