Catalytic oxidation of VOCs over CNT-supported platinum nanoparticles

Joung, Hea-Jung; Kim, Jae‐Ha; Oh, Jun-Sik; You, Dong-Wook; Park, Han-Oh; Jung, Kwang‐Woo

doi:10.1016/j.apsusc.2013.11.066

Cited by 98 publications

(38 citation statements)

References 44 publications

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“…Chuang et al proposed that the inhibiting effect of moisture could be decreased when hydrophobic materials were used as catalysts (Chuang et al, 1992). But Joung et al indicated that the oxidation activity of Pt/CNT was unaffected by the moisture (Joung et al, 2014). Kwon et al (2015) revealed that the presence of moisture even resulted in the excellent activity of Pt/TiO 2 , even if oxygen was not present, ascribed to the oxidization of VOC by surface hydroxyl group from moisture.…”

Section: Moisture Effect and Catalytic Stabilitymentioning

confidence: 99%

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Performance of Ti-pillared montmorillonite supported Fe catalysts for toluene oxidation: The effect of Fe on catalytic activity

Liang

Liu

et al. 2016

Applied Clay Science

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Section: Moisture Effect and Catalytic Stabilitymentioning

confidence: 99%

“…As is well known, moisture greatly affects the catalytic performance for VOC oxidation, especially at low temperature (Joung et al, 2014). Water molecules can block the unsaturated coordination sites on catalyst surface and suppress its catalytic activity.…”

Section: Moisture Effect and Catalytic Stabilitymentioning

confidence: 99%

Performance of Ti-pillared montmorillonite supported Fe catalysts for toluene oxidation: The effect of Fe on catalytic activity

Liang

Liu

et al. 2016

Applied Clay Science

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“…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.…”

mentioning

confidence: 99%

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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“…As is well known, moisture is one of major causes of the dramatic loss of catalytic activity, especially at low temperature [65]. Water adsorbed on the catalyst is known to adsorb both associatively and dissociatively (as OH) on reduced cations and oxidize the surface, which blocks the unsaturated coordination sites on the catalyst surface and suppresses its catalytic activity [66].…”

Section: Moisture Effect and Catalytic Stabilitymentioning

confidence: 99%