New Pd/hierarchical macro-mesoporous ZrO2, TiO2 and ZrO2-TiO2 catalysts for VOCs total oxidation

Tidahy, Haingomalala Lucette; Siffert, Stéphane; Lamonier, Jean‐François; Zhilinskaya, E. A.; Aboukaı̈s, Antoine; Yuan, Zhong‐Yong; Vantomme, Aurélien; Su, Bao Lian; Canet, Xavier; Deweireld, G.

doi:10.1016/j.apcata.2006.05.020

Cited by 125 publications

(47 citation statements)

References 22 publications

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“…Very small PdO particles (easily reducible, peak at −45 °C) were detected over TiO2. A second peak appearing at 8 °C, also found for Pd/Al2O3, was attributed to the reduction of bulky PdO particles [26]. For both catalysts, Pd/TiO2 and Pd/Al2O3, decomposition of β-hydride species takes place at 60 °C (negative peak).…”

Section: Support and Catalysts Characterizationmentioning

confidence: 91%

Catalytic Oxidation of Propene over Pd Catalysts Supported on CeO2, TiO2, Al2O3 and M/Al2O3 Oxides (M = Ce, Ti, Fe, Mn)

et al. 2015

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Abstract:In the following work, the catalytic behavior of Pd catalysts prepared using different oxides as support (Al2O3, CeO2 and TiO2) in the catalytic combustion of propene, in low concentration in excess of oxygen, to mimic the conditions of catalytic decomposition of a volatile organic compound of hydrocarbon-type is reported. In addition, the influence of different promoters (Ce, Ti, Fe and Mn) when added to a Pd/Al2O3 catalyst was analyzed. Catalysts were prepared by the impregnation method and were characterized by ICP-OES, N2 adsorption, temperature-programmed reduction, temperature-programmed oxidation, X-ray diffraction, X-ray photoelectron spectroscopy and transmission electron microscopy. Catalyst prepared using CeO2 as the support was less easily reducible, due to the stabilization effect of CeO2 over the palladium oxides. Small PdO particles and, therefore, high Pd dispersion were observed for all of the catalysts, as confirmed by XRD and TEM. The addition of Ce to the Pd/Al2O3 catalysts increased the metal-support interaction and the formation of highly-dispersed Pd species. The addition of Ce and Fe improved the catalytic behavior of the Pd/Al2O3 catalyst; OPEN ACCESSCatalysts 2015, 5 672 however, the addition of Mn and Ti decreased the catalytic activity in the propene oxidation. Pd/TiO2 showed the highest catalytic activity, probably due to the high capacity of this catalyst to reoxidize Pd into PdO, as has been found in the temperature-programmed oxidation (TPO) experiments.

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Section: Support and Catalysts Characterizationmentioning

confidence: 91%

Catalytic Oxidation of Propene over Pd Catalysts Supported on CeO2, TiO2, Al2O3 and M/Al2O3 Oxides (M = Ce, Ti, Fe, Mn)

et al. 2015

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“…8). When O 2 is present in the reactant feed mixture, a portion of Pd 0 gets oxidized to active [Pd 2+ O 2− ] species [11]. Firstly, the oxidized catalyst ([Pd 2+ O 2− ]) is reduced by benzene and at the same time the benzene is oxidized to CO 2 and H 2 O.…”

Section: Catalysts Textural Properties Co 2 Desorption and Benzene Omentioning

confidence: 99%

Comprehensive investigation of Pd/ZSM-5/MCM-48 composite catalysts with enhanced activity and stability for benzene oxidation

Peng

et al. 2010

Applied Catalysis B: Environmental

108

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a b s t r a c t ZSM-5/MCM-48 composite materials with various acidities have been successfully assembled on zeolite seeds via a two-step crystallization process. The characterization results reveal that the ZSM-5 seeds are present in the framework of the resulting composite materials with its content gradually increasing with the Si/Al molar ratio, and Al atoms prefer the tetrahedral coordination in composite products. The amount of strong acid sites increases as the Si/Al molar ratio decreases, while that of weak acid sites is almost unchanged. The activity tests demonstrate that the catalytic activity of Pd-loaded ZSM-5/MCM-48 composite catalysts is much higher than that of Pd/ZSM-5 and Pd/MCM-48, and all these catalysts are active and stable in the total oxidation of benzene. Both Pd 0 and Pd 2+ are responsible for the oxidation reaction, and the catalytic activity is closely related to the support acidity, the CO 2 desorption capability and the Pd dispersion. This research thus indicates that the novel composite materials have promised as active Pd-supported catalysts in the elimination of volatile organic compound (VOCs).

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“…9). When O 2 is present in the reactant feed mixture, a portion of Pd 0 become oxidized to active [Pd 2+ O 2− ] species [64], suggesting that both the Pd 0 and Pd 2+ are responsible for the oxidation reaction. Firstly, the oxidized catalyst ([Pd 2+ O 2− ]) is reduced by benzene and at the same time the benzene is oxidized to CO 2 and H 2 O.…”

Section: Benzene Oxidation Activity and The Textural Properties Of Thmentioning

confidence: 99%

Synthesis and characterization of Pd/ZSM-5/MCM-48 biporous catalysts with superior activity for benzene oxidation

Cheng

et al. 2010

Applied Catalysis A: General

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a b s t r a c t ZSM-5/MCM-48 composite materials with different acidities and enhanced thermal stability have been synthesized via a simple and reliable in situ overgrowth method. The as-prepared biporous materials and the Pd-impregnated catalysts were systematically investigated by various techniques, including XRD, ICP-OES, N 2 adsorption/desorption, H 2 chemisorption, SEM, TEM/HRTEM, FT-IR, 27 Al MAS NMR, NH 3 -TPD, H 2 -TPR and XPS. The characterization results reveal that all composite catalysts exhibit high surface area, large pore volume and long pore diameter. The quantity of acid sites increases as the ZSM-5 additive amount increases, and Al atoms are in the tetrahedral coordination positions in composite materials. The activity tests demonstrate that all the Pd-loaded catalysts are active in the total elimination of benzene, while the catalytic activity values of Pd-loaded ZSM-5/MCM-48 composite catalysts are much higher than those of Pd/ZSM-5 or Pd/MCM-48 alone. Both Pd 0 and Pd 2+ are responsible for the oxidation reaction, and the catalytic activities are primarily related to the support acidity and the Pd dispersion. In addition, the stability of the composite catalysts also improves with an appropriate amount of ZSM-5 additives in MCM-48. This research shows that the novel Pd-loaded composite catalysts are promising materials in the elimination of VOCs.

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New Pd/hierarchical macro-mesoporous ZrO2, TiO2 and ZrO2-TiO2 catalysts for VOCs total oxidation

Cited by 125 publications

References 22 publications

Catalytic Oxidation of Propene over Pd Catalysts Supported on CeO2, TiO2, Al2O3 and M/Al2O3 Oxides (M = Ce, Ti, Fe, Mn)

Catalytic Oxidation of Propene over Pd Catalysts Supported on CeO2, TiO2, Al2O3 and M/Al2O3 Oxides (M = Ce, Ti, Fe, Mn)

Comprehensive investigation of Pd/ZSM-5/MCM-48 composite catalysts with enhanced activity and stability for benzene oxidation

Synthesis and characterization of Pd/ZSM-5/MCM-48 biporous catalysts with superior activity for benzene oxidation

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