On the promoting effect of the addition of ceria to platinum based alumina catalysts for VOCs oxidation

Sedjame, Henri-Joël; Fontaine, Céline; Lafaye, Gwendoline; Barbier, J.

doi:10.1016/j.apcatb.2013.07.022

Cited by 89 publications

(51 citation statements)

References 50 publications

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“…However, significantly lower activities in the VOCs combustion are achieved in their presence. The most commonly studied metal oxide catalysts include Co- [5,[22][23][24][25], Cu- [5,22,26], Mn- [5,22,25], Ce- [5,12,16,26], and Fe-containing materials [21,22]. It has been found that a suitable chosen support with controlled porosity favors high dispersion of active phase and enhanced activity in the total oxidation of VOCs [27][28].…”

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confidence: 99%

“…Noble metal-based materials (e.g. Pt [9][10][11][12][13][14][15] and Pd [16][17][18][19][20][21] dispersed on various supports, such as Al2O3 [6, 9-10, 12, 14, 17, 19-20], ZrO2 [6,19] or TiO2 [16][17][18]), are usually studied in a role of catalysts of the VOCs combustion. They exhibit very high catalytic activity at relatively low temperatures, but are expensive and prone to deactivation by sintering or poisoning.…”

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confidence: 99%

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Cobalt-containing BEA zeolite for catalytic combustion of toluene

Rokicińska

Drozdek

Dudek

et al. 2017

Applied Catalysis B: Environmental

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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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Cobalt-containing BEA zeolite for catalytic combustion of toluene

Rokicińska

Drozdek

Dudek

et al. 2017

Applied Catalysis B: Environmental

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“…The porous Al 2 O 3 -TiO 2 composites precisely make up the disadvantages of single TiO 2 because of the large surface area and strong surface acidity of Al 2 O 3 [23]. CeO 2 is a crucial component in catalysts for its role in oxygen storage, redox properties and enhancing the dispersion of noble metals and the thermal stability of catalysts which always plays the role of promoter in support [21,24].…”

Section: Introductionmentioning

confidence: 99%

“…The support properties also play an important role in the efficiency of catalysts [21]. Supports were expected to be an important component of the catalyst, since they often profoundly affected the generation of active species and the catalytic performance of Pd [12].…”

Section: Introductionmentioning

confidence: 99%

Methanol total oxidation as model reaction for the effects of different Pd content on Pd-Pt/CeO2-Al2O3-TiO2 catalysts

Guo

Zhang

et al. 2017

Molecular Catalysis

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“…Ceria has relatively large absorption and desorption properties of oxygen due to the active Ce 3+ /Ce 4+ redox pair in comparison with other metal oxides, and thus the mixing of CeO 2 to various catalysts effectively improves the combustion behavior against hydrocarbons and VOCs [44][45][46][47][48]. Among them, it was also demonstrated that the addition of CeO 2 onto Ptloaded ␥-alumina and Pt/Pd-loaded ␥-alumina largely enhanced the catalytic performance of n-butanol and acetic acid oxidation [44] and methane [45], respectively, and these findings were especially served for our study as a useful reference. Copper oxide also has relatively high oxidation activity against various VOCs, owing to the large coverage of oxygen adsorbates on the surface despite of p-type semiconductor [49][50][51].…”

Section: Introductionmentioning

confidence: 99%