Pd–Co based spinel oxides derived from pd nanoparticles immobilized on layered double hydroxides for toluene combustion

Zhao, Shen; Li, Kezhi; Jiang, S.M.; Li, Junhua

doi:10.1016/j.apcatb.2015.08.001

Cited by 227 publications

(99 citation statements)

References 60 publications

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“…Therefore, we preferred to assign the XRD patterns to the combination or mixture of these spinel species. The similar results were also reported in previous works ,,. Meanwhile, the average crystallite sizes of all samples were calculated by X‐ray diﬀraction with the Scherrer equation.…”

Section: Bet Surface Areas Surface Element Compositions Oxygen Amousupporting

confidence: 86%

“…Figure illustrates the XRD patterns of Al−Co spinel, Ga−Co spinel and Ga−Co sol‐gel calcined at 500 °C. For Al−Co spinel, all the peaks for Al−Co spinel between the standard peaks of AlCo 2 O 4 , Al 2 CoO 4 and Co 3 O 4 , these peaks can be indexed to the spinel oxide phases (Co 2 AlO 4 , JCPDS 38–0814; CoAl 2 O 4 , JCPDS 44–0160; Co 3 O 4 , JCPDS 74–2120) ,. All the peaks for Ga−Co spinel and Ga−Co sol‐gel are between the standard peaks of Ga 2 CoO 4 and Co 3 O 4 , which were attributed to the mixed spinel oxide phases (CoGa 2 O 4 , JCPDS 11–0698; Co 3 O 4 , JCPDS 74–2120) .…”

Section: Bet Surface Areas Surface Element Compositions Oxygen Amoumentioning

confidence: 98%

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Promotion Effect of Ga−Co Spinel Derived from Layered Double Hydroxides for Toluene Oxidation

Yang

Wang

et al. 2018

ChemCatChem

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Considering the radius similarity of Al 3 + (0.50 Å ) and Ga 3 + (0.62 Å ), AlÀCo and GaÀCo layered double hydroxides (LDH) was prepared as precursor to improve the synergetic interaction of the transition metals. The AlÀCo and GaÀCo spinel catalysts were obtained by the following calcination for the toluene oxidation. The GaÀCo (E a = 79.5 kJ mol À1 ) showed higher activity than the AlÀCo (E a = 95.4 kJ mol À1 ), and it exhibited excellent stability and resistance to carbon deposition during a 50 h reaction period at 300 8C. Characterization results indicated that the improved activity of GaÀCo spinel could be attributed to the higher reducibility (H 2 -TPR), more surface Co 3 + and adsorbed oxygen in quantity (XPS) and adsorbed toluene (Toluene-TPD) than AlÀCo spinel. Compared with traditional GaÀCo binary catalyst, the spinel structure possessed more Bsites cations outermost of the surface and surface oxygen vacancies for the toluene adsorption and ring-open reaction.

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Section: Bet Surface Areas Surface Element Compositions Oxygen Amousupporting

confidence: 86%

Section: Bet Surface Areas Surface Element Compositions Oxygen Amoumentioning

confidence: 98%

Promotion Effect of Ga−Co Spinel Derived from Layered Double Hydroxides for Toluene Oxidation

Yang

Wang

et al. 2018

ChemCatChem

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“…On the other hand, cobalt-containing materials have been found to be very efficient catalysts of the total oxidation of VOCs [5,[41][42][43][44]. Co3O4 was recognized to be the active phase, which after dispersion on the appropriate support brings about excellent catalytic performance.…”

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confidence: 99%

Cobalt-containing BEA zeolite for catalytic combustion of toluene

Rokicińska

Drozdek

Dudek

et al. 2017

Applied Catalysis B: Environmental

104

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GRAPHICAL ABSTRACT Highlights-Controlled amounts of cobalt were homogeneously introduced in BEA structure.-Various forms of Co species were identified in Co-containing BEA structure.-After saturation of framework sites Co formed oxide clusters and crystallites.-The presence of Lewis acid sites resulted in enhanced selectivity to CO and benzene.-The highest activity showed Co-containing SiBEA with dominant contribution of Co3O4. AbstractCo-containing HAlBEA zeolite was obtained by conventional wet impregnation of HAlBEA zeolite with an aqueous Co(NO3)2 . 6 H2O solution, whereas Co-containing SiBEA zeolites were prepared by a two-step post-synthesis method. This approach consists of, in the first step, dealumination of parent BEA zeolite to obtain an aluminum-free SiBEA support and then, in the subsequent step, contact of the obtained material with an aqueous solution of cobalt nitrate. As shown by X-ray diffraction and low-temperature N2 adsorption, the dealumination of BEA zeolite and introduction of cobalt ions did not involve destruction of zeolite structure, and only insignificant blocking of pore system was observed after introduction of high amounts of cobalt. Nevertheless, clear changes in acidity were found by FTIR of pre-adsorbed pyridine after dealumination of parent BEA zeolite and introduction of cobalt ions. The presence of Lewis acid sites resulted in enhanced selectivity to CO and benzene formed as by-products in the toluene combustion. Therefore, SiBEA zeolite was chosen as a support for an introduction of various amounts of Co into the zeolite structure (the intended Co contents of 3.0 -9.0 wt %). Depended on the amount of the introduced Co, cobalt was incorporated into the framework of BEA zeolite as isolated mononuclear Co(II) species, small Co(II) oxide clusters and/or Co3O4 crystallites distributed in the whole zeolite structure.The chemical environment and dispersion of cobalt species were studied by transmission electron microscopy (TEM), FTIR of pre-adsorbed NO, UV-vis diffuse reflectance spectroscopy and X-ray photoelectron spectroscopy (XPS). Temperature-programmed reduction of hydrogen (H2-TPR) was also performed to determine reducibility of the Cocontaining SiBEA zeolites. It was confirmed that siliceous SiBEA zeolite was the excellent support of Co3O4, which was in turn recognized as the main active phase in the total oxidation of toluene. The best catalytic performance was achieved over the catalysts containing at least 0.05 mmol of Co in the form of Co3O4 per 1 g of SiBEA zeolite.

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“…Furthermore, the variation (red shift) in the Raman band of PdO in the PdÀ GaO x /Al 2 O 3 sample as compared to that in the Pd/Al 2 O 3 sample could be associated with the structure disorder induced by the minor phases in the sample or the non-stoichiometry induced by oxygen deficiency. [51] Interestingly, we find that the hydrothermal treatment of the dual metal catalyst was also important for stabilizing the active component.…”

Section: Discussionmentioning

confidence: 83%

Highly Active and Stable Pd−GaO_x/Al₂O₃ Catalysts Derived from Intermetallic Pd₅Ga₃ Nanocrystals for Methane Combustion

et al. 2018

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Catalytic combustion of methane is widely used in industrial and transportation activities. The commonly used Pd‐based catalysts, however, are easily deactivated under hydrothermal conditions. In this work, we adopted a novel strategy to prepare a GaOx‐doped Pd/Al2O3 catalyst via the oxidative transformation of intermetallic Pd5Ga3 nanocrystals supported on γ‐Al2O3. We observed a synergistic effect between palladium and gallium oxide via formation of a bi‐functional active Pd−O−Ga phase, resulting in a highly active and exceptionally stable catalyst that could markedly suppress the sintering of noble metals under harsh conditions (hydrothermal treatment at 750 °C). Moreover, the presence of a large amount of surface oxygen vacancies and the surface Pd−O−Ga phase could promote methane combustion over the catalysts. It is believed that such a novel dual‐metal catalyst is promising in practical applications for methane combustion.

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Pd–Co based spinel oxides derived from pd nanoparticles immobilized on layered double hydroxides for toluene combustion

Cited by 227 publications

References 60 publications

Promotion Effect of Ga−Co Spinel Derived from Layered Double Hydroxides for Toluene Oxidation

Promotion Effect of Ga−Co Spinel Derived from Layered Double Hydroxides for Toluene Oxidation

Cobalt-containing BEA zeolite for catalytic combustion of toluene

Highly Active and Stable Pd−GaO_x/Al₂O₃ Catalysts Derived from Intermetallic Pd₅Ga₃ Nanocrystals for Methane Combustion

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Pd–Co based spinel oxides derived from pd nanoparticles immobilized on layered double hydroxides for toluene combustion

Cited by 227 publications

References 60 publications

Promotion Effect of Ga−Co Spinel Derived from Layered Double Hydroxides for Toluene Oxidation

Promotion Effect of Ga−Co Spinel Derived from Layered Double Hydroxides for Toluene Oxidation

Cobalt-containing BEA zeolite for catalytic combustion of toluene

Highly Active and Stable Pd−GaOx/Al2O3 Catalysts Derived from Intermetallic Pd5Ga3 Nanocrystals for Methane Combustion

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Highly Active and Stable Pd−GaO_x/Al₂O₃ Catalysts Derived from Intermetallic Pd₅Ga₃ Nanocrystals for Methane Combustion