Deactivation of V2O5/TiO2 catalysts during the oxidation of meta-dichlorobenzene in the presence of methyl-naphthalene

Lichtenberger, Janine; Amiridis, Michael D.

doi:10.1016/j.cattod.2004.08.001

Cited by 18 publications

(8 citation statements)

References 31 publications

(35 reference statements)

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“…Similar to the adsorption of naphthoic acid onto iron oxide [29], the weaker shoulders at 1540 cm -1 and 1400 cm -1 have been assigned to a surface naphthoate species. A similar assignment can be made in our case as well, with such a naphtholate species representing one of the modes of adsorption of naphthalene on CeO 2 and at the same time, the first step towards oxidation, as we suggested previously for benzoate species [26]. In addition, weak peaks at 1783 cm -1 and 1717 cm -1 have been previously assigned to phthalic anhydride [26] and dimethyl phthalate [30] species, respectively.…”

Section: Discussionsupporting

confidence: 71%

“…A similar assignment can be made in our case as well, with such a naphtholate species representing one of the modes of adsorption of naphthalene on CeO 2 and at the same time, the first step towards oxidation, as we suggested previously for benzoate species [26]. In addition, weak peaks at 1783 cm -1 and 1717 cm -1 have been previously assigned to phthalic anhydride [26] and dimethyl phthalate [30] species, respectively. Phthalate vibrations are also associated with the weak peaks at 1506, 1149, and 1082 cm -1 [26,31].…”

Section: Discussionsupporting

confidence: 71%

“…In addition, weak peaks at 1783 cm -1 and 1717 cm -1 have been previously assigned to phthalic anhydride [26] and dimethyl phthalate [30] species, respectively. Phthalate vibrations are also associated with the weak peaks at 1506, 1149, and 1082 cm -1 [26,31]. Finally, well resolved peaks in the CH region (Fig.…”

Section: Discussionmentioning

confidence: 97%

“…Very weak peaks are also present at 1788 and 1690 cm -1 and can be assigned to partial oxidation products. More specifically, the peak at 1788 cm -1 is probably associated with an anhydride type species [26,27], while the peak at 1690 cm -1 can be assigned to a naphthoquinone-type species [26].…”

Section: Discussionmentioning

confidence: 97%

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Ceria and Gold/Ceria Catalysts for the Abatement of Polycyclic Aromatic Hydrocarbons: An In Situ DRIFTS Study

et al. 2009

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Gold catalysts supported on nano-crystalline ceria prepared by deposition precipitation have been characterised and tested for the total oxidation of naphthalene. Two different precipitation methods were used to prepare the nano-crystalline ceria supports and it was observed that although both supports were active materials for naphthalene oxidation, ceria synthesized by homogeneous precipitation with urea was markedly more active than CeO 2 precipitated by carbonate. The addition of gold to both active CeO 2 catalysts resulted in different effects for the total oxidation of naphthalene. Gold addition promotes the naphthalene conversion to CO 2 when ceria is prepared by precipitation with carbonates, whilst the light off temperature is shifted towards higher temperatures when gold is added to ceria synthesized by the urea method. This behaviour has been related to a change in the support characteristics and a removal of the carbonate surface species, when gold is deposited onto the ceria support.

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Section: Discussionsupporting

confidence: 71%

Section: Discussionsupporting

confidence: 71%

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 97%

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Ceria and Gold/Ceria Catalysts for the Abatement of Polycyclic Aromatic Hydrocarbons: An In Situ DRIFTS Study

et al. 2009

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“…Ex-situ IR analysis show that both the C−H aliphatic stretch at ∼2930 cm −1 and the C−O stretch centered at ∼1100 cm −1 disappear over this temperature range (between 220 and 410 °C), indicating that both blocks of the template pyrolyze in this regime. However, at 410 °C, new bands appear around 1615, 1550, and 1415 cm −1 (Supporting Information), indicating formation of intermediate species, possibly coke-like conjugated carbonaceous species or carboxylates . The presence of intermediate carbonaceous species has been observed in TGA-MS analysis of bulk mesoporous silica materials with some templates and, here, can explain the increase in the composite index of refraction as densification occurs while porosity generation is limited by slow removal of these species.…”

Section: Resultsmentioning

confidence: 53%

Pyrolysis, Crystallization, and Sintering of Mesostructured Titania Thin Films Assessed by in Situ Thermal Ellipsometry

et al. 2008

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In-situ thermal ellipsometric analysis is used to elucidate new and fine-scale details on the thermally driven densification, pyrolysis, crystallization, and sintering of dense and ordered mesoporous titania thin films prepared by evaporation-induced self-assembly. The role of the heating schedule, initial film thickness, nature of the substrate and templating agent, solution aging, and presence of water and other additives in the calcination environment is examined. Each of these parameters is shown to have unique and often substantial effects on the final film structure, while the technique itself provides detailed insight into the chemical origin and evolution of these effects. In-situ monitoring and control over the governing chemical processes, such as high-temperature adsorption phenomena that impact nanocrystal growth, is also demonstrated. The evolution of both the porosity and chemical processes occurring inside these materials are evaluated, including extraction of kinetic parameters for the pyrolysis of the template and crystallization of the matrix walls. The latter is shown to be strongly dependent on the presence of mesoscale ordering with ordered cubic films indicating a 1D diffusion-limited crystallization process and dense films following a 3D diffusion-limited process. Less well-ordered mesoporous films, despite similarities in pore volume and pore size distributions, are kinetically more reminiscent of dense films in terms of crystallization. In-situ thermal ellipsometry, by detailing the evolution of the thermally driven chemistry and ceramization that dictate the final film properties, provides immensely important insight into the synthesis and optimization of advanced functional materials based on titania and other metal oxide thin films.

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Catalytic oxidation of 1,2-DCBz over V2O5/TiO2-CNTs: effect of CNT diameter and surface functional groups

Wang

Peng

et al. 2016

Environ Sci Pollut Res

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A series of VO/TiO-carbon nanotube (CNT) catalysts were prepared and tested to decompose gaseous 1,2-dichlorobenzene (1,2-DCBz). Several physicochemical methods, including nitrogen adsorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and H temperature-programmed reduction (TPR) were employed to characterise their physicochemical properties. To better understand the effect of CNT properties on the reactivity of VO/TiO-CNT catalysts, the 1,2-DCBz residue remaining in the off-gas and on the catalyst surface were both collected and analysed. The results indicate that the outer diameter and the surface functional groups (hydroxide radical and carboxyl) of CNTs significantly influence upon the catalytic activity of CNT-containing VO/TiO catalysts: the CNT outer diameter mainly affects the aggregation of CNTs and the π-π interaction between the benzene ring and CNTs, while the introduction of -OH and -COOH groups by acid treatment can further enlarge specific surface area (SSA) and contribute to a higher average oxidation state of vanadium (V ) and supplemental surface chemisorbed oxygen (O). In addition, the enhanced mobility of lattice oxygen (O also improves the oxidation ability of the catalysts.

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Deactivation of V2O5/TiO2 catalysts during the oxidation of meta-dichlorobenzene in the presence of methyl-naphthalene

Cited by 18 publications

References 31 publications

Ceria and Gold/Ceria Catalysts for the Abatement of Polycyclic Aromatic Hydrocarbons: An In Situ DRIFTS Study

Ceria and Gold/Ceria Catalysts for the Abatement of Polycyclic Aromatic Hydrocarbons: An In Situ DRIFTS Study

Pyrolysis, Crystallization, and Sintering of Mesostructured Titania Thin Films Assessed by in Situ Thermal Ellipsometry

Catalytic oxidation of 1,2-DCBz over V2O5/TiO2-CNTs: effect of CNT diameter and surface functional groups

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