Pd and PdAu on mesoporous silica for methane oxidation: Effect of SO2

Venezia, Anna Maria; Murania, R.; Pantaleo, G.; Deganello, G.

doi:10.1016/j.jcat.2007.07.013

Cited by 48 publications

(36 citation statements)

References 32 publications

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“…The monometallic palladium catalysts were characterized by Pd 3d 5/2 BE of 337.1 ± 0.1 eV typical of Pd 2+ . A significant binding energy shift to 337.6 ± 0.2 eV occurred in the case of the bimetallic Pd-Au samples [16]. As already observed, concerning the Ce oxidation state, all the samples contained Ce 4+ with a minor percentage of Ce 3+ ions, some of which due to X-ray beam induced reduction during the XPS analyses [30].…”

Section: Sample Characterizationsupporting

confidence: 60%

“…The X-ray photoelectron spectroscopy (XPS) analyses were performed with a VG Microtech ESCA 3000 Multilab (VG Scientific, Sussex, UK), equipped with a dual Mg/Al anode following the same experimental procedure as before [16]. The constant charging of the samples was removed by referencing all the energies to the C 1s set at 285.1 eV, arising from the adventitious carbon.…”

Section: Sample Characterizationmentioning

confidence: 99%

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Effect of Y Modified Ceria Support in Mono and Bimetallic Pd–Au Catalysts for Complete Benzene Oxidation

et al. 2018

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Mono metallic and bimetallic Pd (1 wt. %)-Au (3 wt. %) catalysts were prepared using two ceria supports doped with 1 wt. % Y 2 O 3 . Yttrium was added by impregnation or co-precipitation. The catalyst synthesis was carried out by deposition-precipitation method, with sequential deposition-precipitation of palladium over previously loaded gold in the case of the bimetallic samples. The obtained materials, characterized by X-ray powder diffraction (XRD), High resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), and temperature programmed reduction (TPR) techniques, were tested in the complete benzene oxidation (CBO). The results of the characterization analyses and the catalytic performance pointed to a close relationship between structural, redox, and catalytic properties of mono and bimetallic catalysts. Among the monometallic systems, Pd catalysts were more active as compared to the corresponding Au catalysts. The bimetallic systems exhibited the best combustion activity. In particular, over Pd-Au supported on Y-impregnated ceria, 100% of benzene conversion towards total oxidation at the temperature of 150 • C was obtained. Comparison of surface sensitive XPS results of fresh and spent catalysts ascertained the redox character of the reaction.

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Section: Sample Characterizationsupporting

confidence: 60%

Section: Sample Characterizationmentioning

confidence: 99%

Effect of Y Modified Ceria Support in Mono and Bimetallic Pd–Au Catalysts for Complete Benzene Oxidation

et al. 2018

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“…Characterizations by specific surface area measurements (BET method), and X-ray photoelectron spectroscopy (XPS) were also performed. Details on the characterization techniques are reported elsewhere [13,14,21]. In order to investigate the sulphur poisoning XPS and FT-IR measurements were also carried out on the aged catalysts.…”

Section: Methodsmentioning

confidence: 99%

“…The rate of PdO sulphation leading to inactive PdSO 4 species was found to depend on the nature of the support, being a sulphating or non-sulphating oxide [6,8,[10][11][12][13][14]. Palladium on sulphating supports, (i.e.…”

Section: Introductionmentioning

confidence: 99%

Insights into SO2 Interaction with Pd/Co3O4–CeO2 Catalysts for Methane Oxidation

Liotta

Carlo²,

Pantaleo

et al. 2009

Top Catal

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The catalytic performance and the sulphur resistance of a Pd (0.7 wt%) catalyst supported over Co 3 O 4 (30 wt%)-CeO 2 (70 wt%) mixed oxide were investigated in the oxidation of methane under stoichiometric and lean conditions. The catalytic behaviour was compared with that of two reference catalysts, palladium supported over pure Co 3 O 4 and CeO 2 . Catalysts were characterized by XRD, BET, XPS and FTIR measurements. Regeneration by a CH 4 -reducing treatment at 600°C was investigated.

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“…For example, Venezia et al [184] prepared bimetallic AuPd/HMS catalyst by co-impregnating the HMS support with aqueous solutions of the two metal chlorides, PdCl 2 and AuCl 3 , followed by a drying step at 120 °C and calcination at 400 °C for 2 h. The resulting catalysts, containing PdO nanoparticles (7 nm) and large AuNPs (18 nm), were active for methane oxidation. Li et al [185] dispersed bimetallic Au-Pd nanoparticles within monolithic mesoporous silica by immersion of the silica host into HAuCl 4 solution at room temperature.…”

Section: Incipient Wetness Impregnationmentioning

confidence: 99%

Synthesis of Gold Catalysts Supported on Mesoporous Silica Materials: Recent Developments

2011

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Mesoporous silica materials (MSM) with ordered and controllable porous structure, high surface area, pore volume and thermal stability are very suitable catalyst supports, because they provide high dispersion of metal nanoparticles and facilitate the access of the substrates to the active sites. Since the conventional wet-impregnation and deposition-precipitation methods are not appropriate for the incorporation of gold nanoparticles (AuNPs) into MSM, considerable efforts have been made to develop suitable methods to synthesize Au/MSM catalysts, because the incorporation of AuNPs into the channel system can prevent their agglomeration and leaching. In this review, we summarize the main methods to synthesize active gold catalysts supported on MSM. Examples and details of the preparative methods, as well as selected applications are provided. We expect this article to be interesting to researchers due to the wide variety of chemical reactions that can be catalyzed by gold supported catalysts.

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Pd and PdAu on mesoporous silica for methane oxidation: Effect of SO2

Cited by 48 publications

References 32 publications

Effect of Y Modified Ceria Support in Mono and Bimetallic Pd–Au Catalysts for Complete Benzene Oxidation

Effect of Y Modified Ceria Support in Mono and Bimetallic Pd–Au Catalysts for Complete Benzene Oxidation

Insights into SO2 Interaction with Pd/Co3O4–CeO2 Catalysts for Methane Oxidation

Synthesis of Gold Catalysts Supported on Mesoporous Silica Materials: Recent Developments

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